8
Servicing should only be performed by a Qualied Service Technician
INSTALLATION QUICK TIPS – BTH 300, 400, 500 GAS PRESSURE
ADJUSTMENT PROCEDURE: MANIFOLD GAS PRESSURE BTH 300, 400, 500
A minimum dynamic gas supply pressure of 5.2" w.c. (1.30 kPa) for Natural Gas and 11" w.c.
(2.74 kPa) for Propane (LP) Gas is required before making any adjustment to the gas control
pressure regulator. Attempts to adjust the regulator during periods of low gas supply pressure could result
in over firing of the water heater when the gas supply pressure returns to normal.
Check gas line pressure with a manometer, adjust the gas supply line pressure "Gas Pressure
Specifications" table on Page 4.
1. Check manifold pressure using a pressure gauge (manometer) connected to the manifold pressure
tap on the gas control valve. If manifold pressure adjustment is required, remove cover screw from
top of the gas control valve. Using a small screwdriver, turn adjusting screw clockwise to increase
gas pressure or counter clockwise to decrease gas pressure to obtain 4.0" w.c. (1.0 kPa) for Natural
Gas and 10" w.c. (2.49 kPa) for Propane (LP) gas.
2. Cycle the burner on and off several times to check for proper operation.
3. Check the high limit and operating controls for proper operation.
4. Check the vent system seams and joints and ensure that there is no leakage of flue products into
the room.
5. Verify correct input rate as shown on Page 6.
HIGH ALTITUDE ADJUSTMENT BTH 300, 400, 500
For high altitude adjustments, contact the help line number on the front of the water heater or contact
help@hotwater.com.
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