Carrier Refrigerator 30GTN015 035 User Manual

30GTN015-035  
Reciprocating Liquid Chillers  
with ComfortLink™ Controls  
50/60 Hz  
Installation Instructions  
CONTENTS  
Page  
SAFETY CONSIDERATIONS. . . . . . . . . . . . . . . . . . . . . . 1  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11  
Step 1 — Rig and Place the Unit. . . . . . . . . . . . . . . . . . 1  
• RIGGING  
• PLACING UNIT  
• MOUNTING UNIT  
Step 2 — Check Compressor Mounting . . . . . . . . . . 3  
Step 3 — Cooler Fluid and Drain Piping  
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3  
• PREPARATION FOR YEAR-ROUND  
OPERATION  
• PREPARATION FOR WINTER SHUTDOWN  
Step 4 — Make Electrical Connections . . . . . . . . . . . 7  
• POWER SUPPLY  
Fig. 1 — Model 30GTN (020 Shown)  
• POWER WIRING  
Step 5 — Install Accessories. . . . . . . . . . . . . . . . . . . . 11  
• ELECTRICAL  
INSTALLATION  
Step 1 — Rig and Place the Unit  
• HOT GAS BYPASS  
Step 6 — Refrigerant Circuit. . . . . . . . . . . . . . . . . . . . . 11  
RIGGING — Preferred method is with spreader bars from  
above the unit. Use 2-in. (50 mm) OD pipe or hooks in lifting  
holes. Rig with 4 cables and spreader bars. All panels must be  
in place when rigging. See rigging label on unit for details con-  
cerning shipping weights, distance between lifting holes, center  
of gravity, and spreader bar dimensions. See Fig. 2.  
• LEAK TESTING  
• DEHYDRATION  
• REFRIGERANT CHARGE  
SAFETY CONSIDERATIONS  
If overhead rigging is not possible, place chiller on skid or  
pad for rolling or dragging. When rolling, use a minimum of  
3 rollers. When dragging, pull the pad. Do not apply force to  
the unit. When in final position, raise from above to lift unit off  
pad.  
Installing, starting up, and servicing air-conditioning equip-  
ment can be hazardous due to system pressures, electrical com-  
ponents, and equipment location (roofs, elevated structures,  
etc).  
Only trained, qualified installers and service mechanics  
should install, start up, and service this equipment (Fig. 1).  
Untrained personnel can perform basic maintenance func-  
tions such as cleaning coils. All other operations should be per-  
formed by trained service personnel.  
When working on the equipment, observe precautions in the  
literature and on tags, stickers, and labels attached to the  
equipment.  
All panels must be in place when rigging.  
PLACING UNIT — There must be at least 4 ft (1.2 m) for  
service and for unrestricted airflow on all sides of unit, and a  
minimum of 8 ft (2.4 m) clear air space above unit. Provide  
ample room for servicing cooler. For cooler removal see clear-  
ance requirements in Fig. 3-5. For multiple units, allow 8 ft  
(2.4 m) separation between units for airflow and service.  
If unit is to be used in an area with high solar radiation,  
mounted position should be such that control box is not ex-  
posed to direct solar radiation. Exposure to direct solar radia-  
tion could affect the temperature switch controlling cooler  
heaters. See Table 2.  
Follow all safety codes.  
Wear safety glasses and work gloves.  
Keep quenching cloth and fire extinguisher nearby when  
brazing.  
Use care in handling, rigging, and setting bulky  
equipment.  
See Tables 1A and 1B for Physical Data.  
ELECTRIC SHOCK HAZARD  
Open all remote disconnects before servicing  
this equipment.  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
PC 903 Catalog No. 563-068 Printed in U.S.A. Form 30GTN-10SI Pg 1 1-00 Replaces: New  
Book 2  
Tab 5c  
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are field supplied. Be sure unit is level to ensure proper oil  
return to compressor.  
Step 2 — Check Compressor Mounting As  
shipped, compressor is held down by 4 bolts. After unit is in-  
stalled, loosen each bolt using nut indicated in Fig. 6 until the  
flat washer (3/8 in.) can be moved with finger pressure.  
