Heatcraft Refrigeration Products Refrigerator H IM FL1A User Manual

FL AC Scroll  
Refrigeration Systems  
Part No. 25006901  
H-IM-FL1A  
December, 2004  
Table of Contents  
Installation and  
Operation Manual  
General Safety Information ...................................................... 2  
Inspection................................................................................. 2  
Warranty Statement.................................................................. 2  
Air Cooled Condensing Unit and Condenser Space and Location  
Requirements .................................................................. 3  
Condensing Unit Rigging and Mounting................................... 4  
Ambient Fan Cycle Control ...................................................... 4  
Condensing Unit Accessories .................................................. 5  
Suction Filters, Driers, Sight Glasses....................................... 5  
Refrigerant Oils ........................................................................ 6  
Phase Loss Monitor.................................................................. 7  
Recommended Refrigerant Piping Practices ........................... 7  
Refrigeration Pipe Supports .................................................... 7  
Suction Lines............................................................................ 8  
Suction Line Risers .................................................................. 8  
Liquid Lines .............................................................................. 8  
Evacuation and Leak Detection...............................................11  
Refrigerant Charging Instructions........................................... 12  
Field Wiring............................................................................. 12  
Check Out and Start Up ......................................................... 12  
Operational Check Out........................................................... 13  
System Balancing - Compressor Superheat .......................... 13  
System Troubleshooting Guide .............................................. 14  
Preventive Maintenance Guidelines....................................... 15  
Replacement Parts................................................................. 15  
Wiring Diagrams................................................................ 16-18  
Submittal .......................................................................... 19, 20  
Service Record....................................................................... 21  
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Space and Location Requirements for  
Air Cooled Condensing Units and Remote Condensers  
Another consideration which must be taken is that the unit should  
The most important consideration which must be taken into account  
when deciding upon the location of air-cooled equipment is the  
provision for a supply of ambient air to the condenser, and removal  
of heated air from the condensing unit or remote condenser area.  
Where this essential requirement is not adhered to, it will result in  
higher head pressures, which cause poor operation and potential  
failure of equipment. Units must not be located in the vicinity of  
steam, hot air or fume exhausts. Corrosive atmospheres require  
custom designed condensers.  
be mounted away from noise sensitive spaces and must have  
adequate support to avoid vibration and noise transmission into the  
building. Units should be mounted over corridors, utility areas, rest  
rooms and other auxiliary areas where high levels of sound are not  
an important factor. Sound and structural consultants should be  
retained for recommendations.  
Figure 1. Space and Location Requirements for Condensing Units and Remote Condensers  
Multiple Units  
Walls or Obstructions  
For units placed side by side, the minimum distance  
between units is the width of the largest unit. If units  
are placed end to end, the minimum distance between  
units is 4 feet.  
The unit should be located so that air may circulate freely  
and not be recirculated. For proper air flow and access all  
sides of the unit should be a minimum of “W” away from  
any wall or obstruction. It is preferred that this distance  
be increased whenever possible. Care should be taken  
to see that ample room is left for maintenance work  
through access doors and panels. Overhead obstructions  
are not permitted. When the unit is in an area where it  
is enclosed by three walls the unit must be installed as  
indicated for units in a pit.  
Units in Pits  
Decorative Fences  
The top of the unit should be level with the top of the pit,  
and side distance increased to “2W”.  
Fences must have 50% free area, with 1 foot undercut,  
a “W” minimum clearance, and must not exceed the  
top of unit. If these requirements are not met, unit must  
be installed as indicated for “Units in pits”.  
If the top of the unit is not level with the top of pit,  
discharge cones or stacks must be used to raise discharge  
air to the top of the pit. This is a minimum requirement.  
* “W” = Total width of the condensing unit or condenser.  
3
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Condensing Unit Rigging and Mounting  
Rigging holes are provided on all units. Caution should be  
exercised when moving these units. To prevent damage to the  
unit housing during rigging, cables or chains used must be held  
apart by spacer bars. The mounting platform or base should be  
level and located so as to permit free access of supply air.  
Figure 2. Solid Mount for Mobile or Deep  
Sump Application.  
Ground Mounting  
Concrete slab raised six inches above ground level provides a  
suitable base. Raising the base above ground level provides  
some protection from ground water and wind blown matter.  
Before tightening mounting bolts, recheck level of unit. The unit  
should in all cases be located with a clear space in all directions  
that is at a minimum, equal to the height of the unit above  
the mounting surface. A condensing unit mounted in a corner  
formed by two walls, may result in discharge air recirculation  
with resulting loss of capacity.  
Ambient Fan Cycle Control  
Roof Mounting  
This is an automatic winter control method which will maintain  
a condensing pressure within reasonable limits by cycling  
fan motors in response to outside air temperature. The  
thermostat(s) should be field adjusted to shut off the fan when  
the condensing temperature is reduced to approximately 90˚F.  
Table 2 on page 5 lists approximate settings for several system  
T.D.ʼs. These settings are approximate as they do not take into  
account variations in load.  
Due to the weight of the units, a structural analysis by a  
qualified engineer may be required before mounting. Roof  
mounted units should be installed level on steel channels or  
an I-beam frame capable of supporting the weight of the unit.  
Vibration absorbing pads or springs should be installed between  
the condensing unit legs or frame and the roof mounting  
assembly.  
Access  
Provide adequate space at the compressor end of the unit for  
servicing. Provide adequate space on the connection side to  
permit service of components.  
CAUTION: Under no circumstance should all  
condenser motors be allowed to cycle  
off on one control. At least one motor  
shall be wired to operate at all times.  
Under most circumstances, the  
Spring Mounted Compressor  
condenser motor nearest the inlet  
header should remain on whenever the  
compressor is operating.  
Compressors are secured rigidly to make sure there is no transit  
damage. Before operating the unit, it is necessary to follow  
these steps:  
a.  
b.  
c.  
Remove the upper nuts and washers.  
Discard the shipping spacers.  
Install the neoprene spacers. (Spacers located  
in the electrical panel or tied to compressor.)  
Replace the upper mounting nuts and washers.  
Allow 1/16 inch space between the mounting nut/  
washer and the neoprene spacer.  
d.  
e.  
Rigid Mounted Compressor  
Some products use rigid mounted compressors. Check the  
compressor mounting bolts to insure they have not vibrated  
loose during shipment.  
