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Page 44
GB300 BOILER INSTALLATION AND OPERATION INSTRUCTIONS
1. Attach a 20" manometer to the tap on the manifold.
2. Remove the regulator adjustment screw cap from
the gas regulator. On systems that do not use a
separate gas regulator, remove the adjustment screw
cap from the gas valve body on the valve closest to the
gas supply piping.
3. Rotate the regulator adjustment screw clockwise to
increase the manifold pressure, counterclockwise to
decrease it.
4. Replace the regulator adjustment screw cap and
pressure tap plug.
CAUTION: Never force the regulator adjustment
screw beyond the stop limits or damage to the
regulator will occur!
PROPANE GAS: A manifold pressure of 10" WC must
be maintained for proper operation of the boiler. If the
manifold pressure is off by more than 5% adjust it
according to steps 1 through 4 above.
Input Rate
Gas appliances are rated based on sea level operation
with no adjustment required at elevations up to 2000 feet.
At elevations above 2000 feet, input ratings should be
reduced by 4% for each 1000 feet above sea level.
Check the input rate as follows:
1. Turn off all other gas appliances that use the same
gas meter as the boiler.
2. Call your gas supplier and ask for the heating value
of the gas.
3. Start the boiler and let it run for 15 minutes.
4. Using the gas meter and a stop watch, clock the
time that it takes to burn 10 cubic foot of gas and divide
this time by 10.
5. Insert the heating value and the time, in seconds,
into the formula below.
Input = (heating value, Btu/hr)(3600)/(time, seconds)
If the computed rate deviates by more than 5% from the
rated input value of the unit adjust the manifold pressure
accordingly.
NOTE: The Honeywell VR8404 valve is factory set and
can-not be field adjusted
DO NOT adjust the manifold pressure by more than 5%.
If a proper rate cannot be maintained without adjusting
the manifold pressure beyond the 5% limit, the main
burner orifices must be replaced. If the input rate is too
low, go to the next lager size main burner orifices. If the
input rate is too high, go to the next smaller size.
CAUTION: Never increase the input to the boiler
above that for which it is rated. Doing so can cause
premature failure of the boiler!
Low Water Cutoff
Ensure that the low water cutoff device(s) function
properly. Test in accordance with the manufacturer's
instructions included with the device(s).
Thermostat Adjustment
For a thermostat that employs an adjustable heat
anticipator, adjust the anticipator to match the current
measured in the thermostat circuit. An increased
anticipator setting may be necessary if the unit cycles
frequently. If the room temperature over-shoots the
thermostat setting, reduce the anticipator setting.
BOILER MAINTENANCE
CAUTION: Servicing, inspection and adjustment
must be done by a trained technician in accordance
with all applicable local and national codes. Improper
servicing or adjustment can damage the boiler!
The boiler should be cleaned and inspected once a year,
before each heating season. Make sure that the
burners and ignition components are free from dust,
soot, dirt, corrosion or other deposits that would impair
the boiler's performance.
Burner Removal
1. Close the manual shutoff valves in the gas supply
lines and turn off electrical power to the boiler.
2. Remove the front grill(s).
3. Lift the rear of the burner up and slide it towards
the back of the boiler. When the orifice bracket is clear
of the orifice lower the burner and remove it by sliding
it forward and out from the boiler.
4. Inspect each burner for damage or signs of
deterioration. Use a brush or compressed air to remove
any debris from the burner ports.
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