22
Fig. 36 — Optional or Accessory Electric Heater
Control Connections
(Except CRHEATER128B00-129B00)
CRHEATER128B00-129B00 Only
Connect the ORN lead from Heater Relay 1 (HR1) to ter-
minal TB4-1. For 2 stage heating, connect the VIO lead from
Heater Relay 3 (HR3) to terminal TB4-2. For 1 stage heating
with CRHEATER128B00 or CRHEATER129B00, connect
the ORN lead from HR1 and the VIO lead from HR3 to ter-
minal TB4-1. Connect the BRN lead from HR1 to TB4-3. See
Fig. 37.
Fig. 37 — Optional or Accessory Electric Heater
Control Connections for CRHEATER128B00-129B00
Only
HUMIDI-MIZER
®
CONTROL CONNECTIONS
Humidi-MiZer
®
Space RH Controller
NOTE: The Humidi-MiZer
®
system is a factory-installed option
which is only available for units equipped with belt-drive mo-
tors.
The Humidi-MiZer
®
dehumidification system requires a
field-supplied and field-installed space relative humidity con-
trol device. This device may be a separate humidistat control
(contact closes on rise in space RH above control setpoint) or
a combination thermostat-humidistat control device such as
Carrier’s Edge
®
Pro Thermidistat™ with isolated contact set
for dehumidification control. See Fig. 38 and Fig. 39. The hu-
midistat is normally used in applications where a temperature
control is already provided (units with PremierLink™
control).
Fig. 38 — Accessory Field-Installed Humidistat
Fig. 39 — Edge
®
Pro Thermidistat
To connect 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. 31 on page 20) 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. Use wire nuts to connect humidistat cable to the leads in
the low–voltage wiring (as shown in Fig. 40), connecting
PNK to PNK and PNK/BLK to PNK/BLK.
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
2
3
12
132
TB4
HR2
HR1
Elec Htr
CONTL
BOARD
CTB
Field
Connections
for Field-Installed
Electric Heat
VIO BRN BRNVIO
VIO BRN
VIO BRN
ORN
BRN
VIO
ORN VIO BRN
CTB
CONTL
BOARD
ORN
BRN
Field
Connections
for Field-Installed
Electric Heat
LS: Primary Limit Switch
2
3
12
31
VIO
ORN VIO BRN
BRNVIO
2
TB4
VIO
HR3
HR1
ORN BRN
Elec Htr
ORN
For simplicity, not all control
wiring internal to the electric
heaters is shown.
LS
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