Freestyle 2 Series Manual page 51

FreeStyle
®
2
series
21 Gas piping
Gas pipe sizing
1. See page 14 for gas line sizing information.
Check gas pressure at inlet to boiler
1. See Figure 64 for location of the gas inlet pressure test port.
Check the operational (working) gas inlet
pressure
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.
Table 2
Gas rate for Combi and Heating Only boilers
Gas Rate (Natural Gas)
After 10 minutes from cold
Maximum rate
Combi
Boiler
model
ft 3 /h
FS-80
78.4
FS-120
117.6
FS-155
151.9
Part number 550-142-950/0122
-
wall mount gas fired water boiler
(continued)
Minimum rate
ft 3 /h
7.8
11.8
15.2
–
boiler manual
Measure the gas rate
Measure the gas rate and check against following Table 2:
For natural gas or liquefied petroleum (propane) gas, the pressure
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 gas pressure, with gas flowing (verify during
boiler startup, while boiler is at high fire)
— FreeStyle® 80: 3.5" w.c.;
— FreeStyle® 120: 3.5" w.c.;
— FreeStyle® 155: 3.5" w.c.
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
Inlet test port on gas valve
Inlet test port
51