Connections
29
Gas Input
\
1. Close main gas shut-off valv e.
2. Disconnect main power supply to
boiler.
3. Remove plug
1
/
8
“ NPT on manifold.
Install test plug and connect U-tube
manometer or equivalent.
4. Place boiler/burner in operation.
5. Read manifold gas pressure and
compare with stamped rating on
rating plate. If necess ary, adjust
pressure on gas valve. Also clock
input using gas meter.
If using meter clocking method:
Ensure there is no gas flow through
the meter other than to the boiler
being checked. Other appliances
must remain off, including t heir pilot
burners.
6. Deactivate boiler, reinstall
1
/
8
“NPT
plug, place boiler in operation again.
7. Repeat gas leak test at plug
1
/
8
“NPT
and ensure tightness.
5167 450 v1.4
BURNER
Blue
Light blue
Inner flame
cone
Main flame cone
4” / 102 mm
¾” /
20 mm
Fig. 13
½” / 14 mm
5” / 124 mm
Q3451A igniter/sensor
pilot burner
Fig. 14a
Do not exceed input rating stamped
on rating plate of boiler.
CAUTION
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