4
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Condensing Unit Accessories  
Suction Filters, Driers, Sight Glasses  
There are two types of suction and liquid filter/driers used  
on Heatcraft Refrigeration Products units. Replaceable core  
and/or sealed units are used, dependent upon the option  
package ordered.  
stream of the liquid line solenoid valve (if supplied). Liquid line  
driers may or may not have an access valve, dependent on the  
size and application. The basic servicing of these units is similar  
to suction filters. Liquid line driers should be replaced whenever  
there is evidence of excessive pressure drop across the filter,  
or the system becomes contaminated due to system leaks,  
compressor burnouts, acid formation, or moisture accumulation  
as indicated by the liquid line sight glass.  
Suction filters, regardless of type, are always installed  
upstream of the compressor suction service valve, and  
any accumulators or other options that may be installed.  
Suction filters are equipped with “Schrader” type access  
valves to allow field measurement of pressure drop across  
the device. This allows plugged filters and elements to be  
identified very quickly and easily so they can be replaced  
when the pressure drop is excessive. Refer to the specific  
manufacturersʼ recommendation on servicing these units by  
make and model.  
The sight glass is installed in the main liquid line assembly,  
downstream from the receiver outlet service valve, and  
immediately after the liquid line drier. The sight glass is  
designed to give a visual indication of moisture content in the  
system. Generally, it requires no field service. However, in  
cases of extreme acid formation in a system after a compressor  
burnout, the acid may damage the sensing element or etch the  
glass. This would require that the sight glass be replaced, along  
with the liquid line drier after any compressor motor burnout.  
Liquid filter/driers, regardless of type, are always installed  
downstream of the receiver outlet service valve, and up-  
Table 1. Recommended Low Pressure Control Settings for Outdoor Air Cooled Condensing Units  
R-22  
R-404A/R-507  
Cut-In Cut-Out  
R-134a  
Cut-Out  
*Minimum  
Cut-In  
PSI  
70  
Cut-Out  
Cut-In  
PSI  
45  
Temp. ˚F  
50  
PSI  
20  
20  
20  
10  
0
PSI  
90  
70  
55  
45  
25  
20  
12  
8
PSI  
35  
35  
35  
25  
7
PSI  
15  
10  
10  
0
40  
55  
35  
30  
40  
25  
10  
30  
13  
0
15  
8
0
-10  
-20  
-30  
15  
0
1
---  
---  
---  
---  
10  
0
1
---  
6
0
1"Hg.  
---  
* Minimum ambient or box temperature anticipated, Hi pressure control setting: R-22, 360 PSI; R-404A, R-507, 400 PSI; R-134a, 225 PSI.  
Table 2. Thermostat Settings  
Design  
Thermostat Settings  
T2  
Models  
T.D.  
30  
25  
20  
15  
30  
25  
20  
15  
30  
25  
20  
15  
T1  
60  
65  
70  
75  
60  
65  
70  
75  
60  
65  
70  
75  
T3  
2-fan units:  
4-fan units:  
3-fan units:  
6-fan units:  
8-fan units:  
40  
55  
60  
65  
50  
55  
65  
70  
30  
40  
50  
60  
NOTE: Cycle pairs of fans on double wide units.  
CAUTION:  
Fans closest to the headers should not be  
cycled on standard temperature or pressure  
controls. Dramatic temperature and pressure  
changes at the headers as a result of fan action  
can result in possible tube failure. Fan motors are  
designed for continuous duty operation.  
Fan cycling controls should be adjusted to maintain a minimum  
of (5) minutes on and (5) minutes off. Short cycling of fans may  
result in a premature failure of motor and/or fan blade.  
Compressors operating below +10°F SST must have air flowing  
over the compressor at all times when the compressor is  
running.  
5
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Refrigeration Oils*  
Color  
With the changes that have taken place in our industry due to  
the CFC issue, we have reevaluated our lubricants to ensure  
compatibility with the new HFC refrigerants and HCFC interim  
blends offered by several chemical producers. As a secondary  
criteria, it is also desirable that any new lubricant be compatible  
with the traditional refrigerants such as CFC-12, HCFC-22 or  
As received, the POE lubricant will be clear or straw colored.  
After use, it may acquire a darker color. This does not indicate  
a problem as the darker color merely reflects the activity of the  
lubricantʼ s protective additive.  
Oil Level  
R502. This “backward compatibility” has been achieved with the During Copelandʼ s testing of Polyol ester oil, it was found that  
introduction of the Polyol ester lubricants.  
this lubricant exhibits a greater tendency to introduce oil into the  
cylinder during flooded start conditions. If allowed to continue,  
this condition will cause mechanical failure of the compressor.  
Table 3 below summarizes which oils/lubricants are approved  
for use in Copeland compressors:  
A crankcase heater is required with condensing units and it  
must be turned on several hours before start-up.  
Polyol Ester Lubricants  
Oil level must not exceed 1/4 sight glass.  
Hygroscopicity  
Ester lubricants (POE) have the characteristic of quickly  
absorbing moisture from the ambient surroundings. This is  
shown graphically in Figure 3 where it can be seen that such  
lubricants absorb moisture faster and in greater quantity than  
conventional mineral oils. Since moisture levels greater than  
100 ppm will results in system corrosion and ultimate failure, it  
is imperative that compressors, components, containers and the  
entire system be kept sealed as much as possible. Lubricants  
will be packaged in specially designed, sealed containers.  
After opening, all the lubricant in a container should be used at  
once since it will readily absorb moisture if left exposed to the  
ambient. Any unused lubricant should be properly disposed of.  
Similarly, work on systems and compressors must be carried  
out with the open time as short as possible. Leaving the system  
or compressor open during breaks or overnight MUST BE  
AVOIDED!  
Figure 3.  
Mineral Oil  
Table 3. Refrigeration Oils  
Interims  
Traditional Refrigerants R401A, R401B, R402A  
HFCʼs  
HFC-134a,  
R404A, R507  
Refrigeration Oils  
Mobil EAL ARCTIC 22 CC  
ICI (Virginia KMP) EMKARATE RL 32CF  
Suniso 3GS  
HCFC-22  
A
(MP-39, MP-66, HP-80)  
A
POEʼs  
P
P
A
A
P
P
P
PM  
PM  
PM  
Mineral  
Oils  
Texaco WF32  
NOT  
ACCEPTABLE  
Calumet RO15 (Witco)  
Sontex 200-LT (White Oil)  
Witco LP-200  
(BR & Scroll Only)  
P
A/B  
Zerol 200TD  
Soltex Type AB-200  
AM  
PM  
PM  
NOT  
ACCEPTABLE  
P = Preferred Lubricant Choice A = Acceptable Alternative M = Mixture of Mineral Oil and Alkyl Benzene (AB) with minimum 50% AB.  
* (Reprinted with permission from Copeland)  
Mineral Oils  
of the traditional refrigerants or interim blends and are  
compatible with mineral oils. They can therefore be mixed  
with mineral oils when used in systems with CFC or HCFC  
refrigerants. These lubricants are compatible with one another  
and can be mixed.  
