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Model MHX3C Humidistat Installation Manual
Wiring Diagrams
DIAGRAM 2: Wiring High Limit Humidistat With
Elite Steam Humidifiers
DIAGRAM 3: Wiring 120V 1137/1000 Power Humidifiers
With Furnace Supplied 120V
DIAGRAM 4: Dehumidifier
DIAGRAM 1: Wiring 24V Bypass Humidifier
(Models 570, 900, 1042LH, 1099LHS, SL16)
N2
GND
N1
AB
AB
GND
IN
NO
C
NC
C
NO
GND
24V
MHX3
Humidistat
High Limit
Humidistat
Use Terminals 2 and 3 On Humidistat
Steam Humidier Control Module
MHX3C
Humidistat
727-58
24V Transformer
(Omit if Power Supply is
20-30 VAC)
Humidier 24V
Solenoid Valve
Or 24V Drum Motor
(Model 81)
120V Power Supply
Switched With Furnace Operation
Use Terminals 2 and 3 On
Humidistat
L1 N
G
Humidier Control Leads
(Yellow Wires)
Humidier
Power Cord
Humidier 24V Aux Power
(Red Wires)
120V Switched With Furnace Heating Cycle
DIAGRAM 5: Wiring 120V 1137/1000 Power Humidifiers
With Constant 120V Supply
Humidier Control Leads
(Yellow Wires)
Humidier
Power Cord
Humidier 24V Aux Power
(Red Wires)
L1
N
G
727-58
24V Transformer
(Omit if Power Supply
is 20-30 VAC)
120V Switched With
Furnace Heating Cycle
120V Constant Voltage
(Not Used, Attach Wire
Nuts to Each Lead) Do
Not Touch Together!
DHD3 Dehumidistat Dial
GFI #7061
CRD3 Humidistat Dial
GFI #7058
Optional Accessories
NC
C
NO
NC
C
NO
NC
C
NO
Dehumidier
MHX3C
Humidistat
Use Terminals 2 and 1 For
Dehumidistat
DH
G2
S1
S2
G1
C
W
Y
D
NC
C
NO
NC
C
NO
G
!
WARNING: ALL WIRING SHOULD COMPLY WITH LOCAL ELECTRICAL CODES.
(Not Used, Attach Wire
Nuts to Each Lead) Do
Not Touch Together!
Relay
MHX3C
Humidistat
MHX3C
Humidistat
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