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Low-Voltage Control Connections
All units except size 06, 575V:
Pull the low-voltage control leads from the heater mod-
ule(s) — VIO and BRN (two of each if two modules are in-
stalled; identify for Module #1) — to the 4-pole terminal
board TB4 located on the heater bulkhead to the left of
Heater #1. Connect the VIO lead from Heater #1 to terminal
TB4-1. For 2 stage heating, connect the VIO lead from
Heater #2 to terminal TB4-2. For 1 stage heating with 2
heater modules, connect the VIO lead from both Heater #1
and #2 to terminal TB4-1. Connect both BRN leads to ter-
minal TB4-3. See Fig. 32.
CTB
CONTL
BOARD
2
VIO
3
ORN
12
BRN
ORN
1
TB4
VIO
Field
Connections
for Field-Installed
Electric Heat
Fig. 32 — Accessory Electric Heater Control
Connections (All Units Except Size 06, 575V),
2 Stage Heat Shown
Size 06, 575V units only:
Pull the low-voltage control leads from the heater mod-
ule(s) — VIO, WHT and BRN (two of each if two modules
are installed; identify for Module #1) — to the 4-pole termi-
nal board TB4 located on the heater bulkhead to the left of
Heater #1. Connect the WHT lead from Heater #1 to TB4
where ORN is. For 2 stage heating, connect the VIO lead
from Heater #2 to the terminal that has VIO from the unit.
For 1 stage heating with 2 heater modules, connect the VIO
lead from Heater #2 to the same terminal with WHT lead
from Heater #1 (see Fig. 33).
PERFECT HUMIDITY™ CONTROL CONNECTIONS
Perfect Humidity Space RH Controller
NOTE: Perfect Humidity is a factory-installed option which is
only available for units equipped with belt-drive motors. The
Perfect Humidity system is not available for single phase (-J
voltage code) models.
The Perfect Humidity 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 combination thermostat-humidistat control
device with isolated contact set for dehumidification con-
trol.
VIO
BRN
2
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)
CONTROL
BOARD
12
2
3
ORN
Field Connections
for Field Installed
Electric Heat
Fig. 33 — Accessory Electric Heater Control
Connections (Size 06, 575V Only),
2 Stage Heat Shown
To connect a field-supplied humidistat:
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. 27) 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-volt-
age wiring.
3.
Use wire nuts to connect humidistat cable to two PINK
leads in the low-voltage wiring as shown in Fig. 34.
To connect a field-installed programmable thermostat:
1.
Route the Programmable Thermostat multi-conductor
cable (field-supplied) through the hole provided in the
unit corner post.
2.
Feed wires through the raceway build into the corner
post (see Fig. 27) 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-volt-
age wiring.
3.
The Programmable Thermostat has dry contacts at ter-
minals D1 and D2 for dehumidification operation (see
Fig. 35). The dry contacts must be wired between CTB
terminal R and the PINK lead to the LTLO switch with
field-supplied wire nuts. Refer to the installation
instructions included with the Programmable Thermidi-
stat device for more information.
CONTROL AND POWER WIRING DIAGRAMS
Figures 36-40 are typical control and power wiring diagrams.
19
TO 24V TRANS
BRN
VIO
RED
TB4
BRN
BRN
RED
LS
VIO
HCR2
HC2
WHT
HCR1
HC1
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