GBT A2-035, Инструкция по установке и эксплуатации

Страница: 18 / 45

Page 17
9. Verify the water flow switch opens at the minimum water flow rate by slowly closing a manual ball valve
installed in the water outlet piping, until the difference between the water inlet and outlet reaches 95 –
100
o
F (53 – 55
o
C). Note: The operating thermostat may have to be turned to its highest setting in
order to conduct this test. If the main burner does not shut down when this temperature difference is
achieved, adjust the flow switch set point until the flow switch opens (refer to Operating Section for
instructions concerning setting the flow switch).
10. Fully open the manual ball valve in the water outlet piping.
11. After the main burner has been in operation for at least five (5) minutes, inspect the venting for spillage.
Draft tests must be done with the appliance firing. Proper draft or airflow in the venting may be
determined by either of the following means:
o
Smoke Test – Place a source of smoke or other visible fumes under the opening of the draft
hood. If the fumes are all drawn up the draft hood opening, the appliance is drafting properly. If
any fumes roll outside of the vent hood there is a problem with the drafting or make-up air.
o
Draft Gauge – A draft pressure gauge can be inserted into the vent pipe directly above the draft
hood. The draft gauge must show a constant negative pressure.
12. Turn the operating thermostat down to its lowest setting. The pilot and main burner will shut off. Close
the manual gas valve immediately upstream of the heater/boiler.
13. Remove the gas pressure manometers and replace all plugs. Use an appropriate pipe thread sealant
(do not use Teflon tape).
14. Open the manual gas valve immediately upstream of the heater/boiler and set the operating thermostat
at the desired temperature.
NOTE: Low inlet water temperatures on start-up may create flue gas condensation which may
gather on the floor under the heater. THIS IS NOT A LEAK. The unit will stop condensating when it
reaches standard operating temperatures.
SHUT DOWN PROCEDURE
1. Set the operating thermostat to lowest setting and turn the gas valve to “OFF.”
o
For A2-(H,B)-035/050 models, rotating the control knob on top of the combination regulating gas
valve to the “OFF” position turns off the gas.
o
For all other models, the gas is turned off by rotating the handle on the separate manual gas
valve to a position perpendicular to the gas piping.
2. Switch off all electrical power to the system.
Main Burner Flame Pilot Burner Flame