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Finned copper tube gas boilers & water heaters – Boiler Manual
31
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NATURA
L GAS: Optimum results are obtained when the boiler/
water heater is operated with the manifold pressure(s) set per Table
19. Th e 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.
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 diff erential 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 fi ne tune the air sett ings 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 RA
TE 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 draft y 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 sett ing may be necessary if the unit
cycles frequently. If the room temperature over-shoots the thermostat
sett ing, reduce the anticipator sett ing.
Operating Control
Th e preferred control sett ing for potable hot water is
130°F
,
54°C
.
Th e operating control should be set to the lowest sett ing that will
satisfy the consumer's needs.
Sett ing the thermostat or operation control too high
can result in scalding resulting in severe personal injury!
High Limit (Aquastat)
Th e high limit is located in the left side area of the boiler/water
heater. A remote capillary bulb is run to a well on the outlet side
of the supply header. Th e high limit can be reset by depressing the
black rubber plug in the front top jacket panel.
Th e water heater high limit should be set a minimum of
20°F
,
11°C
higher than the operating control. Refer to the HOT WATER
SUPPLY section for the proper supply water temperature.
Flow Switch
A fl ow switch is provided in the water outlet piping to prevent the
boiler/water heater from fi ring without adequate water fl ow through
the heat exchanger.
Low Water Cutoff
If the boiler is to be installed above radiation or if required by other
codes or regulations, install a low water cutoff in appropriate piping.
Wire the switch and any external controls in series to the "Interlock"
contacts in the junction box (see the att ached Connection Diagrams
for details). Ensure that the low water cutoff device(s) will function
properly.
Flame Sense Module
Th e fl ame sense module is located on the control tray. It is an
intermitt ent pilot control device that controls the pilot gas fl ow,
spark energy to ignite the pilot gas and the main valve(s) once pilot
ignition has been proven.
Two fl ame failure alarm terminals are provided on the fl ame sense
module. For CSD-1, these terminals will be utilized to shut the unit
down in case of fl ame failure. Th e two terminals will be connected
to a lockout control module located on the control tray under the
fl ame sense module. Th is lockout control module contains a magnetic
latch relay that requires manual reset when de-energized. To reset
aft er fl ame failure, push and release the momentary contact switch
located within the front control panel.
