MBVC Installation Manual

5
24 VOLT THERMOSTAT WIRING
NOTE: Wire routing must not interfere with the circulator
blower operation or routine maintenance.
The modular blower’s integrated control module provides ter-
minals for “Y1” and “Y2” and “W1” and “W2” thermostat con-
nections. This allows the modular blower to support the sys-
tems shown in the table below. Refer to the following figures
for typical connections to the integrated control module. Ther-
mostat wiring entrance holes are located in the top of the
blower. Wire routing must not interfere with circulator blower
operation or routine maintenance.
NOTE: A removable plug connector is provided with the
control to make thermostat wire connections. This plug may
be removed, wire connections made to the plug, and replaced.
It is STRONGLY recommended that you do not connect
multiple wires into a single terminal. Wire nuts are
recommended to ensure one wire is used for each terminal.
Air Handler Integrated
Control Module
Typical Single-Stage Cool,
Single-Stage Heat Thermostat
Dehumidistat
[Optional]
Remote Condensing Unit
(Single-Stage AC)
NEU
HOT
12RCG
W1 Y1 Y2
O
DEHUM
RCG
W1 Y1
RC
Y
Place Jumper Between Y1
and O for Proper
Dehumidification Operation
and Proper Ramping
Profile Operation
W2
Figure 7-Typical Single-Stage Cooling with Single-Stage
Heating
Air Handler Integrated
Control Module
Typical Two-Stage Cool,
Two-Stage Heat Thermostat
Dehumidistat
[Optional]
Remote Condensing Unit
(Two-Stage AC)
NEU
HOT
12RCG
W1 W2 Y1 Y2
O
DEHUM
RCG
W1 W2 Y1 Y2
RC
Y1 Y2
Place Jumper Between Y1
and O for Proper
Dehumidification Operation
and Proper Ramping
Profile Operation
Figure 8-Typical Two-Stage Cooling with Two-Stage Heating
12RC
A
ir Handler
Integrated Control Module
Typical Single-Stage Cool,
Single-Stage Heat
Heat Pump Thermostat
Dehumidistat
[Optional]
G
W1 W2 Y1 Y2
O
DEHUM
Remote Condensing Unit
(Single-Stage HP)
NEU
HOT
W/E
RCG
Y1
O
RC
W1 Y
O
Figure 9-Typical Single-Stage Heat Pump with Auxiliary/
Emergency Heating
12RC
A
ir Handler
Integrated Control Module
Typical Two-Stage Cool,
Two-Stage Heat
Heat Pump Thermostat
Dehumidistat
[Optional]
G
W1 W2 Y1 Y2
O
DEHUM
Remote Condensing Unit
(Two-Stage HP)
NEU
HOT
W/E
RCG
W2 Y1 Y2
O
RC
W1 Y1 Y2
O
Figure 10-Typical Two Stage Heat Pump heating and
Auxiliary/Emergency Heating
24 VOLT DEHUMIDISTAT WIRING
The optional usage of a dehumidistat allows the modular
blower’s circulator blower to operate at a slightly lower speed
during a combined thermostat call for cooling and
dehumidistat call for dehumidification. This lower blower
speed enhances dehumidification of the conditioned air as it
passes through the AC coil. For proper function, a
dehumidistat applied to this modular blower must operate on
24 VAC and utilize a switch which opens on humidity rise.
To install/connect a dehumidistat:
1. Turn OFF power to modular blower.
2. Secure the dehumidistat neutral wire (typically the white
lead) to the screw terminal marked “DEHUM” on the
modular blower’s integrated control module.
3. Secure the dehumidistat hot wire (typically the black
lead) to the screw terminal marked “R” on the modular
blower’s integrated control module.
4. Secure the dehumidistat ground wire (typically the
green lead) to the ground screw on the modular blower.
NOTE: Ground wire may not be present on all
dehumidistats.
5. Turn ON power to modular blower.
To enable the dehumidification function, move the dehumidi-
fication dipswitch S7 from OFF to ON.
ON
OFF
Move to the
ON position
to enable
dehumidification
S5 S6 S7 S8