Carrier WeatherMaster 50HC04 Service And Maintenance Instructions page 23

LOW-VOLTAGE CONTROL
EXCEPT CRHEATER128B00-129B00)
Pull the low-voltage control leads from the heater module(s) —
VIO and BRN (two of each if two modules are installed; iden-
tify for module no. 1) — to the 4-pole terminal board TB4 lo-
cated on the heater bulkhead to the left of heater 1. Connect the
VIO lead from heater to terminal TB4-1. Connect the VIO lead
from heater 2 to terminal TB4-2. Connect both BRN leads to
terminal TB4-3. See Fig. 44.
Fig. 44 — Accessory Electric Heater Control
Connections (HP-2, Size 06, 575V Only)
LOW-VOLTAGE CONTROL CONNECTIONS (CRHEATER
128B00-129B00)
Pull the low-voltage control leads from the heater module(s) —
ORN, VIO and BRN — to the 4-pole terminal board TB4 lo-
cated on the heater bulkhead to the left of heater 1. Connect the
ORN lead to terminal TB4-1. Connect the VIO lead to terminal
TB4-2. Connect the BRN lead to terminal TB4-3. See Fig. 45.
The 50HC units use a various number of control wires, colors,
and terminal boards depending on voltage and unit size. See
Fig. 46-48 and the unit wiring diagram for proper placement.
CONNECTIONS (ALL
LCTB
CONTL
BOARD
2
VIO
3
ORN
12
BRN
ORN
TB4
ORN
Field
Connections
For simplicity, not all control
wiring internal to the electric
heaters is shown.
Fig. 45 — Accessory Electric Heater Control
Connections (AC-1 Size 08-14, AC-2 Size 08-12)
(CRHEATER128B00, 129B00 only)
DEFROST
BOARD
E-HEAT ORN
P3-3 BRN
ORN
1
TB4
VIO
Field
Connections
Fig. 46 — Accessory Electric Heater Control
Connections (HP-1 Except Size 12 and 121, HP-2
Except Size 12)
23
BRN
VIO
1 2 3
VIO BRN
Elec Htr
VIO
HR3
ORN
HR1 BRN
LS: Primary Limit Switch
BRN
3
VIO BRN BRN
Elec Htr
VIO HR2 BRN
VIO HR1 BRN
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)