Heating —
If heating is desired, a heating/cooling ther-
mostat (See Fig. 5-7) must be supplied. This thermostat en-
ergizes a field-supplied relay, which operates heating con-
trols and energizes the indoor-fan relay. When the fan switch
is set at AUTO, the indoor-air fan cycles with the heating
control. The indoor-air fan runs continuously when the fan
switch is set at CONT.
Fan Cycling —
Fan cycling is employed for head pres-
sure control. The no. 2 fan responds to liquid line pressure,
cycling on at approximately 260 psig (1793 kPa) and off at
approximately 126 psig (869 kPa).
Winter Start Control (If Required) —
Install
Accessory Package 38AE900021. See page 9 for further details.
LEGEND (Fig. 1-5, 14, 15)
NOTES (Fig. 1-4)
1. Fan motor(s) are thermally protected. Compressor motors
are protected against primary single-phasing conditions.
2. If any of the original factory installed wire must be
replaced, it must be replaced with type 90 C wire or its
equivalent.
3. Terminal block 2 (TB2) is for field external control
connections, Class 2 wiring:
Supply voltage at TB2 is 24 vac
Maximum power available at TB2 is 31.5 va
4. Field-supplied component ratings:
IFC sealed coil rating (24 vac) 12 va maximum.
For 24-1-50:
LLS sealed coil rating (24 vac) 23 va maximum.
For 24-1-60:
LLS sealed coil rating (24 vac) 18 va maximum.
Minimum thermostat electrical rating is 120 va (5 amp at
24 vac).
Minimum fan switch electrical rating is 60 va (2.5 amp
at 24 vac).
If two liquid line solenoid valves are used, add accessory
relay transformer package 38AE900001 (60 Hz only).
5. LLS, controlled by TC2, activates one-half of evaporator
for capacity control feature.
6. Use copper, copper-clad aluminum, or aluminum con-
ductors for field power supply.
7. Insulate unused lead when changing tap for 208 v use.
8. For field wiring, use 60 C rated wire.
C
— Contactor, Compressor
CAP
— Capacitor
CB
— Circuit Breaker
CH
— Crankcase Heater
COM
— Common
COMP
— Compressor
CR
— Control Relay
Du
— Dummy Terminal
Equip Gnd — Equipment Ground
FCPS
— Fan Cycling Pressure Stat
FU
— Fuse
HD
— Heating Device
HPS
— High-Pressure Switch
IFC
— Indoor-Fan Contactor
IP
— Internal Protector
LLS
— Liquid Line Solenoid
LLSV
— Liquid Line Solenoid Valve
LPS
— Low-Pressure Switch
NEC
— National Electrical Code
OFC
— Outdoor-Fan Contactor
OFM
— Outdoor-Fan Motor
OFR
— Outdoor-Fan Relay
TB
— Terminal Block
TC
— Thermostat-Cooling
TDR
— Time Delay Relay
TGD
— Time Guard® Circuit
TRAN — Transformer
QT
— Quadruple Terminal
Terminal Block Connection
Terminal (Unmarked)
Terminal (Marked)
Field Splice
Splice (Marked)
Factory Wiring
Factory Splice
Field Control Wiring
Field Power Wiring
To indicate common potential only,
not to represent wire.
2
Summary of Contents for 38AKS013-024
Page 3: ...Fig 1 Power and Control Circuit Schematics 208 230 380 3 60 230 346 400 3 50 SCHEMATIC 3...
Page 4: ...Fig 2 Component Arrangement 208 230 380 3 60 230 346 400 3 50 COMPONENT ARRANGEMENT 4...
Page 5: ...Fig 3 Power and Control Circuit Schematics 460 575 3 60 SCHEMATIC 5...
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