Carrier 50MH - Manual (Page 4)

each electric resistance heater. Voltage to unit
during operation must be within ± 10% of voltage
range indicated on nameplate.
Failure due to operation of unit on improper
line voltage constitutes abuse ana is not covered
by Carrier Warranty.
LINE POWER — Bring line power leads from fused
disconnect thru hole provided (Fig. 1) into high
voltage section of control box. Connect line power
leads to Terminals 1 and 2 on Terminal Board 1.
See label diagram and Fig. 7. Aluminum field
wiring may be used when splice connected to
copper pigtails from unit with approved copper to
aluminum splice connectors.
Accessory Electric Fleater(s) — Connect line power
leads from fused disconnect(s) to Terminal Board 2
as shown in Fig. 7. Extend power leads (supplied
with electric heater) from heater thru fan section
and thru hole provided into high voltage section of
control box. Connect leads to Terminal Board 2
(Fig. 6 and 7).
THERMOSTAT’
TERMINAL
BOARD 3
TO
HEATER
FD
TO (-
HEATER <
FD 1-
RED
BLK
—
”0—[ a F
YEL
—
-0—0-
BLU
)
(2
TO
10 Kw
HEATER
1
TO
> 5KW
1 HEATER
FD — Fused Disconnect
______Field Wiring
______Factory-Supplied Wire (Field Connected)
Fig. 7 — Line Power Connections
Evaporator Fan Motor is factory wired for high
speed operation as shown in Fig. 9. If medium or
low speed operation is desired, remove black motor
lead from Contactor Terminal 23 and replace with
blue motor lead for medium speed or red motor
lead for low speed. Tape unused leads separately.
THERMOSTAT LEADS (24 v) are brought thru
hole provided (Eig. 1) into low voltage section of
control box. Connect leads to Terminal Board 3 as
shown in Eig. 8 and 9.
Accessory Electric Heaters — Extend control leads
with plug (supplied with heater) thru fan section
and insert plug into receptacle located on side
panel of control box. See Fig. 6 and 9.
&-
№
&-
-a
-Q
0------------------------------------ a
Connect Terminal G to Terminal 2 for operation with electric
heater or Terminal 3 for operation without electric heater
_____ Field Wiring
*HH01 YA092 thermostat with HH93YZ096 subbase
Fig. 8 — Thermostat Connections
c — Contactor TC — Thermostat, Cooling
Comp — Compressor TDR — Time-Delay Relay
FC — Fan Capacitor (1FM) TH — Thermostat, Heating
FR — Fan Relay Tran — Transformer
IFM — Indoor Fan Motor
LPS
—
Low-Press. Switch — Field Power Wiring
OFM — Outdoor Fan Motor
___
. Field Control Wiring
R — Relay NEC Class 2, 24 v.
RC — Run Capacitor (Dual)
o
SC — Start Capacitor Marked Connections
SFR — Safety Fan Relay O
Unmarked Connections
SR — Start Relay
TB — Terminal Board □ Terminal Board Connections
NOTES
1. To be wired in accordance with NEC and local codes
2 Low-pressure cutout setting 27 0 ± 4 psig.
3. Terminations in junction box suitable for NEC Class 2 control
circuit, at 24 volts
4 Motor provided with inherent thermal protector,
5. Terminal G connects to terminal no 2 for operation with electric
heater.Terminal G connects to terminal no. 3 for operation with­
out electric heater
Fig. 9 — Typical System Wiring Diagram