The BR and Scroll compressors use Sontex 200, a “white oil”.  
This oil is not suitable for low temperature applications nor is  
it available through the normal refrigeration wholesalers. For  
field “top-off” the use of 3GS or equivalent, or Zerol 200TD  
is permissible, as long as at least 50% of the total oil charge  
remains Sontex 200.  
Alkyl Benzenes  
Suniso 3GS, Texaco WF32 and Calumet R015 (yellow oils) are  
available through normal refrigeration wholesalers. These oils  
are compatible if mixed and can be used on both high and low  
temperature systems.  
Zerol 200TD is an alkyl benzene (AB) lubricant. Copeland  
recommends this lubricant for use as a mixture with mineral oil  
(MO) when using the interim blends such as R-401A, R-401B  
and R-402A (MP39, MP66 and HP80). A minimum of 50% AB is  
required in these mixtures to assure proper oil return.  
Polyol Ester Lubricants  
The Mobil EALARCTIC 22 CC is the preferred Polyol ester due to  
unique additives included in this lubricant. ICI Emkarate RL 32S is  
an acceptable Polyol ester lubricant approved for use when Mobil  
isnotavailable.ThesePOEʼsmustbeusedifHFCrefrigerantsare  
used in the system. They are also acceptable for use with any  
Shell MS 2212 is a 70/30 mixture of AB/MO. If this lubricant is  
used in a retrofit situation virtually all of the existing MO must be  
drained prior to refilling with the MS 2212 to assure a minimum  
50% AB content.  
6
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Phase Loss Monitor  
Refrigerant Pipe Support  
The combination phase sequence and loss monitor relay  
protects the system against phase loss (single phasing), phase  
reversal (improper sequence) and low voltage (brownout).  
When phase sequence is correct and full line voltage is present  
on all three phases, the relay is energized as the normal  
condition indicator light glows.  
1. Normally, any straight run of tubing must be supported  
in at least two locations near each end of the run. Long  
runs require additional supports. The refrigerant lines  
should be supported and fastened properly. As a guide,  
3/8 to 7/8 should be supported every 5 feet; 1-1/8 and  
1-3/8 every 7 feet; and 1-5/8 and 2-1/8 every 9 to 10  
feet.  
NOTE: If compressor fails to operate and the normal condition  
indicator light on the phase monitor does not glow, then the  
supplied electrical current is not in phase with the monitor. This  
problem is easily corrected by the following steps:  
2. When changing directions in a run of tubing, no corner  
should be left unsupported. Supports should be placed a  
maximum of 2 feet in each direction from the corner.  
1. Turn power off at disconnect switch.  
2. Swap any two of the three power input wires.  
3. Turn power on. Indicator light should glow and  
compressor should start.  
3. Piping attached to a vibrating object (such as a  
compressor or compressor base) must be supported  
in such a manner that will not restrict the movement  
of the vibrating object. Rigid mounting will fatigue the  
copper tubing.  
4. Observe motors for correct rotation.  
Recommended Refrigerant Piping Practices  
4. Do not use short radius ells. Short radius elbows have  
points of excessive stress concentration and are subject  
to breakage at these points.  
The system as supplied by Heatcraft Refrigeration Products,  
was thoroughly cleaned and dehydrated at the factory. Foreign  
matter may enter the system by way of the evaporator to  
condensing unit piping. Therefore, care must be used during  
installation of the piping to prevent entrance of foreign matter.  
5. Thoroughly inspect all piping after the equipment  
is in operation and add supports wherever line vibration  
is significantly greater than most of the other piping.  
Extra supports are relatively inexpensive as compared  
to refrigerant loss.  
Install all refrigeration system components in accordance with  
applicable local and national codes and in conformance with  
good practice required for the proper operation of the system.  
The interconnecting pipe size is not necessarily the same size  
as the stub-out on the condensing unit or the evaporator.  
Figure 4. Example of Pipe Support  
The following procedures should be followed:  
(a) Do not leave dehydrated compressors or filter-driers on  
condensing units open to the atmosphere any longer  
than is absolutely necessary.  
(b) Use only refrigeration grade copper tubing, properly  
sealed against contamination.  
(c) Suction lines should slope 1/4" per 10 feet towards the  
compressor.  
Figure 5. Condensing Unit / Compressor to Wall Support.  
(d) Suitable P-type oil traps should be located at the base of  
each suction riser of four (4) feet or more to enhance oil  
return to the compressor.  
(e) For desired method of superheat measurement,  
a pressure tap should be installed in each evaporator  
suction line in the proximity of the expansion valve bulb.  
(f) When brazing refrigerant lines, an inert gas should  
be passed through the line at low pressure to  
prevent scaling and oxidation inside the tubing.  
Dry nitrogen is preferred.  
(g) Use only a suitable silver solder alloy on suction and  
liquid lines.  
(h) Limit the soldering paste or flux to the minimum  
required to prevent contamination of the solder  
joint internally. Flux only the male portion of the  
connection, never the female. After brazing, remove  
excess flux.  
(i) If isolation valves are installed at the evaporator, full port  
ball valves should be used.  
7
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Suction Lines  
Suction Line Risers  
NOTE: If the suction line must rise to a point  
higher than the suction connection on the  
evaporator, a suction line trap at the outlet  
of the evaporator must be provided.  
Prefabricated wrought copper traps are available, or a trap can  
be made by using two street ells and one regular ell. The suction  
trap must be the same size as the suction line. For long vertical  
risers, additional traps may be necessary. Generally, one trap is  
recommended for each length of pipe (approximately 20 feet) to  
insure proper oil movement. See Figure 6 below for methods of  
constructing proper suction line P-traps.  
Horizontal suction lines should slope away from the evaporator  
toward the compressor at the rate of 1/4 inch per 10 feet for  
good oil return. When multiple evaporators are connected in  
series using a common suction line, the branch suction lines  
must enter the top of the common suction line.  
For dual or multiple evaporator systems, the branch lines to  
each evaporator should be sized for the evaporator capacity.  
The main common line should be sized for the total system  
capacity.  
Suction lines that are outside of refrigerated space must be  
insulated. See the Line Insulation section on page 11 for more  
information.  
Figure 6. Su
Liquid Lines  
Liquid lines should be sized for a minimum pressure drop to  
prevent “flashing”. Flashing in the liquid lines would create  
additional pressure drop and poor expansion valve operation.  
