Defrost Initiate Curves; System Operation; Instructing The Owner; Saturated Properties - York YMB SERIES Installation Manual

SECTION VIII: SYSTEM OPERATION
For more information on the control operation, refer to "Operation
Instructions - DEMAND DEFROST CONTROL BOARD in this Booklet.
REQUIRED CONTROL SETUP
IMPORTANT: The following steps must be taken at the time of
installation to insure proper system operation.
1. Consult system wiring diagram to determine proper wiring for
proper system configuration.
2. If hot heat pump configuration is desired, change HOT HEAT
PUMP jumper to ON position.
3. If installation includes a fossil fuel furnace, change FFUEL jumper
to ON position.
4. Set low temperature cutout (LTCO) and balance point (BP) jump-
ers as desired.
5. Verify proper system functionality. Confirm room thermostat opera-
tion including fault code display capability.
6. Upon completion of installation, verify that no fault codes are
stored in memory. Clear the fault code memory if necessary.
DEFROST OPERATION
The following defrost curve selection jumper positions are set from fac-
tory.
TABLE 1: Defrost Initiate Curves
Defrost Curve Selection
Jumper Position
Heat Pump Model
INDICATIONS OF PROPER OPERATION
Cooling
Cooling operation is the same as any conventional air conditioning unit.
1. The outdoor fan should be running, with warm air being dis-
charged from the top of the unit.
2. The indoor blower (furnace or air handler) will be operating, dis-
charging cool air from the ducts. Coils or other parts in the air cir-
cuit should be cleaned as often as necessary to keep the unit
clean. Use a brush, vacuum cleaner attachment, or other suitable
means.
3. The vapor line at the outdoor unit will feel cool to the touch.
4. The liquid line at the outdoor unit will feel warm to the touch.
Heating
Indications of proper Heating operation is as follows:
1. The outdoor fan should be running, with cool air being discharged
from the top of the unit.
TABLE 2: R-22 Saturated Properties
Pressure Pressure
Temp °F
PSIG PSIG
80 48 110
82 49 112
84 50 114
86 51 116
88 52 118
90 54 120
92 55 122
94 56 124
96 57 126
98 58 128
100 59 130
102 60 132
104 61 134
106 62 136
108 63 138
Unitary Products Group
1 2 3
2-Ton 4-Ton 3-Ton
2.5-Ton 5-Ton 3.5-Ton
Pressure
Temp °F
PSIG
64 140
65 142
66 144
67 146
68 148
69 150
70 152
71 154
72 156
73 158
74 160
75 162
76 164
77 166
78 168
2. The indoor blower (furnace or air handler) will be operating, dis-
charging warm air from the ducts.
3. The vapor line at the outdoor unit will feel warm to the touch.
4. The liquid line at the outdoor unit will feel cool to the touch.
SECTION IX: INSTRUCTING THE OWNER
Assist owner with processing warranty cards and/or online registration.
Review Owners Guide and provide a copy to the owner and guidance
on proper operation and maintenance. Instruct the owner or the opera-
tor how to start, stop and adjust temperature setting.
When applicable, instruct the owner that the compressor is equipped
with a crankcase heater to prevent the migration of refrigerant to the
compressor during the "OFF" cycle. The heater is energized only when
the unit is not running. If the main switch is disconnected for long peri-
ods of shut down, do not attempt to start the unit until 8 hours after the
switch has been connected. This will allow sufficient time for all liquid
refrigerant to be driven out of the compressor.
The installer should also instruct the owner on proper operation and
maintenance of all other system components.
MAINTENANCE
1. Dirt should not be allowed to accumulate on the outdoor coils or
other parts in the air circuit. Clean as often as necessary to keep
the unit clean. Use a brush, vacuum cleaner attachment, or other
suitable means.
4
2. The outdoor fan motor is permanently lubricated and does not
require periodic oiling.
1.5-Ton
3. If the coil needs to be cleaned, it should be washed with Calgon
Coilclean (mix one part Coilclean to seven parts water). Allow
solution to remain on coil for 30 minutes before rinsing with clean
water. Solution should not be permitted to come in contact with
painted surfaces.
4. Refer to the furnace or air handler instructions for filter and blower
motor maintenance.
5. The indoor coil and drain pan should be inspected and cleaned
regularly to prevent odors and assure proper drainage.
IT IS UNLAWFUL TO KNOWINGLY VENT, RELEASE OR DIS-
CHARGE REFRIGERANT INTO THE OPEN AIR DURING
REPAIR, SERVICE, MAINTENANCE OR THE FINAL DIS-
POSAL OF THIS UNIT.
WHEN THE SYSTEM IS FUNCTIONING PROPERLY AND
THE OWNER HAS BEEN FULLY INSTRUCTED, SECURE
THE OWNER'S APPROVAL.
Pressure
Temp °F Temp °F
PSIG
78 170 91
79 172 91
80 174 92
81 176 93
82 178 94
83 180 94
84 182 95
84 184 96
85 186 97
86 188 97
87 190 98
88 192 99
88 194 99
89 196 100
90 198 101
361813-UIM-A-0208
Pressure Pressure
Temp °F
PSIG PSIG
200 101 230
202 102 232
204 103 234
206 103 236
208 104 238
210 105 240
212 105 242
214 106 244
216 107 246
218 107 248
220 108 250
222 109 252
224 109 254
226 110 256
228 111 258
Temp °F
111
112
112
113
114
114
115
115
116
117
117
118
118
119
119
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