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LOW-VOLTAGE CONTROL CONNECTIONS
Pull the low-voltage control leads from the heater module —
WHT, VIO and BRN to the 4-pole terminal board TB4 located on
the heater bulkhead to the left of the Heater module. Connect the
WHT lead from Heater circuit 1 to terminal TB4-1. For 2 stage
heating, connect the VIO lead from Heater circuit 2 to terminal
TB4-2. Connect the BRN lead(s) to terminal TB4-3. See Fig. 39.
UCB
2
PNK
3
ORN
TRAN 1
C
ORN
1
TB4
WHT
Field
Connections
Fig. 39 — Accessory Electric Heater Control
Connections
HUMIDI-MIZER
®
CONTROL CONNECTIONS
Humidi-MiZer Space RH Controller
NOTE: The Humidi-MiZer system is a factory-installed option.
The Humidi-MiZer dehumidification system requires a field-
supplied and field-installed space relative humidity control
device. This device may be a separate humidistat control (contact
closes on rise in space RH above control setpoint) or a combina-
tion thermostat-humidistat control device such as Carrier's Edge
Pro Thermidistat™ device with isolated contact set for dehu-
midification control. See Fig. 40 and Fig. 41. The humidistat is
normally used in applications where a temperature control is
already provided (units with SystemVu™ control).
Fig. 40 — Accessory Field-Installed Humidistat
PNK
BRN
2
3
VIO
BRN BRN
Elec Htr
VIO
HR2
BRN
WHT
HR1
BRN
HR1: Heater Circuit 1
HR2: Heater Circuit 2
(if two-circuit module installed)
% RELATIVE HUMIDITY
Fig. 41 — Edge Pro Thermidistat
Connecting the Carrier Humidistat (HL38MG029)
1.
Route the humidistat 2-conductor cable (field-supplied)
through the bushing the unit's louvered end panel.
2.
Route the cable through the snap-in wire tie and up to the web
bushing near the control box.
3.
Feed the cable through the bushing and into the bottom
left side of the control box after removing one of the two
knockouts in the corner of the box. Use a connector to protect
the cable as it enters the control box.
4.
Use the connector and the wire tie to reduce any slack in the
humidistat cable to ensure that it will not be damaged by
contact with the condenser coil.
5.
Connect one of the leads from the 2-conductor cable to the
HUM terminal on the UCB (Unit Control Board). Connect
the other lead to the R terminal on the UCB. See Fig. 42.
Humidistat
®
Fig. 42 — Humidistat Connections to UCB
Connecting the Thermidistat device (33CS2PPRH-01)
1.
Route the Thermidistat multi-conductor thermostat cable
(field-supplied) through the bushing the unit's louvered end
panel.
2.
Route the cable through the snap-in wire tie and up to the web
bushing near the control box.
3.
Feed the cable through the bushing and into the bottom
left side of the control box after removing one of the two
knockouts in the corner of the box. Use a connector to protect
the cable as it enters the control box.
4.
Use the connector and the wire tie to reduce any slack in the
thermostat cable to ensure that it will not be damaged by
contact with the condenser coil.
20
®
Unit Control
Board
C
HUM
G
W2
W1
Y2
Y1
R
Thermostat
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