York Yrhbc User Manual

FAN COIL  
AIR CONDITIONERS  
Form 115.20-NOM2 (105)  
Supersedes: Form 115.20-NOM2 (1199)  
INSTALLATION, OPERATION, & MAINTENANCE  
00168VIP  
00172VIP  
MODEL YCHBC – Ceiling Cabinet Model  
MODEL YHBC – Ceiling Concealed Model  
00173VIP  
00170VIP  
MODEL YRHBC – Telescoping / Recessed Ceiling Model  
MODEL YHH – Ceiling Concealed Model with Electric Heat  
00171VIP  
00174VIP  
MODEL YHYB – High Capacity Ceiling Concealed Model  
MODEL YPHBC – Ceiling Concealed Model with Insulated  
Return. Plenum and Filter  
MODEL YPHH – Ceiling Concealed Model with Electric  
Heat, Insulated Return Plenum and Filter  
00175VIP  
MODEL YPHYB – High Capacity Ceiling Concealed Model  
with Insulated Return Plenum and Filter  
Notes:  
1. 2-Pipe units have one water coil. 4-Pipe units have two water coils.  
2. Changeover is used to select heating or cooling mode.  
3. YORK International does not recommend “fan cycle” applications for cooling on unit mounted thermostats.  
4. For proper operation, control valve must be normally closed.  
5. Aquastats provided where required.  
6. Electric Heat is only available in the YHH and YPHH units. These units require a remote thermostat (low voltage 4 wire thermostat).  
***** WARNING TO INSTALLER, SERVICE PERSONNEL AND OWNER *****  
Altering the product or replacing parts with non authorized factory parts voids all warranty or  
implied warranty and may result in adverse operational performance and/or a possible hazardous  
safety condition to service personnel and occupants. Company employees and/or contractors are  
not authorized to waive this warning.  
L23952Y 1-05  
FORM 115.20-NOM2 (105)  
INSTALLATION  
RECEIVING  
In free (non-ducted return air) return installations of  
YHBC, YHH, YHHS and YHYB units; the furred  
down area must be completely sealed (except return  
air grille) to ensure that all return air is pulled from  
the conditioned space and not from other areas of the  
building structure.  
Material in this shipment has been inspected at the  
factory and released to the transportation agency in  
good condition. When received, a visual inspection of  
all cartons should be made immediately. Any evidence  
of rough handling or apparent damage should be noted  
on the delivery receipt and the material inspected in the  
presence of the carrier's representative.  
Access must be provided for servicing the unit. If  
this access is provided by a removable ceiling panel,  
ample space must be allowed for removal of the blower  
panel and to provide access to electrical and plumbing  
controls.  
If damage is found, a claim should be  
filed against the carrier immediately.  
Unit must not be operated during  
building construction due to ex-  
cessive airborne dust and debris. The  
units must not be operated under any  
circumstances without an air filter in  
place.  
STORAGE  
If the equipment is not to be immediately installed, store  
it in a dry location with the motor protected against  
moisture, dust, corrosion and physical damage.  
WIRING  
PREPARE CEILING FOR MOUNTING  
All wiring must comply with the local and national code  
requirements. Units are provided with wiring diagrams  
and nameplate data to provide information required for  
necessary field wiring.  
Depending upon building construction, provisions  
for mounting the unit must be made by the contractor  
according to architects; drawings.  
For power wiring a 4 x 4 electrical box is provided on  
the cabinet for connection of power supply and is located  
on the same side as piping.  
It is important to ensure that the fan coils are securely  
mounted and the structure is sufficient to support the  
weight of the equipment. All anchors for mounting the  
equipment must be placed and sized to ensure a safe  
and durable installation.  
On YHBC units, the box is shipped unattached, it is  
field attached to the unit in a location convenient to  
electrical entrance.  
The YHBC, YPHBC, YRHBC, YHH, YHHS, YPHH,  
YHYB, and YPHYB units are designed for installation  
in a horizontal position above a dropped ceiling. The  
YCHBC is a cabinet unit intended for horizontal  
exposed surface mounting.  
Any devices such as fan switches or  
thermostats that have been furnished  
by the factory for field installation  
must be wired in strict accordance  
with the wiring diagram that is sup-  
plied with the unit. Failure to do so  
could result in damage or injury.  
3
YORK INTERNATIONAL  
 