If a system requires long liquid lines from the receiver to the  
evaporator or if the liquid has to rise vertically upward any  
distance, the losses should be calculated to determine whether  
or not a heat exchanger is required. The use of a suction  
to liquid heat exchanger may be used to subcool the liquid  
to prevent flashing. This method of subcooling will normally  
provide no more than 20˚F subcooling on high pressure  
systems. The amount of subcooling will depend on the design  
and size of the heat exchanger and on the operating suction  
and discharge pressures. An additional benefit from the use  
of the suction to liquid type heat exchanger is that it can  
help raise the superheat in the suction line to prevent liquid  
return to the compressor via the suction line. Generally, heat  
exchangers are not recommended on R-22 low temperature  
systems. However, they have proved necessary on short,  
well insulated suction line runs to provide superheat at the  
compressor.  
8
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Table 4. Pressure Loss of Liquid Refrigerants in Liquid Line Risers  
(Expressed in Pressure Drop, PSIG, and Subcooling Loss, ˚F).  
Liquid Line Rise in Feet  
10ʼ  
15ʼ  
PSIG  
7.3  
20ʼ  
PSIG  
9.7  
25ʼ  
30ʼ  
40ʼ  
50ʼ  
75ʼ  
100ʼ  
Refrigerant PSIG  
˚F  
˚F  
˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F PSIG ˚F  
3.1 12.1 3.8 14.5 4.7 19.4 6.2 24.2 8.0 36.3 12.1 48.4 16.5  
4.1 12.3 5.2 14.7 6.3 19.7 8.8 24.6 11.0 36.8 17.0 49.1 23.7  
2.1 10.2 2.7 12.2 3.3 16.3 4.1 20.4 5.6 30.6 8.3 40.8 11.8  
R22  
R134a  
4.8  
4.9  
4.1  
1.6  
2.0  
1.1  
2.3  
2.9  
1.6  
7.4  
9.8  
R507, R404A  
6.1  
8.2  
Based on 110˚F liquid temperature at bottom of riser.  
Table 5. Equivalent Feet of Pipe Due to Valve and Fitting Friction  
Copper Tuber, O.D., Type “L”  
1/2  
14  
7
5/8  
16  
9
7/8  
22  
12  
5
1 1/8  
1 3/8 1 5/8 2 1/8 2 5/8 3 1/8  
3 5/8 4 1/8  
5 1/8 6 1/8  
Globe Valve (Open)  
28  
36  
18  
8
42  
21  
9
57  
28  
12  
69  
34  
14  
83  
42  
17  
99  
49  
20  
118  
57  
138  
70  
168  
83  
Angle Valve (Open)  
15  
90˚ Turn Through Tee  
Tee (Straight Through)  
or Sweep Below  
3
4
6
22  
28  
34  
.75  
1
1
2
1.5  
2
2
3
2.5  
4
3
4
3.5  
5
4
7
5
8
6
7
9
11  
16  
90˚ Elbow or Reducing  
Tee (Straight Through)  
10  
12  
14  
9
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Table 6. Weight of Refrigerants in Copper Lines During Operation  
(Pounds per 100 lineal feet of type “L” tubing).  
Line Size  
O.D.  
Suction Line at Suction Temperature  
Liquid  
Line  
4.0  
Hot Gas  
Line  
.15  
in Inches  
Refrigerant  
134a  
-40˚F  
.01  
-20˚F  
.01  
0˚F  
.02  
+20˚F  
.04  
+40˚F  
.06  
3/8  
1/2  
22  
3.9  
.22  
.02  
.03  
.04  
.06  
.08  
R507, 404A  
134a  
3.4  
.31  
.03  
.04  
.06  
.09  
.13  
7.4  
.30  
.01  
.03  
.04  
.07  
.11  
22  
7.4  
.41  
.03  
.05  
.07  
.11  
.15  
R507, 404A  
134a  
6.4  
.58  
.04  
.07  
.13  
.16  
.24  
11.9  
11.8  
10.3  
24.7  
24.4  
21.2  
42.2  
41.6  
36.1  
64.2  
63.5  
55.0  
90.9  
90.0  
78.0  
158  
156  
134  
244  
241  
209  
348  
344  
298  
471  
465  
403  
612  
605  
526  
.47  
.02  
.05  
.07  
.12  
.17  
5/8  
22  
.65  
.05  
.08  
.12  
.17  
.25  
R507, 404A  
134a  
.93  
.07  
.11  
.17  
.25  
.35  
.99  
.05  
.10  
.15  
.24  
.36  
7/8  
22  
1.35  
1.92  
1.70  
2.30  
3.27  
2.57  
3.50  
4.98  
3.65  
4.96  
7.07  
6.34  
8.61  
12.25  
9.78  
13.70  
18.92  
13.97  
18.95  
27.05  
18.90  
25.60  
36.50  
24.56  
33.40  
47.57  
.10  
.16  
.24  
.36  
.51  
R507, 404A  
134a  
.15  
.23  
.37  
.51  
.72  
.08  
.17  
.26  
.41  
.60  
1 1/8  
1 3/8  
1 5/8  
2 1/8  
2 5/8  
3 1/8  
3 5/8  
4 1/8  
22  
.17  
.28  
.42  
.61  
.87  
R507, 404A  
134a  
.26  
.39  
.63  
.86  
1.24  
1.91  
1.33  
1.87  
1.30  
1.88  
2.64  
2.24  
3.26  
4.58  
3.47  
5.03  
7.07  
4.96  
7.18  
9.95  
6.69  
9.74  
13.67  
8.75  
12.70  
17.80  
.14  
.26  
.40  
.61  
22  
.27  
.42  
.64  
.93  
R507, 404A  
134a  
.40  
.58  
.95  
1.32  
.87  
.20  
.37  
.57  
22  
.37  
.59  
.90  
1.33  
1.86  
1.51  
2.30  
3.23  
2.32  
3.54  
5.00  
3.31  
5.05  
7.14  
4.48  
6.83  
19.65  
5.84  
8.90  
12.58  
R507, 404A  
134a  
.56  
.82  
1.35  
.98  
.34  
.64  
22  
.65  
1.03  
1.43  
.99  
1.57  
2.35  
1.51  
2.42  
3.62  
2.16  
3.45  
5.17  
2.92  
4.67  
6.97  
3.81  
6.08  
9.09  
R507, 404A  
134a  
.98  
.52  
22  
1.01  
1.51  
.75  
1.59  
2.21  
1.41  
2.28  
3.15  
1.91  
3.08  
4.25  
2.49  
4.01  
5.55  
R507, 404A  
134a  
22  
1.44  
2.16  
.99  
R507, 404A  
134a  
22  
1.94  
2.92  
1.29  
2.53  
3.80  
R507, 404A  
134a  
22  
R507, 404A  
10  
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Evacuation and Leak Detection  
Evacuation  
CAUTION: Do not use the refrigeration compressor  
to evacuate the system. Do not start the  
compressor while it is in a vacuum.  