Step 3 — Cooler Fluid and Drain Piping Con-  
nections — When facing the cooler side of the unit, the re-  
turn water connection is on the left and the leaving water con-  
nection is on the right. See Fig. 3-5 and 7. Install a minimum  
40-mesh strainer in the cooler fluid inlet line just ahead of and  
as close as possible to the cooler. Provide a means of venting  
air from the high point of the field-installed piping.  
After field piping is complete, freeze-up protection is rec-  
ommended using inhibited ethylene glycol or other suitable in-  
hibited antifreeze solution and electric heat tapes in area where  
piping is exposed to low ambient temperatures (34 F [1 C] or  
below). Heat tapes should possess a rating for area ambients  
and be covered with a suitable thickness of closed-cell  
insulation. Route power for heating tapes from a separately-  
fused disconnect. Identify disconnect as heat tape power source  
with a warning that power must not be turned off except when  
unit is being serviced.  
The cooler drain connection is at the opposite end from the  
compressor (See Fig. 3-5). Insulate the drain piping (in the  
same manner as the chilled water piping) for at least one ft  
(305 mm) from cooler.  
LIFTING  
HOLES  
“A”  
CENTER OF GRAVITY  
“B” “C”  
mm in. mm in. mm in. mm  
MAXIMUM  
SHIP WT  
“D”  
UNIT  
30GTN  
Lb  
Kg  
in.  
015  
020  
025  
030  
035  
1876 851  
2031 921  
2415 1095  
2606 1182  
94.0 2388 48.0 1219 23.0 583 49.5 1256  
94.0 2388 47.5 1207 23.0 583 49.5 1256  
94.0 2388 51.0 1295 34.5 876 73.5 1867  
94.0 2388 51.0 1295 34.5 876 73.5 1867  
3365 1526 127.0 3225 66.5 1689 35.5 901 73.5 1867  
Fig. 2 — Rigging with Spreader Bars  
(Field Supplied)  
PREPARATION FOR YEAR-ROUND OPERATION — If  
unit is on year-round operation, add sufficient inhibited ethyl-  
ene glycol or other suitable inhibited antifreeze solution to  
chilled water to prevent freezing under low-ambient operating  
conditions. Consult local water authority on characteristics of  
area water and add a recommended inhibitor to the chilled  
water.  
PREPARATION FOR WINTER SHUTDOWN Do not  
shut off control power disconnect during off-season shutdown.  
At end of cooling season:  
Table 2 — Temperature Limits for Standard Units  
TEMPERATURE  
Maximum Ambient Temperature  
Minimum Ambient Temperature  
Maximum Cooler EWT*  
Maximum Cooler LWT  
Minimum cooler LWT†  
F
125  
0
C
52  
–18  
35  
95  
70  
38  
21  
3.3  
1. Drain water from system.  
LEGEND  
2. Replace drain plug and put 2 gallons (8 liters) of inhib-  
ited ethylene glycol (or other suitable inhibited anti-  
freeze) in cooler to prevent freezing of residual water.  
(Remove plug on top of leaving chilled water nozzle to  
add liquid.)  
EWT  
LWT  
Entering Fluid (Water) Temperature  
Leaving Fluid (Water) Temperature  
*For sustained operation, EWT should not exceed 85 F (29.4 C).  
†Unit requires modification below this temperature.  
MOUNTING UNIT — When unit is in proper location, use  
of mounting holes in base rails is recommended for securing  
unit to supporting structure, or for mounting unit on vibration  
isolators if required. See Fig. 3-5. Fasteners for mounting unit  
3. At the beginning of the next cooling season, refill cooler  
and add recommended inhibitor.  
3
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NOTES:  
1. There must be minimum 8 ft (2.4 m) clear air space above unit.  
2. Dimensions in [ ] are in millimeters.  
3. The approximate operating weight of the unit is:  
50 Hz  
60 Hz  
Lb  
UNIT  
Lb  
Kg  
790  
831  
846  
902  
UNIT  
Kg  
744  
786  
826  
882  
30GTN015  
30GTN015C  
30GTN020  
30GTN020C  
1741  
1833  
1864  
1988  
30GTN015  
30GTN015C  
30GTN020  
30GTN020C  
1640  
1732  
1821  
1945  
LEGEND  
UNIT  
A
C
Copper Coils  
Compressor  
Mounting  
National Electrical Code (U.S.A.)  