FORM 115.20-NOM2 (105)  
INSTALLATION  
 
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FIG. 2 – HORIZONTAL UNITS - TYPICAL WIRING  
4
YORK INTERNATIONAL  
FORM 115.20-NOM2 (105)  
INSTALLATION  
T334 THERMOSTAT  
Heat-Off Cool, Fan Auto-On, 24V, Manual changeover, 4-Wire Thermostat (R, G, Y, W) Adj. Heat Anticipator,  
Fixed Cooling Anticipator, Fan Cycling (Cooling) or (Heating/Cooling), No Heating Required.  
T404 THERMOSTAT  
Heat-Off Cool, Fan Auto-On, 24V, Manual changeover, 6-Wire Thermostat (R, G, O, Y, W, B)  
Adj. Heat / Fixed Cool Anticipator, Fixed Cooling Anticipator, Fan Cycling.  
(O & B can be used for cool and heat relays respectively, or for cool & heat water valves.)  
T200 THERMOSTAT OPTION (W/CONTROLLER)  
Heat-Off Cool, Fan -On, 24V, Manual changeover, 7-Wire Thermostat (R, C, Hi, Med, Lo, 24V Heat,  
24V Coil), Auto fan speed control, digital readout, auto-overide.  
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FIG. 3 – WIRING SCHEMATIC FOR HBC/PHBC/CHBC/RHBC/HYB/PHYB  
5
YORK INTERNATIONAL  
FORM 115.20-NOM2 (105)  
INSTALLATION  
These units are provided with six (6) mounting holes  
(see drawings for details). Metal washers and nuts of  
the proper size are to be provided by the installer. When  
necessary, use shims to obtain the proper level. This will  
ensure that the condensate will drain from the unit.  
3. Open all valves (mid-way for hand valves, manually  
open on motorized valves) prior to soldering.  
4. When soldering to bronze or brass, heat the pip-  
ing while in the socket/cup and begin introducing  
the solder when the flux boils rapidly. Avoid direct  
flame into the solder joint.  
PIPING  
5. Heat can only be applied to the cup of the valve body  
for a minimal time before damage occurs (even with  
the use of wet rags.  
These units employ a hydronic coil designed for use  
with either hot or chilled water.  
6. Avoid rapid quenching of solder joints, as this will  
produce joints of inferior quality.  
All piping must be adequately sized to meet the design  
water flow requirements as specified for the specific  
installation. Piping must be installed in accordance with  
all applicable codes.  
7. The valve package will not support the weight of  
the connecting pipes.All pipes, which are connected  
to the units, must be completely supported prior to  
connection to the unit.  
PIPE SIZES  
8. Provisions must be made for expansion and con-  
traction of piping systems. All horizontal and  
vertical risers, including runouts, must be able to  
withstand significant movement with temperature  
changes. Failure to do so will result in damage and  
failure of piping, fittings and valves throughout the  
building.  
All models except YHYB/YPHYB:  
• HW/CW coils are 3/8" OD tubing.  
• Tubing connections are 5/8" OD.  
Models YHYB/YPHYB:  
9. Never insulate the heads or motorized portion of  
control valves. Damage can occur in the form of  
excessive heat build up and interference to the  
operation and moving parts will result.  
• HW/CW coils are 1/2" OD tubing.  
• Tubing connections are 7/8" OD.  
Manual air vents are provided standard on all coils  
10. All piping made in the field should be installed with  
consideration of additional space for any electrical  
routing that may be required.  
All chilled water piping must be insulated to prevent  
condensation.  
11. Hydronic systems are not designed to hold pres-  
surized air and should only be tested with water.  
Prior to connecting to the fan coil,  
all external piping must be purged  
of debris.  
After the system has been proven leak free, all lines and  
valve control packages must be insulated as specified  
on the building plans.  
When connecting piping or valve  
kits to fan coil units, do not bend or  
reposition the coil header tubing for  
alignment purposes. This could cause  
a tubing fracture resulting in a water  
leak when water pressure is applied  
to the system.  
Many valve packages will not phys-  
ically allow all components to fit  
over an auxiliary drain pan. It is the  
installers responsibility to ensure ad-  
equate condensation prevention. The  
installer must also ensure that there  
is no condensate drippage onto elec-  
trical components beneath insulated  
components.  
PRECAUTIONS  
1. Flush all field piping prior to connection to remove  
all debris.  
2. Use wet cotton rags to cool valve bodies when  
soldering.  
6
YORK INTERNATIONAL  
 
