UTICA BOILERS MAGB, Руководство по установке и эксплуатации

Страница: 22 / 32

CHECKING GAS INPUT RATE TO BOILER
The check should be performed by a qualified technician
Gas input to the boiler can be adjusted by removing the protective cap on the pressure
regulator, (See figures 8 and 9 on pages 16 and 17), and turning the screw clockwise
to increase input and counterclockwise to decrease input. Natural gas
manifold pressure should be set at approximately 3.5 inches water column. Propane gas
manifold pressure should be set at approximately 11.0 inches water column. These
manifold pressures are taken at the outlet side of the gas valve. See figures 8 and 9 on
pages 16 and 17.
To check for proper flow of natural gas to the boiler, divide the input rate shown on the
rating plate by the heating value of the gas obtained from the local gas company. This will
determine the number of cubic feet of gas required per hour. With all other gas appliances
off, determine the flow of gas through the meter for two minutes and multiply by 30 to get
the hourly rate. Make minor adjustments to the gas input as described above. If the proper
rate cannot be obtained, contact the manufacturer.
CHECK SAFETY CONTROL CIRCUIT , after burner adjustments are made, for
satisfactory operation.
1. Pilot: With main burner operating, turn the pilot gas adjusting screw clockwise
until pilot gas is turned off. See figures 8 and 9 on pages 16 and 17. Within 90
seconds the main gas control should close, shutting off the gas to the main burner.
2. High limit control (figure 15 above). Remove cover and note temperature setting.
Decrease this setting to the minimum and operate boiler. When the boiler water temperature
exceeds the control temperature setting, the control will open the circuit, closing the
automatic main gas valve.
PAGE 21
FIGURE 14
FIGURE 15