System Start-Up; Checking System Charge; Servicing And Verify; Recording Total System Charge - York H1TC048 Installation Instructions Manual

035-16408-001 Rev. B (101)
INDOOR BLOWER SPEED SETTINGS
Refer to the Tabular Data Sheet for the recommended air flow
settings for each size condensing unit.
Variable Speed Air Handlers and Furnaces - Set the high
speed cooling speed per the instructions for the air handler or
furnace by selecting the correct "cool" and "ADJ" taps. The
low speed setting will automatically be programmed for the
correct airflow. Verify the airflow by LED display on the speed
selection board.
Single Speed Air Handlers and Furnaces - It is mandatory
a fan relay kit be applied to the furnace or air handler. The air
handlers are designed to use the 2SF06700124 fan relay and
the furnaces should use a SPDT 24VAC Coil (15 AMP rating
@ 115V). See figures 5 and 6 for wiring connections. The
ideal fan setting is to set the high speed (second stage) air
flow at the fan motor high speed and the low speed (first
stage) airflow at the fan low speed. If the low speed air flow is
too high, unsatisfactory dehumidifaction may occur on first
stage operation. To correct for unsatisfactory dehumidifica-
tion, either add a dehumidistat per figures 5 and 6 or change
the blower motor for better air flow performance.
Two Stage Furnaces - The ideal fan setting is to set the high
speed (second stage) air flow at the fan motor high speed
and the low speed (first stage) airflow at the fan low speed. If
the low speed air flow is too high, unsatisfactory dehumidifac-
tion may occur on first stage operation. To correct for unsatis-
factory dehumidification, either add a dehumidistat per figure
7 or change the blower motor for better air flow performance.

SYSTEM START-UP

ENERGIZE CRANKCASE HEATER
This unit is equipped with a crankcase heater for the com-
pressor.
IMPORTANT -
An attempt to start the compressor without
at least 8 hours of crankcase heat will damage the compres-
sor.
In order to energize the crankcase heater, set the indoor ther-
mostat system switch to "OFF". Close (turn on) the line power
disconnect to the unit.

CHECKING SYSTEM CHARGE

This condensing unit must only be used with the matching
thermostatic expansion valve kit listed in the tabular data
sheet. The best way to check the system charge is by check-
ing the system subcooling during the second stage of opera-
tion.
It is unlawful to knowingly vent, release or dis-
charge refrigerant into open air. It is necessary to
recover the refrigerant during any repair or instal-
lation of the system.
10
Refrigerant charging should only be carried out
by a qualified air conditioning contractor.

SERVICING AND VERIFY:

For 2nd stage (2 cylinder) operation, the recommended sub-
cooling is 15°F for all models. For 1st stage (1 cylinder) oper-
ation, the recommended subcooling is 10F for all models.
1. Set the system running in the second stage (2 cylinder
operation) by setting the thermostat at least 6°F below
the room temperature. Short the "TEST" pin to bypass
the 5 minute anti-short cycle timer if necessary. See Fig-
ure 8.
2. Operate the system for a minimum of 15 to 20 minutes.
3. Refer to the tabular data sheet for the recommended air-
flow and verify this indoor air flow (it should be about 400
SCFM per ton).
4. Measure the liquid refrigerant pressure P and tempera-
ture T at the service valve.
5. Calculate the saturated liquid temperature ST from Table
1.
6. Subcooling temperature TC = Saturated Temperature ST
Liquid temp T.
Example: The pressure P and temperature T measured at
the outdoor unit service port is 220 Psig and 95°F. From Table
1 the saturated temperature for 220 Psig is 108. The subcool-
ing temperature TC = 108 - 95 = 13°F.
The recommended subcooling level should be about 15+/
3°F for all models. Add charge if the calculated subcooling
temperature TC in step 6 is lower than the recommended
level. Remove and recover the refrigerant if the subcooling
Temperature TS is higher than the recommended level.
Table 1: R-22 SATURATION TEMPERATURE
1
90 91
ST
2
168 171
P
ST 95 96
P 182 185
ST 100 101
P 196 199
ST 105 106
P 211 214
ST 110 111
P 226 229
ST 115 116
P 243 246
ST 120 121
P 260 263
ST 125 126
P 278 282
ST 130 131
P 297 301
1.
ST = Saturated Temperature
2.
P = Pressure
92 93 94
174 176 179
97 98 99
187 190 193
102 103 104
202 205 208
107 108 109
217 220 223
112 113 114
233 236 239
117 118 119
250 253 256
122 123 124
267 271 274
127 128 129
285 289 293
132 133 134
305 309 313
Unitary Products Group