Due to the smaller molecule size of HFCʼs, they will tend to  
leak more readily than CFCʼs. Consequently, it is of the utmost  
importance that proper system evacuation and leak detection  
procedures be employed.  
A good, deep vacuum pump should be connected to both the  
low and high side evacuation valves with copper tube or high  
vacuum hoses (1/4" ID minimum). If the compressor has service  
valves, they should remain closed. A deep vacuum gauge  
capable of registering pressure in microns should be attached to  
the system for pressure readings.  
Copeland recommends a minimum evacuation to 500 microns.  
In addition, a vacuum decay test is strongly recommended to  
assure there is not a large pressure differential between the  
system and vacuum pump. Good evacuation processes include  
frequent vacuum pump oil changes and large diameter, short  
hose connections to both high and low sides of the system  
preferably using bronze braided hose.  
A shut off valve between the gauge connection and vacuum  
pump should be provided to allow the system pressure to be  
checked after evacuation. Do not turn off vacuum pump when  
connected to an evacuated system before closing shut off valve.  
Leak detection can be carried out in the conventional manner.  
If HCFC or CFC tracer gas is used, care must be taken to  
completely remove all traces of the gas prior to introducing  
HFCʼs.  
The vacuum pump should be operated until a pressure of 1,500  
microns absolute pressure is reached — at which time the  
vacuum should be broken with the refrigerant to be used in the  
system through a drier until the system pressure rises above  
“0” psig.  
Electronic leak detectors are now available that will sense  
HFCʼs. This is considered preferable since it removes the  
possibility of chlorine remaining in the system after leak testing  
with HCFCʼs and/or CFCʼs. There is a view that even small  
quantities of chlorine may act as a catalyst encouraging copper  
plating and/or corrosion and should therefore be avoided.  
NOTE: Refrigerant used during evacuation cannot  
be vented. Reclaim all used refrigerant.  
EPA regulations are constantly being  
updated to ensure your procedure follows  
correct regulations.  
WARNING: HFC-134a has been shown to be combus-  
tible at pressure as low as 5.5 psig (at  
350˚F) when mixed with air at concen  
trations more than 60% air by volume. At  
lower temperature, higher pressures are  
required to support combustion. Therefore,  
air should never be mixed with HFC-134a  
for leak detection.  
Repeat this operation a second time.  
Open the compressor service valves and evacuate the entire  
system to 500 microns absolute pressure. Raise the pressure to  
2 psig with the refrigerant and remove the vacuum pump.  
Within the last several years, manufacturers have developed  
fluorescent dye leak detection systems for use with refrigerants.  
These dyes mix with the lubricant and, when exposed to an  
ultraviolet light “fluoresce,” indicates the location of leaks.  
Copeland has tested and approved the Rigid “System Safe” dye  
and found it to be compatible with the compressor materials in  
systems.  
Leak Testing  
After all lines are connected, the entire system must be  
leak tested. The complete system should be pressurized  
to not more than 150 psig with refrigerant and dry nitrogen (or  
dry CO2). The use of an electronic type leak detector is highly  
recommended because of its greater sensitivity to small leaks.  
As a further check it is recommended that this pressure be  
held for a minimum of 12 hours and then rechecked. For a  
satisfactory installation, the system must be leak tight.  
Line Insulation  
After the final leak test, refrigerant lines exposed to high  
ambient conditions should be insulated to reduce heat pickup  
and prevent the formation of flash gas in the liquid lines.  
Suction lines should be insulated with 3/4" wall Armstrong  
“Armaflex” or equal. Liquid lines should be insulated with 1/2  
inch wall insulation or better. The insulation located in outdoor  
environments should be protected from UV exposure to prevent  
deterioration of insulating value.  
11  
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Refrigerant Charging Instructions  
Check Out and Start Up  
1. Install a liquid line drier in the refrigerant supply line  
between the service gauge and the liquid service port  
of the receiver. This extra drier will insure that all refrigerant  
supplied to the system is clean and dry.  
After the installation has been completed, the following points  
should be covered before the system is placed in operation:  
(a) Check all electrical and refrigerant connections. Be  
sure they are all tight.  
2. When initially charging a system that is in a vacuum, liquid  
refrigerant can be added directly into the receiver tank.  
(b) Check high and low pressure controls, pressure  
regulating valves, oil pressure safety controls, and all  
other safety controls, and adjust if necessary.  
3. Check serial data tag attached to the unit for refrigerant  
capacity. System refrigerant capacity is 90% of receiver  
capacity. Do not add more refrigerant than the data tag  
indicates. Weigh the refrigerant drum before charging so  
an accurate record can be kept of the weight of refrigerant  
put in the system.  
(c) Check the room thermostat for normal operation  
and adjust.  
(d) Wiring diagrams, instruction bulletins, etc. attached  
to the condensing units should be read and filed for  
future reference.  
4. Start the system and finish charging until the sight glass  
indicates a full charge and the proper amount has been  
weighed in. If the refrigerant must be added to the system  
through the suction side of the compressor, charge in  
vapor form only. Liquid charging must be done in the  
high side only or with liquid metering devices to protect  
the compressor.  
(e) All fan motors on air cooled condensers, evaporators,  
etc. should be checked for proper rotation. Fan motor  
mounts should be carefully checked for tightness and  
proper alignment.  
(f) Electric and hot gas evaporator fan motors should be  
temporarily wired for continuous operation until the room  
temperature has stabilized.  
Field Wiring  
WARNING: All wiring must be done in accordance with  
applicable codes and local ordinances.  
(g) Observe system pressures during charging and initial  
operation. Do not add oil while the system is short of  
refrigerant unless oil level is dangerously low.  
The field wiring should enter the areas as provided on the unit.  
The wiring diagram for each unit is located on the inside of the  
electrical panel door. All field wiring should be done in a profes-  
sional manner and in accordance with all governing codes.  
Before operating unit, double check all wiring connections,  
including the factory terminals. Factory connections can vibrate  
loose during shipment.  
(h) Continue charging until system has sufficient refrigerant  
for proper operation. Do not overcharge. Remember that  
bubbles in a sight glass may be caused by a restriction  
as well as a shortage of refrigerant.  
1.The nameplate on the unit is marked with the electrical  
characteristic for wiring the unit.  
(i) Do not leave unit unattended until the system has  
reached normal operating conditions and the oil charge  
has been properly adjusted to maintain the oil level at the  
center of the sight glass.  
2.Consult the wiring diagram in the unit cooler and in the  
condensing unit for proper connections.  
