LAARS Mini-Therm JVi - Install and Operating Manual - Manual (Page 16)

Mini-Therm JVi Page 15
Figure 13. Main Burner/Pilot Flame Pattern.
2B. Sequence of Operation
1. Wall thermostat will call for heat.
2. Pump relay will turn on the circulating pump.
3. If water temperature is below the limit setting,
the inducer motor relay will turn on the draft
inducer.
4. Pressure switch will sense the fan (inducer)
operation and send 24 volts to the flame rollout
switch.
5. In normal conditions, the flame rollout switch
will be in a closed position. 24 volts will be sent
to the gas valve/controller, the igniter will glow
and the pilot valve will open, lighting the pilot.
6. After pilot is proven to be lit, the main gas valve
will open, the main burners will ignite and
continue until either the hi-limit or wall
thermostat opens.
7. When the wall thermostat is satisfied, the
burners will shut off. The relays will turn off the
circulating pump and the draft inducer. When the
room temperature falls below the wall thermostat
setting, the cycle will repeat.
0.50
(13)
JVH PILOT JVP PILOT
1.25
(32)
0.16
(4)
0.50
(13)
0.10 TO 0.35
(3 to 9)
1.25
(32) MAIN BURNER
FLAME PATTERN
MINIMUM FLAME
LENGTH
MINIMUM FLAME
LENGTH
Dimensions in
inches (mm).
Figure 12. JVH Schematic.