SECTION D: Start up
Safety Inspection
1.Check all thermostats and high limit settings.
2.During the following safety checks leave manome- ters hooked up, check and record.
3.If other
4.Check thermostats for
5.Check high limits for
6.While in operation, check flow switch operation
7.Check the low gas pressure switch (if provided). (For proper adjustment, use the attached manome- ters, if available, to set pressure. The scales on the switch are approximate only.) Low gas pressure switch (if provided) must be set at 3.0 in. WC for natural gas and propane gas.
8.Make sure that the high gas pressure switch (op- tional) is set to 3.0 in. WC for both natural gas and propane gas.
Follow-Up
Safety checks must be recorded as performed.
Turn heater on. After main burner ignition:
1.Check manometer for proper readings.
2.Cycle heater several times and
3.Remove all manometers and replace caps and screws.
4.Check for gas leaks one more time.
Leak Test Procedure: Dual-Seat Gas Valve
Proper leak testing requires three pressure test points in the gas train.
Remove the access panel on the rear of the heater to access the gas valve for this test. Test point A is a
bleedle valve located upstream of the combination gas valve on the supply manifold.
Test point B is a bleedle valve located between the two automatic gas valve seats.
Test point C is a bleedle valve located downstream of both automatic gas valve seats and upstream of the manual valve. Refer to Fig. 40.
These tests are to be conducted with the electrical power to the heater turned OFF.
1.Manually close the downstream leak test valve.
2.Open the bleedle valve at test point A and connect a manometer to it. Verify that there is gas pressure and that it is within the proper range (NOTE: must not exceed 14.0 in. WC).
3.Open test point B and connect a rubber tube to it. Connect the other end of the tube to a manometer and look for a
4.Next, close the upstream manual gas valve (field supplied) and remove the manometers from the bleedle valves in test point A and test point B. Connect a rubber tube from the test point A bleedle valve to the test point B bleedle valve and open the upstream manual gas valve. Make sure that test point A & B bleedle valves have been opened so as to allow gas to flow. This will bring gas pressure to the second valve seat.
5.Open the bleedle valve at test point C and connect a second rubber tube to it. Connect the other end of the tube to a manometer and look for a
6.Remove rubber tube and manometers. Close each test point bleedle valve as the tubes are removed.
7.After no leakage has been verified at all valve seats and test valves, open downstream leak test valve and restore electrical power to the heater.
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