035-14511-000 REV B (1299)
Unitary Products Group
7
®
9.
Do not remove the flare caps from the service ports
except when necessary for servicing the system.
10. Release the refrigerant charge into the system. Open
both the liquid and vapor valves by removing the plunger
cap and with an allen wrench back out counter-clockwise
until valve stem just touches retaining ring. Release the
refrigerant charge into the system. See "Precautions Dur-
ing Brazing Angle Valves" on page 6.
11. If the refrigerant tubing, indoor evaporator coil or outdoor
condensing unit has developed a leak during shipment,
or was, for any other reason, opened to the atmosphere
for more than four (4) minutes, it is necessary to evacu-
ate the system down to at least 500 microns to eliminate
contamination and moisture in the system.
If a leak is suspected, leak test to locate the leak. To verify
the leak, close the valve to the vacuum pump suction to iso-
late the pump and hold the system under vacuum. If the
micron gauge indicates a steady and continuous rise after a
few minutes, it's an indication of a leak. If the gauge shows a
rise, then levels off after a few minutes and remains fairly
constant, its an indication that the system is leak free, but still
contains moisture and may require further evacuation if the
reading is above 1000 microns.
See "System Start Up" section for checking and record-
ing system charge.
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 to be supplied by the
installer. Wire size should be sized per NEC requirements.
The complete connection diagram and schematic wiring label
is located on the inside surface of the unit electrical box cover
and this instruction.
POWER WIRING
1.
Install the proper size weatherproof disconnect switch
outdoors and within sight of the unit.
2.
Run power wiring from the disconnect switch to the unit.
3.
Remove the control box cover to gain access to the unit
wiring. Route wires from disconnect through power wir-
ing opening provided and into the unit control box as
shown in Figure 6.
4.
Install the proper size time-delay fuses or circuit breaker,
and make the power supply connections.
5.
Energize the crankcase heater to save time by preheat-
ing the compressor oil while the remaining installation is
completed.
Do not connect manifold gauges unless trouble is
suspected. Approximately 3/4 ounce of refrigerant will
be lost each time a standard manifold gauge is con-
nected.
Never attempt to repair any brazed connections while
the system is under pressure. Personal injury could
result.
CAUTIO
WARNI
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 accordance with the
above codes.
FIGURE 6 :
TYPICAL FIELD WIRING
CAUTIO
POWER
WIRING
CONTROL
WIRING
All outdoor wiring must
be weatherproof. Use
copper conductors only.
GROUND
LUG
LOW VOLTAGE
JUNCTION BOX
