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ADJUSTMENTS
SETTING THE BOILER CONTROL PRESSURE SWITCHES:
PRESSURE CONTROL SWITCH ADJUSTMENT:
If boiler fails to maintain steam pressure in operating range, pressure control switch may require adjustment.
Start boiler and allow pressure to build up to operating level - 7 PSI (1kg/cm²).
Check boiler pressure gauge. If gauge indicates 5 to 7 PSI, pressure control switches are properly ad-
justed.
If boiler does not come on when pressure gauge reads 7 PSI and does not go off when pressure gauge
reads 7 PSI, proceed as follows:
WARNING: Because power must be on to adjust pressure switches, be sure to protect against electrical shock.
Remove screw and lift front cover off control box.
Hand adjust operating pressure control switch and high limit pressure control switch by turning adjusting
nut (Knurled knob) clockwise to raise and counter clockwise to lower actuation point. Switch should be
set so that boiler comes on when boiler pressure gauge reads 5 PSI and goes off when gauge reads 7
PSI. Switch should be set so that boiler will shut off if pressure reaches 15 PSI.
The actuation value (differential) is factory set and cannot be changed.
The cold water condensor thermostat is preset at factory.
Repeat steps, 1, 2, and 3. If 45 to 7 PSI boiler pressure gauge reading is obtained during boiler opera-
tion, adjustment is correct. If proper adjustment cannot be made consult Trouble-Shooting Guide in this
manual.
After making adjustments, replace cover on pressure switch box and screw.
1.
2.
3.
a)
b)
c)
d)
e)
f)