Instructions / Assembly

4
**To use the HVAC transformer to power humidification/dehumidification switch HM/DHM
switches to “SYS” position: - Connect humidifier to HM - Connect dehumidifier to DHM If humidifier or dehumidifier has a separate transformer switch HM or DHM switch to “DRY” position: - Connect humidifier to HM and HM2 (or) - Connect dehumidifier to DHM and DHM2
* For two transformer system, cut and tape off one transformer. If
transformer safety circuits are only in one of the systems, remove the transformer of the system with NO safety circuits. If required, replace remaining transformer with a 75 VA Class II transformer. After
disconnecting one transformer, the two commons must be jumpered together.
DHM2 DHM HM2 HM LSYSTEM
W/E
W2
Y
Y2
G
O/B
POWER
RC
Status/Fault
7-Segment LED
LED On/Off
Return Air Duct Sensor Socket
Connect
**HM Switch
**DHM Switch
Outdoor Condenser (A/C or Heat Pump)
Y
Y2
O/B
C
(if Heat Pump)
DHM
DHM2
HM2
W/E
W2
Y
Y2
G
O/B
L
HM
Indoor Air Handler/Furnace Connections
Heat Stage 1 - Indoor Unit or Furnace (Conventional Gas, Oil, Elec) or HP 1 Stage Aux/Em
Heat Stage 2 - Indoor Unit or Furnace (Conventional Gas, Oil, Elec) or HP 2 Stage Aux/Em
Stage 1 - Outdoor Condenser (Conventional or HP)
Stage 2 - Outdoor Condenser (Conventional or HP)
Fan Relay
Changeover Relay Heat Pump
Comfort Alert Connection
R
C
24 VAC Transformer Hot
24 VAC Transformer Neutral
Dehumidification Relay / Connection
Dehumidification Relay / Connection (for dry contacts) Humidification Relay / Connection
Humidification Relay / Connection (for dry contacts)
Return Air Sensor (RAS) Required
W/E
W2
Y
Y2
G
O/B
L
HM
HM2
DHM
SYS
DRY
SYS
DHM2
RC RH
R
C
*HVAC Transformer
24 VAC
HOT
NEUTRAL
120 VAC
DRY
Connect Push
Button Switch
LED Push
Button Switch
R and C
from HVAC
Terminal Strip
or System
Transformer
Status LED
EQUIPMENT CONTROL WIRING TO HVAC EQUIPMENT