Evacuation; System Charge; Typical Field Wiring (Air Handler / Electrical Heat); Cfm Selection Board - York International CMB SERIES Installation Manual

ALL FIELD WIRING TO BE IN ACCORDANCE WITH ELECTRIC CODE (NEC) AND/OR LOCAL CODES
POWER WIRING
208/230-1-60
GND.
LUG
CONTACTOR
TERMINALS
CONDENSING UNIT
FIGURE 7: Typical Field Wiring (Air Handler / Electrical Heat)
CFM SELECTION BOARD SETTINGS

CFM SELECTION BOARD

TAP SELECTION
D
C
B
A
COOL HEAT ADJ
REMOVE FOR
HEAT PUMP
FIGURE 8: CFM Selection Board
For proper system operation the CFM Selection Board jumpers must be
set properly.
Refer to the Tabular Data Sheet for the recommended air flow settings
for each size condensing unit.
Set the cooling speed per the instructions for the air handler or furnace
by selecting the correct COOL and ADJ taps. Verify the airflow using
the LED display on the CFM selection board.
The HUMIDISTAT jumper must also be removed if a dehumidistat is
installed.
SECTION VI: EVACUATION
It will be necessary to evacuate the system to 500 microns or less. If a
leak is suspected, leak test with dry nitrogen to locate the leak. Repair
the leak and test again.
To verify that the system has no leaks, simply close the valve to the vac-
uum pump suction to isolate the pump and hold the system under vac-
uum. Watch the micron gauge for a few minutes. If the micron gauge
indicates a steady and continuous rise, it's an indication of a leak. If the
gauge shows a rise, then levels off after a few minutes and remains
fairly constant, it's an indication that the system is leak free but still con-
tains moisture and may require further evacuation if the reading is
above 500 microns.
Unitary Products Group
24 VOLT CONTROL WIRING
MINIMUM 18 GA. WIRE
(NEC CLASS 2)
*
TERMINAL W IS ONLY
REQUIRED ON SYSTEMS
WITH HEAT.
COIL
ALL OUTDOOR WIRING MUST BE WEATHERPROOF. USE COPPER CONDUCTORS ONLY.
D
C
B
A
DELAY
HUMIDISTAT
FURNACE OR AIR HANDLER TERMINAL BLOCK
C Y R
Y R
ROOM THERMOSTAT
SECTION VII: SYSTEM CHARGE
The factory charge in the outdoor unit includes enough charge for the
unit and the highest sales volume evaporator. Some indoor coil
matches may require additional charge. See tabular data sheet pro-
vided in unit literature packet for charge requirements.
Do not leave the system open to the atmosphere.
The "TOTAL SYSTEM CHARGE" must be permanently stamped on the
unit data plate.
Total system charge is determined as follows:
1. Determine outdoor unit charge from tabular data sheet.
2. Determine indoor coil adjustment from tabular data sheet.
3. Calculate the line charge using the tabular data sheet if line length
is greater than 15 feet.
4. Total system charge = item 1 + item 2 + item 3.
5. Permanently stamp the unit data plate with the total amount of
refrigerant in the system.
Use the following subcooling charging method whenever additional
refrigerant is required for the system charge. A superheat charging
method is not suitable for TXV equipped systems.
Refrigerant charging should only be carried out by a qualified air
conditioning contractor.
Measurement Method
If a calibrated charging cylinder or accurate weighing device is avail-
able, add refrigerant accordingly.
Compressor damage will occur if system is improperly charged. On
new system installations, charge system per tabular data sheet for
the matched coil and follow guidelines in this instruction.
Check flare caps on service ports to be sure they are leak tight. DO
NOT OVERTIGHTEN (between 40 and 60 inch - lbs. maximum).
163911-UIM-A-0106
POWER WIRING
CONTROL WIRING
FACTORY WIRING
G W
*
G W
7