LAARS Mini-Therm JVS (Sizes 50-225) - Users Manual - Manual (Page 2)

Page 2 LAARS Heating Systems
Important: When lighting or relighting, wait the
full 5 minutes specified in the lighting instructions.
Unburned gases can accumulate in the fire box and
may flash back. Allow ample time for natural air
movement to clear the gases from the chamber before
lighting or relighting.
Relighting - All Models:
1. Turn off electrical power to the boiler.
2. Turn the gas valve knob (clockwise for JVS) to
Off.
3. Wait five minutes.
4. Turn the gas valve knob (counterclockwise for
JVS) to On.
5. Restore power to the boiler, and set the
thermostat to the desired temperature. The
pilot will automatically ignite when there is
a call for heat.
Circulator Pump:
In normal operation, the pump is energized by the wall
thermostat via the pump relay supplied with the boiler.
Caution: Hazard of electrical shock!
Disconnect power to the boiler before
servicing the relay or transformer.
B. System Shut Down
Turn off all gas valves and the electrical
disconnect switch. Whenever danger of freezing exists,
shut off the water supply, remove the drain plugs in the
left side of the heater and open the drain valve on the
right side. Drain every part of the system which might
be subject to freezing temperatures.
Should overheating occur or the gas supply fail
to shut off, do not turn off or disconnect the electrical
supply to the pump. Instead, shut off the gas supply at
a location external to the appliance.
En cas de surchauffe ou si l'admission de gas
ne peut être coupée, ne pas couper ni débrancher
l'alimentation électrique de la pompe. Fermer plutôt le
robinet d'admission de gas à l'extérieur de l'appareil.
To Shut Down Boiler:
(JVS and JVH) Automatic Ignition Systems:
1. Turn off power to the boiler and set the
thermostat to the lowest setting.
2. Turn the gas valve knob (clockwise for JVS) or
switch to the Off position.
C. Maintenance
1. Lubricate the water circulating pump according
to the instructions found on the pump.
2. If a strainer is employed in a pressure reducing
valve or in the piping, clean it every six months.
3. At start-up and periodically thereafter, the flame
should be observed for proper performance. If
the flame has “sooting” tips, check for debris
near the orifices. If this continues, call a service
technician.
4. For JVS models, ensure proper operation of the
mechanical damper, mounted in the flue collar,
by observing the damper handle. Be sure the
handle swings when the draft inducer starts.
Depending on the boiler size, the swing may be
as little as 30°. Remove any obstructions and
clean around the pivot rod (handle) holes.
5. Inspect the venting system for obstructions,
leakage and corrosion at least once each year.
6. Keep the boiler area clear and free from
combustible material, gasoline and other
flammable vapors and liquids.
7. Be certain all combustion air and ventilation
openings are unobstructed.
8. Check for fouling on the external surfaces of the
heat exchanger every six months.
Fouling on the external surfaces of the heat
exchanger is caused by incomplete combustion
and is a sign of combustion air and/or venting
Figure 2 - Gas Control for JVH Models
ON
OFF
Gas Control Knob
Figure 1 - Gas Control for Automatic Ignition System (JVS)