FORM 115.20-NOM2 (105)  
INSTALLATION  
VALVE CLUSTER  
2-Way Motorized Valve Assemblies  
1. The motorized valve assembly should be attached to  
the supply header, which is the connection nearest  
the air outlet flange on the unit.  
2. Prior to soldering the joints, operate all the hand  
valves to ensure that the handles will fully open and  
close without interference to other valves, ceiling,  
wall, plenum or other accessories.  
00187VIP  
3. All valves will operate at any angle with the excep-  
tion of the motorized valve, which must be installed  
with the power head above horizontal. The actuator  
box requires a 3/4" clearance for removal.  
FIG. 5 – 3 WAY MOTORIZED VALVE ASSEMBLY  
DRAIN PIPING  
Condensate drain lines must be installed with adequate  
slope away from the unit to assure positive drainage.  
YRHBC andYCHBC fan coil units require a minimum  
trap of 1-1/2 inches be provided in the drain line to  
assure proper drainage. YHBC, YPHBC, YHH, YPHH,  
YHYB, andYPHYB fan coil units may be located where  
the return air space is large enough that a negative  
pressure is not present, however, a trapped condensate  
line is recommended to ensure proper drainage of unit in  
case a negative condition should occur (see Installation  
Drawings for locations and sizes).  
00186VIP  
The drain should always be connected or piped to an  
acceptable disposal point sloped away from the unit at  
least 1/8" per foot  
FIG. 4 – 2 WAY MOTORIZED VALVE ASSEMBLY  
3-Way Motorized Valve Assembly  
1. The 3-way valve assemblies will mount to the  
coil in only one position. On four-pipe right hand  
systems, a "B" valve assembly is required for the  
chilled water connection and an "A" valve assembly  
is required for the hot water connection. On left  
hand systems, an "A" valve assembly is required  
for the chilled water connection and the hot water  
connection. (See figure 4.)  
LD04801  
FIG. 6 – TYPICAL CONDENSATE PIPING  
2. Prior to soldering the joints, operate all the hand  
valves to ensure that the handles will fully open and  
close without interference to other valves, ceiling,  
wall, plenum or other accessories.  
TABLE 2 - DRAIN LINE SIZES  
UNIT  
YHBC  
YPHBC  
YRHBC  
YHH  
PRIMARY  
3/4 MPT  
3/4 MPT  
3/4 MPT  
3/4 MPT  
SECONDARY  
5/8 OD  
3. All valves will operate at any angle with the excep-  
tion of the motorized valve, which must be installed  
with the power head above horizontal. The actuator  
box requires a 3/4" clearance for removal.  
3/4 MPT  
3/4 MPT  
7/8 OD  
YPHH  
YHYB  
3/4 MPT  
3/4 MPT  
3/4 MPT  
7/8 OD  
3/4 MPT  
3/4 MPT  
YPHYB  
7
YORK INTERNATIONAL  
 
