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Site Preparation and Installation
20
2.5.3 Piping Connections
Details for refrigerant (R-22) loop piping are in 2.4.3 - Piping Connections and Coolant Require-
ments.
Figure 12 Piping connections - indoor air-cooled centrifugal fan condensing unit
2.5.4 Electrical Connections - Condensing Unit
Refer to 2.4.4 - Electrical Connections, Evaporator or Chilled-Water Unit and Figure 14 for
general wiring requirements and cautions. Refer to electrical schematic when making connections.
Refer to unit serial tag for full load amp and wire size amp ratings.
Power Connections
The condensing unit requires its own power source and earth ground, with a disconnect switch to iso-
late the unit for maintenance.
Control Connections
Field-supplied control wires must be connected between the evaporator and the condensing unit (See
Figure 14 and the electrical schematic on the units for more details.) Seven (7) wires are required
between the evaporator and condensing unit. Eighth and ninth wires are required on systems with
hot gas bypass.
NOTE
Refer to serial tag for full load amp and wire size amp ratings
Condenser Coil
High Pressure
Switch
Scroll
Compressor
Hot Gas Bypass
Solenoid Valve
Hot Gas Bypass
Control Valve
3 - Way Head
Pressure
Control Valve
Check
Valve
3/8" (9.5mm) FLR
Pressure Relief Valve
Sight Glass
Lee - Temp
Receiver
Liquid Line
Solenoid Valve
Liquid Injection
Valve Bulb
Suction Line Male Quick
Connect Coupling
Liquid Inject
ion
Valve
Liquid Line Male Quick
Connect Coupling
Suction Line Female Quick
Connect Coupling
Liquid
Line Female Quick
Connect Couplin
g
Service Access
Ports
Expansion Valve
Sensing Bulb
External Equalizer
Evaporator Coil
Filter
Drier
Receiver Heater
Pressure Limiting
Switch
Pressure Balancing
Valve
*
*
(Two circuits required, single circuit shown for clarity)
DPN000236_Rev0