Carrier 38QF - Manual (Page 5)

Table 4 — Electrical Data (60 Hz)
OPER COMPR BRANCH CIRCUIT
UNIT
38QF
V/PH
VOLTAGE* FAN
FLA
Min Wire
Max Wire Min Gnd
Max Fuse or
HACR Type
Ckt Bkr Amps**
MCA
Max Min LRA RLA (AWG)t
(ft) Wire Size$
018 230/1 50 10.8 14 30 14 25 14.6
024 54 13.0 12 41 12 30 17.3
030
208-230/1
254 197 69 17.7 1.1 10 48 10 40 23.1
036 75 16.8 10 50 10 35 22.0
042 90 20.0 10 43 10 45 26.0
048
060
230/1 254 207
101
130
21.2
28.6
1.7
10
8
39
46
10
10 45
60 28.1
37.5
AWG — American Wire Gage
FLA — Full Load Amps
HACR — Heating, Air Conditioning and Refrigeration
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
RLA — Rated Load Amps
*Permissible limits of the voltage range at which the unit will
operate satisfactorily.
tCopper wire sizes based on 60 C. Use copper wire only.
fRequired when using nonmetallic conduit.
**Time-delay fuse
When making electrical connections, provide
clearance at unit for refrigerant piping connections.
See Table 4 for recommended wire and fuse sizes.
INSTALL A BRANCH CIRCUIT DISCONNECT
PER NEC of adequate size to handle unit starting
current. Provide a separate disconnect for outdoor
unit, indoor unit and for each accessory electric
heater circuit as required. (See Indoor Unit and
Electric Heater Installation, Start-Up and Service
Instructions.) Locate disconnect(s) within sight
from and readily accessible from the unit; per sec­
tion 440-14 of National Electrical Code (NEC).
ROUTE LINE POWER LEADS INTO UNIT —
Extend leads from disconnect thru power wiring
hole provided (see Fig. 1) and into unit splice area.
Remove top cover to gain access to unit wiring.
CONNECT GROUND LEAD AND POWER
WIRING — Connect ground lead to a ground lug in
control box for safety. Then connect power wiring.
See Fig. 4. Splice line power leads to yellow and
black pigtails. Use wire nuts and tape at each con­
nection. Connect unit wiring to copper wire only.
SEE INDOOR UNIT AND ELECTRIC HEATER
INSTALLATION, START-UP AND SERVICE
INSTRUCTIONS for line power wiring details. All
control wiring is shown in this booklet.
CONNECT CONTROL POWER WIRING (24 V)
— Extend wiring thru hole provided (Fig. 1) and
into low-voltage section of unit control ring.
Connect leads to control wiring terminal board as
shown in Fig. 5.
Use indoor unit transformer as 24-v supply for
system. At least a 60-va transformer is recom­
mended. Carrier approved indoor units are equipped
with a 60-va transformer. See indoor unit data.
Use Carrier accessory indoor thermostat with
subbase, Table 3.
START-UP
The 38QF unit is equipped with a crankcase
heater. It is recommended that heater be energized a
minimum of 24 hours before starting unit. To ener­
gize heater only, turn the thermostat to OFF posi­
tion and close electrical disconnect to heat pump.
Heat Anticipator Settings for Room Thermo­
stat (HH07AT171) — Set anticipator settings for
room thermostat according to Table 5. These set­
tings may be changed slightly to provide a greater
degree of comfort for a particular installation.
1 PHASE
CONN. TO -
DISCONNECT
PE.R NEC
--------------- GROUND _EAD-|(^ GROUNDING LUG
-BLK-------------
.<1
Splicii Cfjnnpctions
_______Field '.Virinq
_______ Fditory Wiiinq
I-PHASE
rCND UNIT
Fig. 4 — Line Power Connections
Table 5 — Thermostat Anticipator Settings
UNIT
38QF
018
024
030
036
042
048
060
FIRST-
STAGE
ANTICIPATOR
SETTING
INDOOR
UNIT WITH
ELECTRIC
HEATER
HTR
KW
SECOND-
STAGE
ANTICIPATOR
SETTINGS
Fixed
40AQ Fan Coil
with 40AQ Htrs
or 40QB/QH Fan Coil
with 40QB Htrs
5.0
7.5
10.0
.25
15.0
20.0
25.0
.50
30.0
34.0
.75