FORM 115.20-NOM2 (105)  
INSTALLATION  
Ceiling Concealed Model – MODEL YHBC  
6
YP HBC - 126 - 3 RH  
NOM. CFM (100's)  
3, 4, 5, 6, 8, 10 or 13  
Coil Connections (looking with airflow,  
from blower end)  
RH = Right Hand  
LH = Left Hand  
Unit Style  
Y - Ceiling Concealed  
Coil Configuration  
YP - with return plenum & filter  
YR - recessed w/telescoping panel  
YC - cabinet exposed  
3 = 2 Pipe Coil, 3 Row  
4 = 2 Pipe Coil, 4 Row  
31 = 4 Pipe Coil, 3 Row Cool  
1 Row Heat  
HBC - Horizontal Blower Coil  
32 = 4 Pipe Coil, 3 Row Cool  
2 Row Heat  
41 = 4 Pipe Coil, 4 Row Cool  
1 Row Heat  
Unit Voltage  
126 - 120V – 1 Ph – 60 Hz  
Filter Note:  
YHBC units are not available with filters. YHBC units can be field converted YHBC to YPHBC by adding an accessory plenum. See instruction  
below for details on field conversion.  
FIELD CONVERSION YHBC TO YPHBC  
Remove 2 screws holding the motor/blower assembly to the fan coil unit; remove and discard the drip guard; remove the bottom panel from  
the plenum; attach the plenum box to the fan coil unit using 5 screws; re-install the motor/blower assembly to the fan coil unit; for wiring,  
remove the motor leads from the j-box and attach the box to the outside of the plenum; route the motor leads to the j-box; replace the bottom  
panel; install the filter; if hanger brackets are needed, attach to the plenum, both ends.  
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PHYSICAL DIMENSIONS (inches)  
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MODEL  
3YHBC  
4YHBC  
5YHBC  
6YHBC  
8YHBC  
10YHBC  
13YHBC  
A
B
C
D
30-1/8  
36-1/8  
40-1/8  
40-1/8  
46-1/8  
52-1/8  
59-1/8  
27-1/4  
33-1/4  
37-1/4  
37-1/4  
43-1/4  
49-1/4  
56-1/4  
20-1/8  
26-1/8  
30-1/8  
30-1/8  
36-1/8  
42-1/8  
49-1/8  
25-1/4  
31-1/4  
35-1/4  
35-1/4  
41-1/4  
47-1/4  
54-1/4  
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NOTES:  
1. Model 3 YHBC has only one blower  
2. Model 13 YHBC has four blowers and two motors  
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LD047768B  
8
YORK INTERNATIONAL  
 
FORM 115.20-NOM2 (105)  
INSTALLATION  
Ceiling Concealed Model with Insulated Return Plenum and Filter – MODEL YPHBC  
 
 
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LD010229  
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PHYSICAL DIMENSIONS - INCHES  
MODEL  
A
B
C
D
E
FILTER SIZE  
3YPHBC  
4YPHBC  
5YPHBC  
6YPHBC  
8YPHBC  
10YPHBC  
13YPHBC  
24  
30  
34  
34  
40  
46  
53  
22  
28  
32  
32  
38  
44  
51  
20-1/8  
26-1/8  
30-1/8  
30-1/8  
36-1/8  
42-1/8  
49-1/8  
30-1/8  
36-1/8  
40-1/8  
40-1/8  
46-1/8  
52-1/8  
59-1/8  
27-1/4  
33-1/4  
37-1/4  
37-1/4  
43-1/4  
49-1/4  
56-1/4  
10 X 24 X 1  
10 X 30 X 1  
10 X 34 X 1  
10 X 34 X 1  
10 X 40 X 1  
10 X 46 X 1  
10 X 53 X 1  
NOTES:  
1) Return plenums are insulated  
2) YPHBC units are provided with filters in the plenum.  
3) Standard plenums are end return and can be field converted to bottom return by trading  
the blockoff and face panel of the plenum.  
4) Filter has seperate filter access panel for easier service.  
9
YORK INTERNATIONAL  
FORM 115.20-NOM2 (105)  
INSTALLATION  
CEILING EXPOSED CABINET – MODEL YCHBC  
 
