Installations Requiring An Add-On Txv Kit; Electrical Connections; Heat Protection; Typical Field Wiring - York International CMB SERIES Installation Manual

163911-UIM-A-0106
FIGURE 4: Heat Protection
The evaporator is pressurized.
4. Braze the liquid line to the evaporator liquid connection. Nitrogen
should be flowing through the evaporator coil.
5. Slide the grommet away from the vapor connection at the indoor
coil. Braze the vapor line to the evaporator vapor connection. After
the connection has cooled, slide the grommet back into original
position. Refer to the Tabular Data Sheet for proper vapor line siz-
ing.
6. Protect the vapor valve with a wet rag and braze the vapor line
connection to the outdoor unit. The nitrogen flow should be exiting
the system from the vapor service port connection. After this con-
nection has cooled, remove the nitrogen source from the liquid fit-
ting service port.
7. Replace the Schrader core in the liquid and vapor valves.
8. Go to "SECTION IV" for TXV installation.
9. Leak test all refrigerant piping connections including the service
port flare caps to be sure they are leak tight. DO NOT OVER-
TIGHTEN (between 40 and 60 inch - lbs. maximum).
NOTE: Line set and indoor coil can be pressurized to 250 psig with dry
nitrogen and leak tested with a bubble type leak detector. Then
release the nitrogen charge.
NOTE: Do not use the system refrigerant in the outdoor unit to purge or
leak test.
10. Evacuate the vapor line, evaporator and the liquid line, to 500
microns or less.
11. Replace cap on service ports. Do not remove the flare caps from
the service ports except when necessary for servicing the system.
Do not connect manifold gauges unless trouble is suspected.
Approximately 3/4 ounce of refrigerant will be lost each time a stan-
dard manifold gauge is connected.
12. Release the refrigerant charge into the system. Open both the liq-
uid and vapor valves by removing the plunger cap and with an
allen wrench back out counter-clockwise until valve stem just
touches the chamfered retaining wall. See Page 3 "PRECAU-
TIONS DURING BRAZING SERVICE VALVE".
13. Replace plunger cap finger tight, then tighten an additional 1/12
turn (1/2 hex flat). Cap must be replaced to prevent leaks.
4
Never attempt to repair any brazed connections while the system is
under pressure. Personal injury could result.
See "System Charge" section for checking and recording system
charge.
SECTION IV: INSTALLATIONS REQUIRING
AN ADD-ON TXV KIT
For installations requiring a TXV kit, refer to the Installation Instructions
accompanying the TXV kit.
SECTION V: ELECTRICAL CONNECTIONS
GENERAL INFORMATION & GROUNDING
Check the electrical supply to be sure that it meets the values specified
on the unit nameplate and wiring label.
Power wiring, control (low voltage) wiring, disconnect switches and over
current protection must be supplied by the installer. Wire size should be
sized per NEC requirements.
All field wiring must USE COPPER CONDUCTORS ONLY and be
in accordance with Local, National, Fire, Safety & Electrical Codes.
This unit must be grounded with a separate ground wire in accor-
dance with the above codes.
The complete connection diagram and schematic wiring label is located
on the inside surface of the unit service access panel.
FIELD CONNECTIONS POWER WIRING
1. Install the proper size weatherproof disconnect switch outdoors
and within sight of the unit.
2. Remove the screws at the bottom of the corner cover. Slide corner
cover down and remove from unit. See Figure 5.
3. Run power wiring from the disconnect switch to the unit.
4. Remove the service access panel to gain access to the unit wiring.
Route wires from disconnect through power wiring opening pro-
vided and into the unit control box as shown in Figure 5.
5. Install the proper size time-delay fuses or circuit breaker, and
make the power supply connections.
6. Energize the crankcase heater if equipped to save time by pre-
heating the compressor oil while the remaining installation is com-
pleted.
SERVICE
ACCESS
PANEL
CONTROL
WIRING
POWER
WIRING
FIGURE 5: Typical Field Wiring
CORNER
COVER
Unitary Products Group