York 10, 12 manual Refrigerant Valve Operation, Electrical Wiring, Oil Trapping, Power Supply

035-13606-003 Rev. A (202)

REFRIGERANT VALVE OPERATION ELECTRICAL WIRING

All outdoor units are shipped with the service valves in the closed position. After installation of the refrigerant and proper evacuation, make sure that all valves are in the open position and that the caps are securely tightened before turning ON the electrical power to the outdoor unit.

All models in this series have brass service valves. These valves are not back seating. Opening or closing valve does not close service port. Service ports have Schrader valves for gauge connections. Use back-up wrench on valve body when removing cap to open or close the valve. To open, insert hex wrench into stem and back out counter clockwise until stem

just touches retaining ring.

If the valve stem is backed out beyond the retain- ing ring, system pressure could force the stem out of the valve body and possibly cause per- sonal injury. In the event that the retaining ring is missing do not attempt to open the valve.

Some units may have factory installed 1-1/8" ball valves. To open the valve, remove the brass valve stem cap, located on the side of the valve, with an adjustable wrench. Next, turn the valve stem 1/4 turn CCW (away from unit).

All caps must be replaced to prevent leaks.

Replace valve cap finger tight, then tighten an additional 1/6 of a turn with a wrench, using a back-up wrench on the valve body.

OIL TRAPPING

When the outdoor unit is above the indoor coil oil trapping is necessary. Please refer to APPLICATION DATA, 690.01- AD1V (1296) and worksheet 690.01-AD1.1V (791) “General Piping Recommendations and Refrigerant Line length".

Check the system for correct charge after all components of the system have been installed, connected and wired cor- rectly.

Connect service gauges to low pressure port and discharge service ports.

Allow unit to operate until system pressures and tempera- tures have stabilized, making sure that the pressure and tem- perature align with unit service data. If not, check system charge and adjust if necessary.

To prevent electrical shock, open remote discon- nect so electrical supply to outdoor unit is shut off. Contactor does not open both sides of the 208/230 volt electrical circuit.

POWER SUPPLY

All wiring must comply with N.E.C. and local codes. See rat- ing plate and product data sheet for volts, frequency, phase, maximum fuse size and minimum branch circuit ampacity.

Refer to the wiring diagram inside the unit control box cover before connecting to power supply.

1.The 208/230 volt single phase line voltage service wiring for the outdoor unit must include a disconnect switch located within sight of the outdoor unit.

2.Use the correct size fuse or circuit breaker as listed on the unit rating plate and data sheet. If using nonmetallic- sheathed cable (NM or NM-B) ampacities shall be that of 60° C conductors per N.E.C 336-26.

3.Wiring connections. - Two are provided in the control box:

a.One for low voltage wiring.

b.One entrance for high voltage L1 and L2.

The adjustable High Voltage Conduit Plate is factory installed for 1/2" conduit connections. For 3/4" conduit, remove the screw holding the plate in place and adjust the location of the holes. For 1" conduit, remove the conduit plate and discard. Re-install screw to maintain the integrity of the unit structure, regardless of the conduit being used. See Figures 9, 10 & 11.

4.Power connection to the unit is facilitated by screw termi- nals, L1 and L2 on the outdoor unit contactor. See Fig- ures 9, 10 & 11.

5.Ground the outdoor unit using the ground lug provided. Unless the outdoor unit is grounded through proper wir- ing to the service entrance ground, a suitable separate ground should be provided at the outdoor unit.

6.Use copper conductors only.

Casing or cabinet must be permanently grounded in accordance with National Electric Code or other applicable local codes.

6 Unitary Products Group