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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
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
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.
