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SIT 820 NOVA mV GAS CONTROL VALVE
The 820 Gas Control Valve is shown below in FIGURE 27.
1. The left knob controls the ON/PILOT/OFF functions.
2. The right knob controls the manifold pressure to the burners and is labeled HI/LO.
3. There is a PILOT ADJSUT screw that should only be adjusted by a certified technician.
4. The SIT 820 has an input pressure test port labeled IN.
5. The SIT 820 has an output pressure test port labeled OUT.
To use either of the pressure test ports to measure pressure requires test equipment and knowledge required
by a certified service technician. Improperly adjusting the pilot adjust or the manifold pressure can cause
damage to the SIT 820 control valve and should only be accomplished by a certified professional. For
lighting instructions refer to the section on first fire in this manual or on the units control panel.
ON
OFF
PILOT
H
I
L
O
PILOT
ADJ
IN
OUT
FIGURE 27: SIT 820 mV NOVA GAS VALVE
NOTE: TP stands for thermopile, TH for thermostat, and TP TH for thermopile and thermostat. See
FIGURE 28.
ON/OFF SWITCH
OPTIONAL (millivolt)
REMOTE RECEIVER
OPTIONAL (millivolt)
REMOTE SENDER
OPTIONAL (millivolt)
THERMOSTAT
THERMOSTAT
TERMINAL BLOCK
TP TH
PILOT BURNER
THERMOPILE
ON
OFF
PIEZOELECTRIC
IGNITER
SIT 820 mV CONTROL VALVE
IN
OUT
ON
PILOT
OFF
H
I
L
O
ADJ
PILOT
TP
TH
THERMOCOUPLE
IGNITER
1/16" to 1/8"
FIGURE 28: SIT 820 mV NOVA GAS VALVE WIRING DIAGRAM
Version 1.0h
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