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Safety Circuit
1
Sp a S e t
C l o c k
/
Fi r e m a n
1. Fireman's Switch (Time Clock) wired to CLK (red) loop on 14 pin connector, P2, is
open. Connection is used in order to turn heater OFF 10-20 minutes prior to turning
Pump OFF. Cool-down cycle.
2. Vent Switch (Sail Switch, Air Pressure Switch) wired to VNT (orange) loop on 14 pin
connector, P2, is open Indicates Draft Inducer/Power Vent is Off or reduced Vent
Pressure.
3. Flow Switch (ASME Code Kit) wired to SPR (WHITE) loop on 14 pin Connector, P2, is
open Indicates Pump OFF or restricted flow to heater.
28
2
104F
Sp a S e t
Sw
V e n t
/
F i e l d
3
104F
Sp a S e t
Sw
#1
F l o w
/
F i e l d
104F
Sw
#2
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