DOMINATOR INSTALLATION AND OPERATION INSTRUCTIONS
Page 31
4. Use a 3/32 hex wrench to turn the pressure
regulator adjustment screw clockwise to increase
the pilot pressure and counterclockwise to decrease
it.
5. Replace the pressure regulator adjustment screw
cap.
Gas Pressure Adjustment
CAUTION: The maximum inlet gas pressure listed on
the rating plate must not be exceeded or damage
to the boiler/water heater may occur voiding the
warranty!
The minimum supply pressure listed on the rating plate
is for input adjustment.
NATURAL GAS: Optimum results are obtained when the
boiler/water heater is operated with the manifold
pressure(s) set per Table 19. The manifold pressure
should not vary outside these ranges. Each gas valve
pressure regulator has been preset at the factory. If
adjustment is necessary the following steps must be
followed:
1. Remove the 1/8" plug(s) from the manifold pressure
valves. Connect
20 in
,
508 mm
W.C. manometers
to them, see Figure 18.
2. Remove the regulator adjustment screw cap from
the safety shut off valve(s).
3. Rotate the regulator adjustment screw clockwise to
increase the manifold pressure, counterclockwise to
decrease it.
4. Replace the regulator adjustment screw cap and
manual shut off valve pressure tap plug.
CAUTION: Never force the regulator adjustment
screw beyond the stop limits or damage to the
regulator will occur!
PROPANE GAS: Optimum results are obtained when
the boiler/water heater is operated with the manifold
pressure(s) set per Table 19. If the manifold pressure is
off by more than 5% adjust it according to steps 1
through 4 above.
Airfl ow Adjustment
1. Remove the upper front jacket panel.
2. Connect both sides of a manometer to the pressure
switch tee, Figure 18, going to one of the pressure
switches.
3. With the unit operating at high fi re the differential
pressure should be between
0.6 and 0.8 in
,
15 and
20 mm
W.C. Do not change air pressure in lower
stages.
4. To fine tune the air settings once the upper front
jacket panel is installed, remove the plastic plug(s)
on the upper front jacket panel. Use a Phillips
screwdriver to rotate the screw(s) to obtain the CO
2
and CO readings in the INPUT RATE section above.
CONTROL DESCRIPTION
Boiler Thermostat
If a thermostat is to be used to control the boiler always
follow the instructions included with the thermostat.
Proper location of the thermostat will ensure effi cient
trouble-free operation of the boiler. Mount the thermostat
to an inside wall at a height approximately fi ve feet
above the fl oor.
Avoid placing the thermostat in areas that will not
provide an accurate measurement of the room
temperature. Locating the thermostat behind a door, in
an alcove, close to a source of thermal radiation or in a
drafty area will cause poor or sporadic heating.
For a thermostat that employs an adjustable heat
anticipator, adjust the anticipator to match the current
measured in the thermostat circuit. An increased
anticipator setting may be necessary if the unit cycles
frequently. If the room temperature over-shoots the
thermostat setting, reduce the anticipator setting.
Operating Control
The preferred control setting for potable hot water is
130°F
,
54°C
. The operating control should be set to the
lowest setting that will satisfy the consumer's needs.
WARNING: Setting the thermostat or operation
control too high can result in scalding resulting
in severe personal injury!