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GENERAL DIMENSIONS  
UNIT WIDTH MOUNTING WIDTH SUPPLY LOUVERED RETURN LOUVERED FILTER SIZE (INCL)  
MODEL  
A
B
PANEL WIDTH  
C
PANEL WIDTH  
E
3YCHBC  
4YCHBC  
5YCHBC  
6YCHBC  
8YCHBC  
10YCHBC  
13YCHBC  
38  
44  
48  
48  
54  
60  
67  
34  
40  
44  
44  
50  
56  
63  
26  
31-1/2  
37  
31-1/2  
37  
10 X 37 X1  
10 X 43 X1  
10 X 46 X1  
10 X 46 X1  
10 X 53 X1  
10 X 59 X1  
10 X 65 X1  
42-1/2  
42-1/2  
48  
37  
42-1/2  
48  
53  
53  
58-1/2  
10  
YORK INTERNATIONAL  
FORM 115.20-NOM2 (105)  
INSTALLATION  
RECESSED CEILING – MODEL YRHBC  
 
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NOTES:  
1. Telescoping panel allows the cabinet to be installed to within 2  
inches of the ceiling line.  
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All 1-1/2" dia. K.O.;s  
* 4-Pipe system only  
2. Telescoping access panel shipped as seperate item.  
3. YRHBC units are available with filters on units with louvered  
access panels ONLY.  
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LD010220  
GENERAL DIMENSIONS (Inches)  
SUPPLY LOUVERED MOUNTING RETURN  
WIDTH WIDTH OPENING PANEL'WIDTH  
MODEL  
PANEL  
UNIT  
FILTER  
SIZE  
WIDTH  
(H)  
OPENING*  
(I)  
(A)  
41  
47  
51  
51  
57  
67  
70  
(B)  
(C)  
29  
35  
39  
39  
45  
51  
58  
(E)  
(INCL)  
3YRHBC  
4YRHBC  
5YRHBC  
6YRHBC  
8YRHBC  
10YRHBC  
13YRHBC  
38-3/8  
44-3/8  
48-3/8  
48-3/8  
54-3/8  
60-3/8  
67-3/8  
36-5/8  
41-3/4  
47-1/4  
47-1/4  
52-1/2  
57-7/8  
63-1/8  
35  
41  
45  
45  
51  
57  
64  
14  
20  
24  
24  
30  
36  
42  
10 x 37 x 1  
10 x 43 x 1  
10 x 47.5 x 1  
10 x 47.5 x 1  
10 x 53 x 1  
10 x 59 x 1  
10 x 65 x 1  
* Field cut for above ceiling return.  
11  
YORK INTERNATIONAL  
FORM 115.20-NOM2 (105)  
INSTALLATION  
Ceiling Concealed Model with Electric Heat – MODEL YHH  
6
Y
HHS  
-
6.0 - 240 - 3 - RH  
NOM. CFM (100's)  
3,4,6,8,10 or 12  
Coil Connections  
(looking with airflow,  
from blower end)  
RH = Right Hand  
LH = Left Hand  
Unit Style  
Y - basic unit  
YP - with insulated return plenum  
Coil Configuration  
3 = 2 Pipe Coil, 3 Row  
4 = 2 Pipe Coil, 4 Row  
Voltage  
Motor Type  
(1) 240 / 1 / 60  
(2) 208 / 1 / 60  
(3) 277 / 1 / 60  
HH - PSC Motor  
HHS - SP Motor  
Electric Heat (kW)  
6.0 kW  
10.0 kW  
Notes:  
1. Fuse size and wire size per ampacities on unit nameplate.  
Follow NEC guidelines in absence of local codes.  
PHYSICAL DIMENSIONS (INCHES)  
2. YHH units are not available with filters.  
MODEL  
OVERALL MOUNTING  
SUPPLY  
OPENING  
C
WIDTH  
A
WIDTH  
B
3YHHS  
25  
19-11/16  
15  
4YHHS  
6YHHS  
6YHH  
40  
34-11/16  
30  
8YHH  
10YHH  
12YHH  
46  
52  
40-11/16  
46-11/16  
36  
42  
 
 
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12  
YORK INTERNATIONAL  
FORM 115.20-NOM2 (105)  
INSTALLATION  
Ceiling Concealed Model with Electric Heat,  
Insulated Return Plenum and Filter – MODEL YPHH  
 