Variable-Air Volume  
COMPR  
MTG  
NEC  
VAV  
(1219)  
30GTN015  
4-0″  
(1207)  
3-111/2″  
30GTN020  
Fig. 3 — Dimensional Drawing, 30GTN015,020  
4
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NOTES:  
1. There must be minimum 8 ft (2.4 m) clear air space above unit.  
2. Dimensions in [ ] are in millimeters.  
3. The approximate operating weight of the unit is:  
60 Hz  
Lb  
50 Hz  
Lb  
UNIT  
Kg  
UNIT  
Kg  
30GTN025  
30GTN025C  
30GTN030  
30GTN030C  
2170  
2324  
2268  
2474  
984  
30GTN025  
30GTN025C  
30GTN030  
30GTN030C  
2193  
2347  
2332  
2538  
995  
1054  
1029  
1122  
1065  
1058  
1151  
LEGEND  
C
Copper Coils  
Compressor  
Mounting  
National Electrical Code (U.S.A.)  
Variable-Air Volume  
COMPR  
MTG  
NEC  
VAV  
Fig. 4 — Dimensional Drawing, 30GTN025,030  
5
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NOTES:  
1. There must be minimum 8 ft (2.4 m) clear air space above unit.  
2. Dimensions in [ ] are in millimeters.  
3. The approximate operating weight of the unit is:  
60 Hz  
UNIT  
Lb  
Kg  
30GTN035  
30GTN035C  
2965  
3273  
1345  
1485  
LEGEND  
C
Copper Coils  
Compressor  
Mounting  
COMPR  
MTG  
NEC  
National Electrical Code (U.S.A.)  
Fig. 5 — Dimensional Drawing, 30GTN035  
6
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NOTE: All dimensions are in inches.  
Fig. 6 — Compressor Mounting  
power to the Main Base Board (MBB) is off. They are  
protected by a 7-amp fuse in field-supplied control power  
supply disconnect.  
3. The control circuit field-supplied disconnect should never  
be off except when unit is being serviced or is to be down  
for a prolonged period, in which case cooler should be  
drained. When operation is resumed, crankcase heater  
should be energized for 24 hours before start-up.  
Liquid Chiller  
REFRIGERATING  
MACHINE  
U.N.2857  
OUT  
IN  
4. Power entry is at one end only.  
5. Maximum field wire sizes allowed by lugs on terminal  
block are:  
350 kcmil for 30GTN030,035 (208/230-3-60) and  
30GTN030 (230-3-50) units.  
WATER OUTLET  
(LEAVING WATER)  
WATER INLET  
(RETURN WATER)  
WATER  
DRAIN  
2/0 AWG for all other units.  
Fig. 7 Water Connection Locations  
6. Terminals for field power supply are suitable for copper,  
copper-clad aluminum, or aluminum conductors. Insula-  
tion must be rated 167 F (75 C) minimum.  
Step 4 — Make Electrical Connections  
POWER SUPPLY — Electrical characteristics of available  
power supply must agree with unit nameplate rating. Supply  
voltage must be within limits shown in Tables 3A and 3B.  
Field Connections  
Main Power — Bring wires from the fused disconnect switch  
through hole in bottom rail of unit to control box (Fig. 3-5) and  
connect to terminals on terminal block TB1 (See Fig. 8).  
Control Power — Bring separate source power (see Fig. 8,  
note 2) into unit as shown in Fig. 3-5. This supplies power for  
control circuit, compressor crankcase heater, and cooler heater.  
IMPORTANT: Operating unit on improper supply volt-  
age or with excessive phase imbalance constitutes abuse  
and may affect Carrier warranty.  
POWER WIRING — All power wiring must comply with ap-  
plicable local and national codes. Install field-supplied branch  
circuit fused disconnect(s) per NEC (National Electrical Code,  
U.S.A.) of a type that can be locked OFF or ON. Disconnect(s)  
must be within sight from and readily accessible from unit in  
compliance with NEC Article 440-14.  
Connect incoming wires to TB4 in unit control box (L1 to  
and L2 to  
). Neutral side must be connected to the neutral  
terminal block (by C-A1) for 380-3-60 and 400-3-50 V units  
only. In the auxiliary power supply a field-supplied disconnect  
with 15-amp circuit protection must be provided to accommo-  
date crankcase heater and cooler heater cable.  
