Carrier 38AH044-134 User Manual
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NOTES:
1
Liquid line soienoid vaive LLS-A is used for solenoid
drop on circuit A. Liquid line solenoid valve LLS-B is
used for solenoid drop for circuit B.
2 Solenoid drop is a safety feature which prevents refrig
erant migration to the compressor during the OFF cycle.
It is recommended on all systems and required on sys
tems where piping exceeds 75 ft (22 9 m) in length.
3 The TSR-01 relay pack requires 10 va.
4
Factory wiring is in accordance with NEC; field modi
fications or additions must be in compliance with all ap
plicable codes.
5
Wiring for field power supply must be rated 75 0 mini
mum. Use copper, copper-clad aluminum, or alumi
num conductors. Maximum incoming wire size for each
ferminal block is 500 kcmil.
6 Terminal blocks TB3 and TB4 are for external field con
trol connections Control connections are to be class 1
wiring
10
Field-supplied components (IFC, LLS-A, and LLS-B) must
have a maximum sealed coil rating of 30 va each (0.25
amp at 120 vac and 0 13 amp at 230 vac) Thermo
stats must have a minimum pilot duty rating of 300 va
(2 5 amps at 120 vac and 1 3 amps at 230 vac)
Replacement of factory wires must be with type 105 C
wire or its equivalent
Field-supplied liquid line solenoid valves installed at the
evaporator are required on all units
Units have 175 va of power available for field-installed
accessories
To minimize voltage drop, the following wire sizes are
recommended:
LENGTH —
Ft(M)
INSULATED WIRE — AWG
(35 C Minimum)
Up to 50
(15.2)
No 18
50-75
(15.2-22.9)
No 16
More Than 75
(22.9)
No 14
LEGEND
AWG
— American Wire Gage
C
— Compressor Contactor
CR
— Control Relay
HD
— Heating Device
IFC
— Indoor-Fan Contactor
IFR
— Indoor-Fan Relay
kcmil
— Thousand Circular Mils
LLS
— Liquid Line Solenoid
NEC
— National Electrical Code
(US.A Standard)
R
— Heating Relay (field-
supplied 24-v sealed coil,
10 va maximum rating)
RV
— Reversing Valve
SDR
— Solenoid Drop Relay
TB
— Terminal Block
TR
— Timer Relay
Factory Wiring
________Field Wiring
Fig. 20 — Field Wiring, One 2-Stage Thermostat — 38AH044-084 Duai-Circuit Units
28