Pressure Testing
SECTION 11
ADJUSTMENT
#BHM-38 & #BHM-38-BW
R.1 September 2021
70
HUSSONG MFG. CO., INC.
KOZY HEAT FIREPLACES
11.0 ADJUSTMENT
11.1 Pressure Testing
NOTE: The appliance and its appliance main gas valve must be
disconnected from the gas supply piping system during any pressure
testing of the system at test pressures in excess of 1/2 psi (3.5 kPa).
IMPORTANT: Pressure check taps for manifold (outgoing) and inlet
(incoming) pressure have been incorporated into the valve. The
pressure tap marked OUT measures outgoing pressure. The pressure
tap marked IN measures incoming pressure.
11.1.1 Inlet Pressure Test
NOTE: Make sure to apply these incoming pressure test with all other
gas appliances on, or at full capacity, in the house for proper pressure
reading.
IMPORTANT: If the inlet pressure reading is too high or too low, contact
the gas company. Only a qualified gas service technician should adjust
incoming gas pressure.
1. Loosen the inlet (IN) pressure tap by turning screw counter-
clockwise. See (A) in
FIGURE 11.1
.
2. Attach manometer using a 1/4” (6mm) I.D. hose.
3. Light pilot and burner. Check pressure to ensure it is between
the minimum and maximum recommended pressure settings
(
TABLE 11.1
).
4. Turn off burner and pilot.
5. Disconnect hose and tighten the inlet (IN) pressure tap by
turning screw clockwise. Screw should be snug. Do not over
tighten.
6. Relight pilot and burner. Then reattach manometer to the
inlet pressure tap (A) to verify the tap is completely sealed.
Manometer should read no pressure.
11.1.2 Manifold Pressure Test
1. Light pilot.
2. Loosen manifold (OUT) pressure tap by turning screw counter-
clockwise. See (B) in
FIGURE 11.1
.
3. Attach manometer to pressure tap using a 1/4” (6mm) I.D. hose.
4. Light burner. Check manometer reading. Refer to
TABLE 11.2
.
5. Turn burner and pilot off.
6. Disconnect manometer hose and tighten the manifold (OUT)
pressure tap by turning screw clockwise. Screw should be snug.
Do not over tighten.
7. Attach the manometer to the manifold pressure tap (B) to verify
it is completely sealed. The manometer should read no pressure
when pilot and burner are on.
Table 11.1, Inlet Pressures
Fuel
Natural Gas
Propane
Gas Supply
Min - Max
Min - Max
Inlet Pressure
Tap (A)
5” - 10.5” WC
(1.25 - 2.62 kPa)
12” - 13” WC
(2.99 - 3.24 kPa)
Table 11.2, Manifold Pressures
Fuel
Natural Gas
Propane
Gas Supply
Low - High
Low - High
Manifold Pressure
Tap (B)
1.1” - 3.8” WC
(0.27 - 0.95 kPa)
2.9” - 11” WC
(0.72 - 2.74 kPa)
Inlet pressure
tap
Manifold pressure
tap
A
B
FIGURE 11.1
Pressure Check Taps