To comply with NEC Article 440-14, the disconnect must  
be located within sight from and readily accessible from unit.  
General Wiring Notes  
1. The control circuit power must be from a separate source  
and must be brought through a field-supplied fused dis-  
connect rated at 15 amps for 230-v and 30 amps for 115-v  
control power. Two terminal blocks are provided for  
field-wired control devices.  
IMPORTANT: To ensure power to the heaters, make  
sure auxiliary power to unit is always on (except for  
servicing or prolonged shutdown).  
2. Crankcase and cooler heaters are wired in the control cir-  
cuit so they are always operable as long as the control  
power disconnect is on and safety device is open or the  
Enable-Off-Remote contact switch is in the Off position.  
Heaters are wired so that they are energized even when  
A toggle switch (marked Emergency On-Off on the unit  
label diagram and by the switch) allows the control circuit to be  
manually disconnected when necessary. This switch does not  
affect the crankcase heater and cooler heater cable.  
7
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Table 3A Electrical Data Standard Unit  
UNIT  
CONTROL CIRCUIT  
Supplied  
UNIT  
SIZE  
30GTN  
Supplied*  
Min  
Voltage  
V-Hz (3 Ph)  
Rec Fuse  
Size  
V-Hz  
(Single Ph)  
MCA and  
MOCP  
MCA  
MOCP  
ICF  
Max  
253  
506  
633  
342  
440  
253  
506  
633  
342  
440  
253  
506  
633  
342  
440  
253  
506  
633  
342  
440  
253  
506  
633  
342  
Min  
104  
104  
104  
198  
198  
104  
104  
104  
198  
198  
104  
104  
104  
198  
198  
104  
104  
104  
198  
198  
104  
104  
104  
198  
Max  
127  
127  
127  
254  
254  
127  
127  
127  
254  
254  
127  
127  
127  
254  
254  
127  
127  
127  
254  
254  
127  
127  
127  
254  
208/230-60  
460-60  
575-60  
187  
414  
518  
418  
342  
187  
414  
518  
418  
342  
187  
414  
518  
418  
342  
187  
414  
518  
418  
342  
187  
414  
518  
418  
82.2  
38.3  
31.7  
43.9  
49.4  
97.4  
49.6  
42.9  
51.1  
60.5  
124.7  
60.7  
52.4  
64.7  
68.5  
145.5  
68.7  
54.9  
73.6  
87.8  
203.0  
91.1  
81.6  
111.1  
125  
60  
50  
70  
80  
150  
80  
70  
278.4  
126.2  
102.8  
152.8  
179.0  
357.4  
179.2  
126.8  
198.8  
229.0  
458.4  
229.2  
170.8  
254.8  
259.0  
518.4  
259.2  
182.8  
287.8  
351.0  
708.6  
354.3  
286.2  
393.7  
100  
45  
40  
60  
60  
125  
60  
60  
60  
80  
150  
80  
70  
80  
90  
175  
90  
70  
115-60  
115-60  
115-60  
230-60  
230-50  
115-60  
115-60  
115-60  
230-60  
230-50  
115-60  
115-60  
115-60  
230-60  
230-50  
115-60  
115-60  
115-60  
230-60  
230-50  
115-60  
115-60  
115-60  
230-60  
30  
30  
30  
15  
15  
30  
30  
30  
15  
15  
30  
30  
30  
15  
15  
30  
30  
30  
15  
15  
30  
30  
30  
15  
015  
020  
025  
380-60  
380/415-50  
208/230-60  
460-60  
575-60  
380-60  
380/415-50  
208/230-60  
460-60  
575-60  
380-60  
380/415-50  
208/230-60  
460-60  
575-60  
380-60  
380/415-50  
208/230-60  
460-60  
575-60  
380-60  
80  
100  
200  
100  
80  
110  
110  
250  
110  
90  
125  
150  
350  
150  
125  
175  
030  
035  
90  
110  
250  
110  
100  
150  
See Legend and Notes on page 9.  