 
 
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PHYSICAL DIMENSIONS (INCHES)  
MODEL  
OVERALL  
WIDTH  
A
MOUNTING  
WIDTH  
B
SUPPLY  
OPENING  
C
PLENUM  
WIDTH  
D
RETURN  
OPENING  
E
FILTER  
(INCL)  
3YPHHS  
25  
19-11/16  
15  
20  
18  
10 X 20 X 1  
10 X 34 X 1  
4YPHHS  
6YPHHS  
6YPHH  
8YPHH  
40  
34-11/16  
30  
34  
32  
10YPHH  
12YPHH  
46  
52  
40-11/16  
46-11/16  
36  
42  
40  
46  
38  
44  
10 X 40 X 1  
10 X 46 X 1  
YPHH FEATURES:  
1) Return Plenums are insulated.  
2) All plenums include throw away filter.  
13  
YORK INTERNATIONAL  
FORM 115.20-NOM2 (105)  
INSTALLATION  
MODEL YHYB – High Capacity Ceiling Concealed Model  
12 YP HYB - 126 - 3 RH  
NOM. CFM (100's)  
12,16 or 20  
Coil Connections  
(looking with airflow, from blower end)  
RH = Right Hand  
LH = Left Hand  
Unit Style  
Y -high capacity ceiling concealed  
YP - with return plenum & filter  
HYB - Horizontal Blower Coil  
Coil Configuration  
3 = 2 Pipe Coil, 3 Row  
4 = 2 Pipe Coil, 4 Row  
6 = 2 Pipe Coil, 6 Row  
Unit Voltage  
126 - 120V – 1 Ph – 60 Hz  
277 - 277V – 1 Ph – 60 Hz  
31 = 4 Pipe Coil, 3 Row Cool, 1 Row Heat  
32 = 4 Pipe Coil, 3 Row Cool, 2 Row Heat  
41 = 4 Pipe Coil, 4 Row Cool, 1 Row Heat  
42 = 4 Pipe Coil, 4 Row Cool, 2 Row Heat  
61 = 4 Pipe Coil, 6 Row Cool, 1 Row Heat  
62 = 4 Pipe Coil, 6 Row Cool, 2 Row Heat  
Notes: 1. YHYB units are not available with filters.  
2. YPHYB units are provided with filters in the plenum.  
PHYSICAL DIMENSIONS (INCHES)  
MODEL OVERALL  
TOP  
SUPPLY MOUNTING RETURN  
FILTER  
(INCL)  
FEATURES:  
WIDTH  
A
PLATE OPENING  
WIDTH  
D
OPENING  
E
WIDTH  
B
C
1. Manual air vents  
2. 4-speed direct drive motors  
3. 1/2" copper tubing  
4. Primary and secondary condensate  
drains on one end  
5. 120/1/60Hz. motors (2)  
6. 3-row and 6-row models available  
7. Rubber isolation grommets  
8. Insulated and coated drain pan  
___  
12YHYB  
12YPHYB  
16YHYB  
16YPHYB  
20YHYB  
20YPHYB  
41  
41  
51  
51  
60  
60  
35-1/2  
35-1/2  
42-1/2  
42-1/2  
51-1/2  
51-1/2  
28  
28  
38  
38  
47  
47  
31-1/4  
31-1/4  
41-1/4  
41-1/4  
50-1/4  
50-1/4  
23-1/4  
23-1/4  
38-1/4  
38-1/4  
47-1/4  
47-1/4  
14 x 28 x 1  
___  
14 x 38 x 1  
___  
14 x 43 x 1  
 