CAUTION: Extreme care must be taken in starting compressors  
for the first time after system charging. At this time,  
all of the oil and most of the refrigerant might be in  
the compressor creating a condition which could  
cause compressor damage due to slugging.  
Activating the crankcase heater for 24 hours prior  
to start-up is required. If no crankcase heater is  
present, then directing a 500 watt heat lamp or  
other safe heat source on the lower shell of the  
compressor for approximately thirty minutes will be  
beneficial in eliminating this condition which might  
never reoccur.  
3.For air cooled condensers, due to multiple low amp motors,  
we recommend using time delay fuse protection instead of  
circuit breakers.  
WARNING: Scroll compressor is directional dependent.  
If noisy, change phase of input wiring.  
12  
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Operational Check Out  
System Balancing - Compressor Superheat  
After the system has been charged and has operated for at  
least two hours at normal operating conditions without any  
indication of malfunction, it should be allowed to operate  
overnight on automatic controls. Then a thorough recheck of the  
entire system operation should be made as follows:  
IMPORTANT: In order to obtain the maximum capacity  
from a system, and to ensure trouble-  
free operation, it is necessary to balance  
each and every system.  
This is extremely important with any refrigeration system.  
The critical value which must be checked is suction superheat.  
(a) Check compressor discharge and suction pressures.  
If not within system design limits, determine why and  
take corrective action.  
Suction superheat should be checked at the compressor  
as follows:  
(b) Check liquid line sight glass and expansion valve  
operation. If there are indications that more refrigerant  
is required, leak test all connections and system  
components and repair any leaks before adding  
refrigerant.  
1. Measure the suction pressure at the suction service  
valve of the compressor and determine the saturation  
temperature corresponding to this pressure from a  
Temperature-Pressure” chart.  
(c) Thermostatic expansion valves must be checked for  
proper superheat settings. Feeler bulbs must be in  
positive contact with the suction line and should be  
insulated. Valves set at high superheat will lower  
refrigeration capacity. Low superheat promotes liquid  
slugging and compressor bearing washout.  
2. Measure the suction temperature of the suction line  
about one foot back from the compressor using an  
accurate thermometer.  
3. Subtract the saturated temperature from the actual  
suction line temperature. The difference is superheat.  
Too low a suction superheat can result in liquid being returned  
to the compressor. This will cause dilution of the oil and  
eventual failure of the bearings and rings or in the extreme  
case, valve failure.  
(d) Using suitable instruments, carefully check line voltage  
and amperage at the compressor terminals. Voltage  
must be within 10% of that indicated on the  
condensing unit nameplate. If high or low voltage is  
indicated, notify the power company. If amperage draw  
is excessive, immediately determine the cause and  
take corrective action. On three phase motor  
compressors, check to see that a balanced load is  
drawn by each phase.  
Too high a suction superheat will result in excessive discharge  
temperatures which cause a break down of the oil and results  
in piston ring wear, piston and cylinder wall damage.  
It should also be remembered that the system capacity  
decreases as the suction superheat increases. For maximum  
system capacity, suction superheat should be kept as low as  
is practical. Copeland mandates a minimum superheat of  
20˚F at the compressor. Heatcraft Refrigeration Products  
recommends that the superheat at the compressor be  
between 30˚F and 45˚F.  
(e) The maximum approved settings for high pressure  
controls on Heatcraft air cooled condensing equipment  
is 400 psig. On air cooled systems, check as follows:  
Disconnect the fan motors or block the condenser  
inlet air. Watch high pressure gauge for cutout point.  
Recheck all safety and operating controls for proper  
operation and adjust if necessary.  
If adjustments to the suction superheat need to be made,  
the expansion valve at the evaporator should be adjusted.  
(f) Check winter head pressure controls for pressure  
setting.  
(g) Check crankcase heater operation if used.  
(h) Install instruction card and control system diagram for  
use of building manager or owner.  
NOTE: All adjustable controls and valves must be field  
adjusted to meet desired operation. There are no  
factory preset controls or valve adjustments.  
13  
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Table 7. System Troubleshooting Chart  
PROBLEM  
Compressor will not run  
POSSIBLE CAUSES  
1. Main switch open.  
2. Fuse blown.  
POSSIBLE CORRECTIVE STEPS  
1. Close switch.  
2. Check electrical circuits and motor winding  
for shorts or grounds. Investigate for possible  
overloading. Replace fuse after fault is corrected.  
3. Overloads are automatically reset. Check  
unit closely when unit comes back on line.  
4. Repair or replace.  
3. Thermal overloads tripped.  
4. Defective contactor or coil.  
5. System shut down by safety devices.  
5. Determine type and cause of shutdown and  
correct it before resetting safety switch.  
6. None. Wait until calls for cooling.  
7. Repair or replace coil.  
6. No cooling required.  
7. Liquid line solenoid will not open.  
8. Motor electrical trouble.  
8. Check motor for open windings, short circuit  
or burn out.  
9. Loose wiring.  
9. Check all wire junctions. Tighten all  
terminal screws.  
10. Refer to page 18.  
10. Phase loss monitor inoperative.  
Compressor noisy or vibrating  
High discharge pressure  
1. Flooding of refrigerant into crankcase.  
2. Improper piping support on suction or  
liquid line.  
1. Check setting of expansion valves.  
2. Relocate, add or remove hangers.  
3. Worn compressor.  
4. Scroll compressor rotation reversed.  
3. Replace.  
4. Rewire for phase change.  
1. Non-condensables in system.  
2. System overcharges with refrigerant.  
3. Discharge shutoff valve partially closed.  
4. Fan not running.  
1. Remove the non-condensables.  
2. Remove excess.  
3. Open valve.  
4. Check electrical circuit.  
5. Adjust.  
6. Clean.  
5. Head pressure control setting.  
6. Dirty condenser coil.  
Low discharge pressure  
1. Faulty condenser temperature regulation.  
2. Suction shutoff valve partially closed.  
3. Insufficient refrigerant in system.  
4. Low suction pressure.  
1. Check condenser control operation.  
2. Open valve.  
3. Check for leaks. Repair and add charge.  
4. See corrective steps for low suction  
pressure.  
5. Variable head pressure valve.  
5. Check valve setting.  
High suction pressure  
Low suction pressure  
1. Excessive load.  
2. Expansion valve overfeeding.  
1. Reduce load or add additional equipment.  
2. Check remote bulb. Regulate superheat.  
1. Lack of refrigerant.  
2. Evaporator dirty or iced.  
1. Check for leaks. Repair and add charge.  
2. Clean.  
3. Clogged liquid line filter drier.  
4. Clogged suction line or compressor  
suction gas strainers.  