8
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Table 3B Electrical Data Unit with Factory-Installed Motormaster® I Control  
UNIT  
MCA  
CONTROL CIRCUIT  
Supplied  
UNIT  
SIZE  
Supplied*  
Min  
Voltage  
Rec Fuse  
Size  
V-Hz  
MCA and  
MOCP  
MOCP  
ICF  
30GTN  
V-Hz (3 Ph)  
(Single Ph)  
Max  
253  
506  
633  
342  
440  
253  
506  
633  
342  
440  
253  
506  
633  
342  
440  
253  
506  
633  
342  
440  
253  
506  
633  
342  
Min  
104  
104  
104  
198  
198  
104  
104  
104  
198  
198  
104  
104  
104  
198  
198  
104  
104  
104  
198  
198  
104  
104  
104  
198  
Max  
127  
127  
127  
254  
254  
127  
127  
127  
254  
254  
127  
127  
127  
254  
254  
127  
127  
127  
254  
254  
127  
127  
127  
254  
208/230-60  
460-60  
575-60  
187  
414  
518  
418  
342  
187  
414  
518  
418  
342  
187  
414  
518  
418  
342  
187  
414  
518  
418  
342  
187  
414  
518  
418  
82.2  
38.3  
30.8  
43.9  
51.9  
97.4  
49.6  
42.0  
51.1  
63.0  
124.7  
60.7  
51.5  
64.7  
71.0  
145.5  
68.7  
54.0  
73.6  
90.3  
203.0  
91.1  
80.7  
111.1  
125  
60  
50  
70  
80  
150  
80  
70  
278.4  
129.3  
105.6  
152.8  
181.5  
357.4  
182.3  
129.6  
198.8  
231.5  
458.4  
232.3  
173.6  
254.8  
261.5  
518.4  
262.3  
185.6  
287.8  
353.5  
708.6  
357.4  
289.0  
393.7  
100  
45  
40  
60  
70  
125  
60  
50  
60  
80  
150  
80  
70  
80  
90  
175  
90  
70  
115-60  
115-60  
115-60  
230-60  
230-50  
115-60  
115-60  
115-60  
230-60  
230-50  
115-60  
115-60  
115-60  
230-60  
230-50  
115-60  
115-60  
115-60  
230-60  
230-50  
115-60  
115-60  
115-60  
230-60  
30  
30  
30  
15  
15  
30  
30  
30  
15  
15  
30  
30  
30  
15  
15  
30  
30  
30  
15  
15  
30  
30  
30  
15  
015  
020  
025  
380-60  
380/415-50  
208/230-60  
460-60  
575-60  
380-60  
380/415-50  
208/230-60  
460-60  
575-60  
380-60  
380/415-50  
208/230-60  
460-60  
575-60  
380-60  
380/415-50  
208/230-60  
460-60  
575-60  
380-60  
80  
100  
200  
100  
80  
110  
110  
250  
110  
90  
125  
150  
350  
150  
125  
175  
030  
035  
90  
110  
250  
110  
100  
150  
LEGEND  
Determine maximum deviation from average voltage:  
ICF  
Maximum Instantaneous Current Flow during starting  
(the point in the starting sequence where the sum of  
the LRA for the starting compressor, plus the total  
RLA for all running compressors, plus the total FLA for  
all running fan motors is maximum).  
(AB) 243 239 = 4 v  
(BC) 239 236 = 3 v  
(AC) 239 238 = 1 v  
Maximum deviation is 4 v. Determine percent voltage imbalance:  
4
% Voltage Imbalance = 100 x  
239  
MCA Minimum Circuit Amps (complies with National Elec-  
trical Code [NEC, U.S.A.], Section 430-24)  
MOCP Maximum Overcurrent Protection  
= 1.7%  
*Units are suitable for use on electrical systems where voltage sup-  
plied to unit terminals is not below or above listed minimum and  
maximum limits.  
This amount of phase imbalance is satisfactory as it is below the  
maximum allowable 2%.  
NOTE: Never operate a motor where a phase imbalance in supply  
voltage is greater than 2%. Use the following formula to determine  
the percent voltage imbalance.  
IMPORTANT: Contact your local electric utility company  
immediately if the supply voltage phase imbalance is more  
than 2%.  
Percent Voltage Imbalance  
max voltage deviation from average voltage  
= 100 x  
average voltage  
Example: Supply voltage is 240-3-60.  
