Starting the System, Checking the Gas Line

SECTION 13: STARTING THE SYSTEM

Start with the main gas valve closed and the electric power off.

13.1 Checking the Gas Line

1.Open the main valve and verify that no gas is flowing through the meter.

2.Purge the line if this was not done following pressure testing with air.

3.Verify that the gas pressure is not above 14'' w.c. (1/2 PSIG).

4.Close the main gas valve.

13.2Checking the Electrical System

1.See that all temperature setpoints are set below room temperature.

2.Turn on power supply to system controls.

3.Check to see that no part of the system (i.e. burners, pump or air supply blower) is powered.

4.Individually check each zone by raising the zone temperature set points separately. Raising each zone temperature set point above room temperature should start the pump immediately. After a 45 second delay, the burners will begin their ignition sequence by sparking at the electrode (visible through the burner window).

5.Make a preliminary vacuum check at burners in branches that have an adjustable damper coupling. See Page 50, Figure 35 for manome- ter hookup to check vacuum. This check is to insure that all dampers are open before the system is fired. Vacuum, as measured at the end vents, should be approximately 3.5'' w.c. or slightly above (cold).

13.3Starting the System

NOTE: During the initial firing, the protective oil on the tubing may smoke for 30 to 60 minutes and adequate ventilation should be provided.

1.Start with all temperature setpoints below room temperature.

2.Open main gas valve.

3.Turn up temperature setpoints one zone at a time, waiting to see that all burners in a zone start. When the burner ignites, a blue flame will be observed through the viewer window.

4.If any abnormal operation occurs, see the trou- bleshooting section of the service instructions.

13.4Setting the Vacuum

1.Set temperature setpoints above room tempera- ture. See that all burners are operating properly.

2.Allow at least ½ hour operation for temperature to normalize, then check system vacuum bal- ance. Vacuum can be measured by inserting a manometer hose into the end vent as shown on Page 50, Figure 35. Normal end vent vacuum should be set at approximately 2.5'' w.c. to 3.0'' w.c. (hot).

Vacuum adjustments are made by means of the damper in the pump inlet and the adjustable damper coupling(s) in the system. Check the vacuum at all end vents and then adjust the damper coupling to obtain equal vacuum readings of 2.5'' w.c. to 3.0'' w.c. If end vent vacuum exceeds 3.0" w.c., adjust the pump inlet damper until vacuum readings are 2.5'' w.c. to 3.0'' w.c.

With systems designed to operate at maximum vacuum, it may not be possible to obtain vacuum differential readings at or slightly above 2.5'' w.c. If so, adjust the damper couplings to maximum but equal vacuum reading. Be sure to lock all dampers securely after adjustment.

3.Reset temperature setpoints to desired room temperature.

4.If heat is not required, turn off main switch and close the main gas valve.

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