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I
TO Hum_dilier
Leads
I
To Hum_d_fie r Leads
I
To HUMTerminal
On
I
I
Furnace
Conirol
Board
Fig. 34 - Field-supplied
Isolation Relay for Humidifiers
with Internal Power Supply
Al1157
....
FIELD 24-V WIRING
....
FIELD 220-, 208/230-, 460-V WIRING
--
FACTORY 24-V WIRING
FACTORY 220-V WIRING
BLOWER DOOR SWITCH
c®
i o
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_--G,ol I '"G'°l
T@_
220-V FIELD-
AUXILIARY
O
SUPPLIED
J-BOX
L (_
DISCONNECT
(_
24-V
TERMINAL
BLOCK
NOTE 2
THREE-WIRE----
_
I
I
HEATING-ONLY
_
Nt _
Ii
I
I
I
-]
I
I
I
I
I
I
I
I
I
I
L
I
NOTE 1
FURNACE
I
i
I
i
'I
THERMOSTAT
TERMINALS
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ii:_:_iiiiiii',',iiiii/iiiiiii_ii_
i_iii!iiiiiiiiiiiiiii!iiiiii/i!iiiiiiiiii_i)
FIELD-SUPPLIED
DISCONNECT
208/230-OR
460-V
THREE
PHASE
.....
SIN
WIRE
208/230-V
SINGLE
PHASE
NOTES:I.
2.
3.
Connect Y-terminal in furnace as shown for proper blower operation.
Some thermostats
require a "C" terminal connection as shown.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
A12559
Fig. 35 - Typical
Single-Stage
Wiring
Diagram
34
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