Carrier 38AD - Remote Control Wiring Options; Line Voltage Remote Control Setup; Low-Voltage Remote Control Setup; Unit Start-Up Procedures

Table 7 — Maximum Field Wire Sizes
UNIT
SIZE
VOLTS
(60-Hz)
WIRE SIZE
CONN.
38AD
024,028/034
208
230
6 AWG to 350 MCM
TB
460
575
14 AWG to 2/0
044
460
575
208
230
6 AWG to 350 MCM I
TB
CT
38AB
054,064
208
230
6 AWG to 350 MCM
CT
460
575
6 AWG to 3/0
084
All
6 AWG to 350 MCM
CT
CT - Compression Terminal (attached to terminal block)
TB — Terminal Block (with integral compression terminal)
TB
DT---
0 ---
0 -- -
0 ---
0
0 -
-T
I
-I -
I
_-4
TC|
TC;2*^0-
'i s, fea-
-- L - 2 %X3
TWO STEP COOLING
38AB054, 064 AND 084
_I
LEGEND
CR — Control Relay TC — Thermostat, Cooling
LLS — Liquid Line Solenoid -Field Wiring
TB — Terminal Board (at unit) *Field Supplied
Fig. 10 — Control Circuit Wiring with Line Voltage
(115, 208- or 230-volt) Thermostat
LINE VOLTAGE REMOTE CONTROL - Install
field-supplied line voltage thermostat(s) as shown
in Fig. 10 for two-step cooling. Wire liquid line
solenoid as shown.
LOW-VOLTAGE REMOTE CONTROL - Install
field-supplied accessories as shown in Fig. 11 or
Fig. 12 for either two-step cooling or two-step
cooling, one-step heating. Wire liquid line solenoids
as shown.
START-UP
Preliminary Checks
-> 1. Compressor oil level must be visible at sight
glass in each compressor crankcase. Add oil if
necessary.
2. Each compressor must float freely on its
mounting springs.
3. All internal wiring connections must be tight,
and all barriers and covers must be in place.
-> Toggle switches for units 38AB054,064 and 084
must be in “On” position.
4. Electrical power source must agree with unit
nameplate rating.
5. All service valves must be open.
6. Fan cycling thermostat sensing bulb must be in
air stream under fan no. 1.
7. Crankcase heater must be firmly locked into
the compressor crankcase.
Leak Test the entire refrigerant system by the
Pressure Method described in the Carrier Standard
Service Techniques Manual, Chapter 1, Section 1-6.
Use R-22 at approximately 25 psig backed up with
an inert gas to a total pressure not to exceed 245
psig.
Evacuate and Dehydrate the entire refrigerant
system by either of the methods described in the
Carrier Standard Service Techniques Manual,
Chapter 1, Section 1-7.
Li
38A B , 0 5 4,0 6 4, 084,
SDRl
>-2l
(IMS)
-
SR|
—' p-6
i(0-OH-
l ONE “ STEP
HEATING
CONTROLS
THERMOSTAT HH07AT072
SUBBASE HH93AZ080
LEGEND
AHA — Adjustable Heat
Anticipator
CC — Cooling Compensator
CR — Control Relay
HD — Heating Device
IFR — Indoor Fan Relay
IMS — Indoor Motor Starter
LLS — Liquid Line Solenoid
R — Relay (Accessory)
SDR - Solenoid Dropping Relay
SR — Solenoid Relay
TB — Terminal Board
TC — Thermostat, Cooling
TH — Thermostat, Heating
- Factory Wired
-Field Wired
| | Terminal Board Conn.
at Unit
^Field Supplied
Fig. 11 - Control Circuit Wiring with
24-Volt Accessories (38AB Units Only)
7
772