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Part number 550-100-325/0419
51
AquaBalance
®
Series 2 Wall Mount Gas-fired Water Boiler – Boiler Manual
21 Gas piping (continued)
1. See page 14 for gas line sizing information.
1. See Figure 64 for location of the gas inlet pressure test port.
1. Set up the boiler to operate at maximum rate as described in
section “ Test mode” Figure 104, page 79.
2. With the boiler operating at maximum rate check that the op-
erational (working) gas pressure at the inlet gas pressure test
port (see above) complies with the requirements of Table 2 .
3. Ensure that this inlet pressure can be obtained with all other
gas appliances in the property working.
Measure the gas rate
Measure the gas rate and check against following Table 2:
For natural gas or liquefied petroleum (propane) gas, the pres-
sure required at gas valve inlet pressure port (verify minimum
gas pressure when all gas appliances are in operation):
a. Maximum: 13” w.c. with no flow (lockup) or with boiler
on.
b. Minimum: 3.5” w.c. gas pressure, with gas flowing (verify
during boiler startup, while boiler is at high fire)
c. Nominal gas pressure: 11.0” w.c.
4. Install 100% lockup gas pressure regulator in supply
line if inlet pressure can exceed 13” w.c. at any time.
Adjust lockup regulator for 13” w.c. maximum.
Figure 64
Gas Rate
Combi
Boiler
model
Maximum rate Minimum rate
ft
3
/h ft
3
/h
AB-80
AB-120
AB-155
Table 2
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