 
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14  
YORK INTERNATIONAL  
FORM 115.20-NOM2 (105)  
FAN COILS START - UP CHECKLIST  
INSTALL CHECKLIST  
Equipment received as ordered.  
Unit checked for damage interior and exterior.  
Make sure all ductwork is complete and available for full air flow.  
Unit installed level to ensure proper drainage and operation.  
Unit installed with proper clearances.  
Ensure condensate water will drain toward the drain connection. An overflow drain may be required as a back up to a clogged  
primary drain.  
Check that coil(s), valves and piping have been leak checked and insulated as required.  
Main coil drain pan must be properly trapped and charged with water before units are started.  
Ensure that all air has been vented from the system.  
Return valves to their proper operating positions prior to start-up.  
Repair any solder joint leaks and gently tighten any leaking valve packing nuts and piping accessories as required.  
Install all panels.  
NOTE: If the motor and fan have not been operated in the last (4) four weeks or more, lubricate all the bearings and rotate the motor and fan  
monthly to prevent moisture from accumulating in the bearings. (See Form 50.20-NM3, Long Term Storage)  
CLEANING CHECKLIST  
Installer has cleaned out interior.  
Ensure drain pan free from foreign material.  
Ensure air filters are clean, installed properly and secured. Use the directional arrows or other information on the filter to  
determine the proper flow direction.  
CONTROLS CHECKLIST  
Check that supply voltage matches nameplate data.  
Ensure that the unit is properly grounded.  
Controls installation complete  
Check all electrical connections for tightness.  
Review electrical print for correct wiring.  
Fan INSPECTION - The fan should be inspected and cleaned, in conjunction with maintenance of the motor and bearings. It is  
important to keep the wheel clean in order to avoid imbalance and vibration.  
Check tightness of fan bearing locking collar.  
With power off, check blower wheel set screws for tightness and ensure that the blower wheel(s) rotate freely and quietly.  
Check tightness of all motor base and mounting bolts.  
Check motor connections to ensure that they are secure and made in accordance with the wiring diagram  
Rotate all moving components manually. Adjust as required.  
15  
YORK INTERNATIONAL  
 
MAINTENANCE  
MOTOR  
Because of dust and lint in the room, room-air filters  
load up much more rapidly than outdoor-air filters.  
Under normal conditions, the room air filter requires  
replacement every six to eight weeks.  
The blower motor should be cleaned annually and if it  
has oiling ports, it should be oiled with a good grade of  
SAE 20 oil. Normally a few drops of oil in each bearing  
is sufficient.  
To ensure proper maintenance of the filters, it is best  
to follow an organized maintenance procedure. The  
following one is recommended:  
COIL  
Divide the total number of units on the job into six  
equal groups. Each week inspect, clean or replace the  
filters in each group, in rotation. This insures a uniform  
servicing interval. The interval may be lengthened or  
shortened as determined by experience. If inspection  
shows only the room-air filter to be dirty, this one alone  
should be replaced.  
The coil must be kept clean by any of the following  
methods.  
1. Cleaning with low-pressure compressed air.  
2. Flushing or rinsing with water (a detergent is ad-  
visable for greasy surfaces).  
3. Prior to the water system start-up and balancing, the  
chilled/hot water systems should be flushed to clean  
out dirt and debris, which may have accumulated  
during construction. All unit service valves are to  
be closed during this process. Strainers are to be  
installed in the piping mains to prevent this material  
from entering the units during normal operation.  
Dirty filters reduce the air and heat-  
ing capacities of the Unit Ventilator.  
When the filters are excessively dirty,  
the unit heating capacity will be so re-  
duced that it is ineffective for heating  
the room. When a room fails to heat,  
always check the filters.  
FILTERS  
Clean or Replace Air Filters Regu-  
larly  
CLEAN UNIT INTERIOR  
Once a year clean the fans and coils of the unit  
thoroughly. Remove the access panel as necessary.  
Wipe the interior of the unit clean with a rag. Wipe the  
motor and inside and outside of the fan housings. (In  
cooling units, clean out the drain pan.)  
The intervals at which filters require replacement  
depend on local conditions.  
Tele. 800-861-1001  
P.O. Box 1592, York, Pennsylvania USA 17405-1592  
Copyright © by York International Corporation 2004  
Subject to change without notice. Printed in USA  
ALL RIGHTS RESERVED  
Form 115.20-NOM2 (105)  
Supercedes 115.20-NOM2 (904)  
 

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