LAARS Mini-Therm JVS (Sizes 50-225) - Install and Operating Manual - Manual (Page 26)

LAARS Heating Systems Page 26
SECTION 8.
Operating Procedures
Before placing the boiler in operation, check and
reset the safety shutoff devices. Once the boiler is
connected to the gas and water piping and after all the
requirements in previous pages have been met, follow
these procedures:
8A. System Start-up
1. Verify that the pump system is operating
properly:
a. Shut off the manual gas valve located
outside the boiler.
b. Raise the wall thermostat high enough to
call for heat.
c. The pump should come on immediately. If
it does not, test the electrical circuits.
2. Pilot and Main Burner Lighting:
a. The JV boiler does not require manual
lighting. The pilot is controlled by the
automatic ignition system.
b. Different models of the JV boiler utilize
various gas valves. Although the gas valves
may have different control knobs, they are
all similar in operation.
c. Understand and follow the operating
instructions that are applicable to the type
of ignition system installed on the boiler.
3. The pilot and main burners will automatically
ignite when there is a call for heat.
8B. 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 (JVH).
4. Pressure switch will sense the fan (JVH only)
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/spark 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 primary control, hi-limit
or wall thermostat opens.
7. When the wall thermostat is satisfied, the burners
will shut off. The relays will turn off the draft
inducer (JVH only) and the circulating pump.
When the room temperature falls below the wall
thermostat setting, the cycle will repeat.