Checking And Adjusting - Dunkirk PVWB Installation Instructions Manual

FIG. 14 - LIGHTING PILOT
FIG. 16 -VR8204A/VR8304M AUTOMATIC
GAS VALVE
ADJUST PILOT BURNER
Pilot flame should surround 3/8" to 1/2" of the pilot sensor.
Refer to Fig. 18. If flame needs adjusting, do it as follows:
1. Remove screw cover over pilot adjusting screw.
2. Insert small screwdriver and adjust flame as needed. Turn screw
counterclockwise to increase flame, clock-wise to decrease.
3. Replace screw cover over pilot adjusting screw.
MAIN BURNER(S)
The main burners do not require primary air adjustment and
are not equipped with primary air shutters. Main burner flames
should form sharp blue inner cones in a softer blue outer mantel,
with no yellow. Puffs of air from blowing on the flame or
stamping on the floor will cause the flames to turn orange
momentarily. This is not unusual. Remain still when observing
the main burner flames. If the flame appearance is not correct,
check main burner orifices and the burner throat and flame
ports for dust and lint obstruction. It may be necessary to
remove the rollout shield to observe the main burner flames.
Replace rollout shield after observation. Refer to Figure 17.
ADJUST LIMIT CONTROLS
Instructions for each control are included with the controls.
These settings can be changed after you have had some
RECOMMENDED BOILER WATER TEMPERATURES
Type of Heating Unit
Standing Radiators...................................180º F.
Baseboard and Convector Radiators........200º F.

Checking and Adjusting

Limit Control Setting
FIG. 15 -VR8200A/VR8300A AUTOMATIC
FIG. 17
idea how the system works. Example: If your system does not
give quite enough heat in very cold weather, you can raise the
limit setting to 220° F Use the boiler gauge to check your
settings. Make the adjustments according to its readings. Check
thermostat operation. When set above temperature indicated
on the thermometer, boiler should ignite. Make certain the
thermostat turns off the boiler when room temperature reaches
the selected setting and starts the boiler operating when room
temperature falls a few degrees.
After setting limit control to limit setting, check to see if it shuts
off the gas supply to the burners. Turn your thermostat up to call
for heat and let your boiler run until the temperature of the water
reaches the limit setting. The gas valve should shut off and the
circulator keep running until the thermostat is satisfied, or the
water cools enough to restart the burners through the limit control.
Finally, set the thermostat for the desired temperature. Special
conditions in your home and the location of the thermostat will
govern this setting.
FIG. 18
18
GAS VALVE