3. Replace cartridge (s).  
4. Clean strainers.  
5. Expansion valve malfunctioning.  
6. Condensing temperature too low.  
5. Check and reset for proper superheat.  
6. Check means for regulating condensing  
temperature.  
7. Improper TXV.  
7. Check for proper sizing.  
Little or no oil pressure  
1. Clogged suction oil strainer.  
2. Excessive liquid in crankcase.  
1. Clean.  
2. Check crankcase heater. Reset expansion  
valve for higher superheat. Check liquid line  
solenoid valve operation.  
3. Low oil pressure safety switch defective.  
4. Worn oil pump.  
3. Replace.  
4. Replace.  
5. Reverse direction of compressor rotation.  
5. Oil pump reversing gear stuck in wrong  
position.  
6. Worn bearings.  
6. Replace compressor.  
7. Add oil and/or through defrost.  
8. Check and tighten system.  
9. Replace gasket.  
7. Low oil level.  
8. Loose fitting on oil lines.  
9. Pump housing gasket leaks.  
Compressor loses oil  
1. Lack of refrigerant.  
1. Check for leaks and repair. Add refrigerant.  
2. Replace compressor.  
2. Excessive compression ring blowby.  
3. Refrigerant flood back.  
4. Improper piping or traps.  
3. Maintain proper superheat at compressor.  
4. Correct piping.  
Compressor thermal protector  
switch open.  
1. Operating beyond design conditions.  
1. Add facilities so that conditions are within  
allowable limits.  
2. Open valve.  
2. Discharge valve partially shut.  
3. Blown valve plate gasket.  
4. Dirty condenser coil.  
3. Replace gasket.  
4. Clean coil.  
5. Reduce charge.  
5. Overcharged system.  
14  
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Preventive Maintenance  
Air Cooled Condensing Units  
Quarterly  
• Clean electrical cabinet. Look for signs of moisture, dirt,  
debris, insects and wildlife. Take corrective action as  
required.  
1)Visually inspect unit  
• Look for signs of oil stains on interconnection piping and  
condenser coil. Pay close attention to areas around solder  
joints, building penetrations and pipe clamps. Check any  
suspect areas with an electronic leak detector. Repair any  
leaks found and add refrigerant as needed.  
• Verify operation of crankcase heater by measuring amp  
draw.  
6) Check refrigeration cycle  
• Check condition of moisture indicator/sightglass in the  
sight glass if so equipped. Replace liquid line drier if there  
is indication of slight presence of moisture. Replace  
refrigerant, oil and drier if moisture concentration is  
indicated to be high.  
• Check suction, discharge and net oil pressure readings. If  
abnormal take appropriate action.  
• Check operation of demand cooling, liquid injection or  
unloaders if so equipped.  
• Check pressure drop across all filters and driers. Replace  
as required.  
• Check moisture indicator/sightglass for flash gas. If found  
check entire system for refrigerant leaks and add refrigerant  
as needed after repairing any leaks.  
• Verify that superheat at the compressor conforms to  
specification. (30°F to 45°F)  
Check compressor sightglass (if equipped) for proper oil level.  
• Check pressure and safety control settings and verify  
proper operation.  
• Check condition of condenser. Look for accumulation of dirt  
and debris (clean as required).  
Annually  
• Check for unusual noise or vibration. Take corrective action  
as required.  
7) In addition to quarterly and semiannual maintenance checks,  
submit an oil sample for analysis  
• Inspect wiring for signs of wear or discoloration and repair  
if needed.  
• Look for high concentrations of acid or moisture. Change oil  
and driers until test results read normal.  
• Check and tighten all flare connections.  
• Investigate source of high metal concentrations, which  
normally are due to abnormal bearing wear. Look for liquid  
refrigerant in the crankcase, low oil pressure or low super-  
heat as a possible source.  
Semi-Annually  
2) Repeat all quarterly inspection items.  
3)Clean condenser coil and blades  
• Periodic cleaning can be accomplished by using a brush,  
pressurized water and a commercially available foam coil  
cleaner. If foam cleaner is used, it should not be an acid  
based cleaner. Follow label directions for appropriate use.  
Replacement Parts  
Whenever possible, replacement parts are to be obtained  
from a local wholesaler authorized to sell one of Heatcraft  
Refrigeration Productsʼ brands. Replacement parts which  
are covered under the terms of the warranty statement  
on page 2 of this manual, will be reimbursed for total part  
cost only. The original invoice from the parts supplier  
must accompany all warranty claims for replacement part  
reimbursement. Heatcraft Refrigeration Products reserves  
the right to adjust the compensation amount paid on any  
parts submitted for warranty reimbursement when a parts  
supplierʼ s original invoice is not provided with a claim.  
You may obtain information regarding local authorized  
wholesalers by calling the Heatcraft Refrigeration Products  
Replacement Parts Center at 1-800-686-7278 between the  
hours of 7:30 AM to 4:30 PM Central Time.  
• Rinse until no residue remains.  
4) Check operation of condenser fans  
• Check that each fan rotates freely and quietly. Replace any  
fan motor that does not rotate smoothly or makes excessive  
noise.  
• Check all fan blade set screws and tighten as required.  
• Check all fan blades for signs of cracks, wear or stress.  
Pay close attention to the hub and spider. Replace blades  
as required.  
• Verify that all motors are mounted securely.  
• Lubricate motors if applicable. Do not lubricate permanently  
sealed, ball bearing motors.  
5) Inspect electrical wiring and components  
• Verify that all electrical and ground connections are secure,  
tighten as required.  
• Check condition of compressor and heater contactors. Look  
for discoloration and pitting. Replace as required.  
• Check operation and calibration of all timers, relays  
pressure controls and safety controls.  
15  
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Wiring Diagram for BACU51D2CHPQ  
MINIMUM WIRE #18 AWG UNLESS OTHERWISE SPECIFIED.  
USE COPPER CONDUCTORS ONLY.  
DISCONNECT BY OTHERS.  
