Carrier 38AH044-084 User Manual

Page 28

LEGEND

AWG

— American Wire Gage

— Control Relay

— Heating Device

IFC

— Indoor-Fan Contactor

IFR

— Indoor-Fan Relay

kcmil — Thousand Circular Mils
LLS

— Liquid Line Solenoid

NEC

— National Electrical Code

(U.S.A. Standard)

— Heating Relay (field-

supplied 24-v sealed coil,
10 va maximum rating)

— Reversing Valve

— Terminal Block

Factory Wiring
Field Wiring

Internal 33CSUCE-06 relay contacts are rated for 1 amp/24 vac.

*To control heating device and provide automatic indoor-

fan operation on heating.

†Jumper removed only when separate 24-v trans-

former power source is used to power the 33CSUCE-06
relay pack.

**Field-supplied.

NOTES:

1. Liquid line solenoid valve LLS-A is used for so-

lenoid 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 pre-

vents refrigerant migration to the compressor dur-
ing the OFF cycle. It is recommended on all
systems and required on systems where piping
exceeds 75 ft (22.9 m) in length.

3. The 33CSUCE-06 relay pack requires 10 va.
4. Factory wiring is in accordance with NEC; field

modifications or additions must be in compli-
ance with all applicable codes.

5. Wiring for field power supply must be rated

75 C minimum. Use copper, copper-clad alumi-
num, or aluminum conductors. Maximum in-
coming wire size for each terminal block is
500 kcmil.

6. Terminal blocks TB3 and TB4 are for external

field control connections. Control connections
are to be Class 1 wiring.

7. Field-supplied components (IFC, LLS-A, and

LLS-B) must have a maximum sealed coil rat-
ing of 30 va each (0.25 amp at 120 vac and

Fig. 20 — Field Wiring, One 2-Stage Thermostat — 38AH044-084 Dual-Circuit Units

0.13 amp at 230 vac). Thermostats must have a
minimum pilot duty rating of 300 va (2.5 amps at
120 vac and 1.3 amps at 230 vac).

8. Replacement of factory wires must be with type

105 C wire or its equivalent.

9. Field-supplied liquid line solenoid valves installed

at the evaporator are required on all units.

10. Units have 175 va of power available for field-

installed accessories.

11. 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