21
Connecting the Carrier Humidistat (HL38MG029)
1. Route the humidistat 2-conductor cable (field-supplied)
through the hole provided in the unit corner post.
2. Feed wires through the raceway built into the corner post
(see Fig. 35) to the 24v barrier located on the left side of
the control box. The raceway provides the UL-required
clearance between high-voltage and low-voltage wiring.
3. 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. 38.
Fig. 38 — Humidistat Connections to UCB
Connecting the Thermidistat device (33CS2PPRH-01)
1. Route the Thermidistat multi-conductor thermostat cable
(field-supplied) through the hole provided in the unit cor-
ner post.
2. Feed wires through the raceway built into the corner post
(see Fig. 35) to the 24-v barrier located on the left side of
the control box. The raceway provides the UL-required
clearance between high-voltage and low-voltage wiring.
3. The Thermidistat has dry contacts at terminals D1 and D2
for dehumidification operation (see Fig. 39). Connect D1
to the R terminal on the UCB. Connect D2 to the HUM
terminal on the UCB. Refer to the installation instructions
included with the Carrier Edge
®
Pro Thermidistat device
for more information.
TYPICAL UNIT WIRING DIAGRAMS
See Fig. 40 - 42 for examples of typical unit control and power
wiring diagrams. These wiring diagrams are mounted on the
inside of the unit control box cover.
Fig. 39 — Typical Rooftop Unit with Humidi-MiZer Adaptive Dehumidification System
and Edge
®
Pro Thermidistat Device
HUMIDISTAT
UNIT CONTROL
BOARD
THERMOSTAT
C
HUM
G
W2
W1
Y2
Y1
R
Rc
Rh
W1
G
Y2
C
O/W2/B
Y1
OAT
RRS
SRTN
HUM
D1
D2
V+
Vg
C
HUM
G
W2
W1
Y2
Y1
R
PROGRAMMABLE
THERMOSTAT
UNIT CONTROL BOARD
THERMOSTAT CONNECTIONS