PLM  
208V/3ÿ/60HZ  
POWER SUPPLY  
L1 L2 L3  
L1 L2 L3  
14 AWG  
#
F1  
TRANSFORMER  
14 AWG  
#
15 A  
GND  
W
TO  
B
SHEET 2  
208V  
120V  
6 AWG  
6 AWG  
#
#
4 AWG  
4 AWG  
#
#
CB5  
CB6  
15 A  
15 A  
14 AWG  
14 AWG  
14 AWG  
14 AWG  
14 AWG  
14 AWG  
#
#
#
#
#
#
CB1  
CB2  
CB3  
CB4  
70 A  
90 A  
80 A  
80 A  
C5  
C9  
C12  
25  
C6  
C7  
C8  
C10  
25 A  
C11  
25 A  
25 A  
25 A  
25 A  
25 A  
25 A  
A
8 AWG  
6 AWG  
6 AWG  
6 AWG  
#
#
#
#
C4  
60 A  
C1  
50 A  
C2  
75 A  
C3  
60 A  
M1  
M3  
M5  
M7  
M2  
M4  
M6  
M8  
COMPRESSOR 1  
ZR12  
COMPRESSOR 2  
ZR19  
COMPRESSOR 3  
ZR16  
COMPRESSOR 4  
ZR16  
ALL COMPRESSORS THERMALLY PROTECTED  
SEE COMPRESSOR ELECTRIC BOX  
LEGEND  
COVERS FOR PROPER CONNECTION  
M1-M8 --- CONDENSER FANS(TP)  
PLM ----- PHASE LINE MONITOR  
PDS ----- PUMPDOWN SWITCH  
R1-R4 --- RELAYS  
C1-C4 --- COMPRESSOR CONTACTORS  
C5-C12 -- CONDENSER FAN CONTACTORS  
C1A1-C4A1--- C1 - C4 AUXILIARY CONTACTS  
CCH ----- CRANKCASE HEATERS  
ELECTRICAL  
ENTRANCE  
SSM1-4 -- SOLID STATE MODULE  
CB1-CB7 - CIRCUIT BREAKERS  
w/ 30 MIN TIME DELAY  
M8  
M7  
M6  
M5  
M4  
M3  
M2  
M1  
F1 ------ FUSE (CLASS CC)  
SW ------ TOGGLE SWITCHES  
TD1-TD4 --- STAGE START TIMER  
TD7-8 --- START TIMER  
FCT ----- FAN CYCLE TEMP CONTROL  
HPS ----- HIGH PRESSURE SWITCH  
LSV ----- LIQUID LINE SOLENOID VALVE  
LPS ----- LOW PRESSURE SWITCH  
COMP-4  
COMP-3  
COMP-2  
COMP-1  
BACU51D2CHPQ  
FAN ARRANGEMENT  
FACTORY WIRING  
FIELD WIRING  
16  
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Wiring Diagram for BACU59D2CHPQ  
MINIMUM WIRE #18 AWG UNLESS OTHERWISE SPECIFIED.  
USE COPPER CONDUCTORS ONLY.  
DISCONNECT BY OTHERS.  
PLM  
208V/3ÿ/60HZ  
POWER SUPPLY  
L1 L2 L3  
L1 L2 L3  
14 AWG  
#
F1  
TRANSFORMER  
14 AWG  
#
15 A  
GND  
W
TO  
B
SHEET 2  
208V  
120V  
4 AWG  
4 AWG  
#
#
4 AWG  
4 AWG  
#
#
CB5  
CB6  
15 A  
15 A  
14 AWG  
14 AWG  
14 AWG  
14 AWG  
14 AWG  
14 AWG  
#
#
#
#
#
#
CB1  
CB2  
CB3  
CB4  
90 A  
70 A  
90 A  
90 A  
C5  
C9  
C6  
C7  
C8  
C10  
25 A  
C11  
C12  
25 A  
25 A  
25 A  
25 A  
25 A  
25 A  
25 A  
8 AWG  
6 AWG  
6 AWG  
6 AWG  
#
#
#
#
C4  
75 A  
C1  
50 A  
C2  
75 A  
C3  
75 A  
M1  
M3  
M5  
M7  
M2  
M4  
M6  
M8  
COMPRESSOR 1  
ZR12  
COMPRESSOR 2  
ZR19  
COMPRESSOR 3  
ZR19  
COMPRESSOR 4  
ZR19  
ALL COMPRESSORS THERMALLY PROTECTED  
SEE COMPRESSOR ELECTRIC BOX  
LEGEND  
COVERS FOR PROPER CONNECTION  
M1-M8 --- CONDENSER FANS(TP)  
PLM ----- PHASE LINE MONITOR  
PDS ----- PUMPDOWN SWITCH  
R1-R4 --- RELAYS  
C1-C4 --- COMPRESSOR CONTACTORS  
C5-C12 -- CONDENSER FAN CONTACTORS  
C1A1-C4A1--- C1 - C4 AUXILIARY CONTACTS  
CCH ----- CRANKCASE HEATERS  
ELECTRICAL  
ENTRANCE  
SSM1-4 -- SOLID STATE MODULE  
CB1-CB7 - CIRCUIT BREAKERS  
w/ 30 MIN TIME DELAY  
M8  
M7  
M6  
M5  
M4  
M3  
M2  
M1  
F1 ------ FUSE (CLASS CC)  
SW ------ TOGGLE SWITCHES  
TD1-TD4 --- STAGE START TIMER  
TD7-8 --- START TIMER  
FCT ----- FAN CYCLE TEMP CONTROL  
HPS ----- HIGH PRESSURE SWITCH  
LSV ----- LIQUID LINE SOLENOID VALVE  
LPS ----- LOW PRESSURE SWITCH  
COMP-4  
COMP-3  
COMP-2  
2
BACU59D2CHPQ  
FAN ARRANGEMENT  
COMP-1  
FACTORY WIRING  
FIELD WIRING  
17  
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Control Circuit Wiring Diagram for BACU51 and BACU59  
18  
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Submittal  
19  
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Submittal  
20  
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Service Record  
A permanent data sheet should be prepared on each If another firm is to handle service and maintenance, additional  
refrigerationsystemataninstallation,withacopyfortheowner copies should be prepared as necessary.  
and the original for the installing contractorʼ s files.  
System Reference Data  
The following information should be filled out and signed by Refrigeration Installation Contractor at time of start-up.  
Date System Installed:  
Installer and Address:  
_____________________________________________________  
_____________________________________________________  
_____________________________________________________  
_____________________________________________________  
Condensing Unit  
Unit Model#:  
________________________________________  
Unit Serial #: ________________________________________  
____________________ Compressor Model #: _________________  
____________________ Compressor Serial #: __________________  
_________________ Volts __________________ Phase _______  
Compressor Model #:  
Compressor Serial #:  
Electrical  
Voltage at Compressor  
Amperage at Compressor  
L1__________ L2 ___________  
L1__________ L2 ___________  
L3 ___________  
L3 ___________  
21  
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Notes  
22  
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Notes  
23  
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Since product improvement is a continuing effort,  
we reserve the right to make changes in specifications without notice.  
Visit us online at www.heatcraftrpd.com.  
HEATCRAFT REFRIGERATION PRODUCTS LLC  
2175 WEST PARK PLACE BOULEVARD • STONE MOUNTAIN, GA 30087 USA  
770-465-5600 • FAX: 770-465-5990 WWW.HEATCRAFTRPD.COM  
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