AB = 243 v  
BC = 236 v  
AC = 238 v  
243 + 236 + 238  
Average voltage =  
3
=
239 v  
9
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TB4  
REMOTE  
ON-OFF  
LEGEND  
NOTES:  
1. Factory wiring is in accordance with the National Electrical Code. Any field mod-  
ifications or additions must be in compliance with all applicable codes.  
2. Connect separate source of control power from field supplied fused disconnect  
to terminal 1 of TB4. Neutral side must be connected to terminal 2. This provides  
power for the unit control circuit, cooler heater and compressor crankcase  
heater.  
C
Compressor Contactor  
Circuit Breaker  
Carrier Comfort Network  
Chilled Water Flow Switch  
Chilled Water Pump  
Chilled Water Pump Interlock  
Fan Contactor  
CB  
CCN  
CWFS  
CWP  
CWPI  
FC  
GCS  
LEN  
MBB  
NEC  
3. All field interlock contacts must have minimum rating of 360 va pilot duty plus  
capacity required for field-installed equipment.  
4. For internal unit wiring reference wiring book or unit wiring label diagram.  
5. For GCS accessory, remove jumper wire between terminals 5 and 8 on terminal  
block TB2.  
6. For part wind start accessory, remove gray jumper wire between C-A1-C1 and  
C-A1A-C1. Time delay relay shown in suggested mounting position.  
7. Voltage requirements:  
Ground Current Sensor  
Local Equipment Network  
Main Base Board  
National Electrical Code  
(U.S.A. Standard)  
TB  
TDR  
TRAN  
Terminal Block  
Time Delay Relay  
Transformer  
MAIN POWER  
208/230-3-60  
460-3-60  
CONTROL POWER  
115-1-60  
Field Power Wiring  
Field Control Power Wiring  
Field Control Wiring  
115-1-60  
575-3-60  
380-3-60  
115-1-60  
Factory-Installed Wiring  
Field-Installed Device  
220-1-60  
380/415-3-50  
230-1-50  
Fig. 8 Field Wiring Schematic  
10  
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HOT GAS BYPASS — Hot gas bypass usually is not rec-  
ommended because it results in application of equipment out  
of its normal design application range. However, if its use is  
required, the appropriate hot gas bypass package may be used.  
For installation details, refer to separate instructions supplied  
with the accessory package.  
Step 5 Install Accessories  
ELECTRICAL — A number of electrical accessories are  
available to provide the following optional features (for details,  
refer to the Controls, Start-Up, Operation, Service, and  
Troubleshooting book):  
Energy Management Module (used for any of the fol-  
lowing types of temperature reset, demand limit and ice  
features):  
Step 6 Refrigerant Circuit  
LEAK TESTING — Units are shipped with complete op-  
erating charge of R-22 (see Tables 1A-1B) and should be  
under sufficient pressure to conduct a leak test. If there is no  
pressure in the system, use standard refrigeration practices to  
search for the leak. Repair the leak using good refrigeration  
practices. After leaks are repaired, system must be evacuated  
and dehydrated prior to recharging with refrigerant.  
DEHYDRATION — Refer to Carrier Standard Service Tech-  
niques Manual, Chapter 1, Refrigerants, Sections 6 and 7 for  
details. Do not use compressor to evacuate system.  
— 4 to 20 mA leaving fluid temperature reset (requires  
field-supplied 4 to 20 mA generator)  
— 4 to 20 mA cooling set point reset (requires field-  
supplied 4 to 20 mA generator)  
— Discrete inputs for 2-step demand limit (requires field-  
supplied dry contacts)  
— 4 to 20 mA demand limit (requires field-supplied 4 to  
20 mA generator)  
— Discrete input for Ice Done switch (requires field-  
supplied dry contacts)  
REFRIGERANT CHARGE (Refer to Table 1A or 1B) —  
Immediately ahead of filter drier in each circuit is a factory-  
1
Chilled fluid flow switch/interlock  
Navigator display:  
installed liquid line service valve. Each valve has a /4-in.  
Schrader connection for charging liquid refrigerant.  
Provides hand-held, mobile capability using easy to read  
4-line display. Keypad function is the same as the Scrolling  
Marquee module. Features magnet for ‘hands free’ service  
of components.  
11  
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Copyright 2000 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
PC 903 Catalog No. 563-068 Printed in U.S.A. Form 30GTN-10SI Pg 12 1201 1-00 Replaces: New  
Book 2  
Tab 5c  
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