Finned copper tube gas boilers & water heaters – Boiler Manual
33
OUTDOOR RESET WITH DHW OPERATION - A DHW
tank controlled by a pump provides reset override whenever
DHW generation is required. In Mode 5, reset override will occur
if the staging controller receives a signal across the “STPT DEM”
and “DEM SIG” terminals of the terminal strip. (i.e., closing a tank
aquastat switch wired to these terminals). In this case, the control
will temporarily override outdoor reset and increase the target
temperature to
180°F
,
82°C
to provide sufficient heat to satisfy
the DHW requirement.
Mode 6: Multiple BTC controls
. The control only operates
the pump and stage one.
REMOTE STAGING - An external staging control is used to control
and stage multiple boiler/water heaters. Factory supplied terminals
in the electrical box are used.
The operating control on the boiler/water heater is set to its low-
est setting when the water heater leaves the factory. The preferred
control setting for potable hot water is
130°F
,
54°C
. The operat-
ing control should be set to the lowest setting that will satisfy the
consumer's needs.
MAINTENANCE
Disconnect electrical power and close the manual gas
shut off valve before performing maintenance or severe
personal injury may result!
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury, exposure to hazardous materials or loss of life.
Installation and service must be performed by a
qualified installer, service agency or the gas supplier
who must read and follow the supplied instructions
before installing, servicing or removing this boiler.
This boiler contains crystalline silica materials that have
been identified as carcinogenic or possibly carcinogenic
to humans when inhaled.
AVERTTSSEMENT: une instqallation, un réglage,
une réparation ou un entretien non comforme aux
normes peut entraîner des dommages matériels, des
blessures,exposition à des matiéres dangereuses ou la
mort. L’installation et l’entretien doivent être effectués
par un installateur ou un service d’entretien qualifié ou
le foumisseur de gaz qui doivent avoir lu les
instructions foumies avant de faire l’installation,
l’entretien ou l’enlèvement de la chaudière et les
respecter, Cette chaudière contient des matériaux qui
ont été identifiés comme étant cancérogènes
ou l’être.
Servicing, inspection and adjustment must be done by
a trained technician in accordance with all applicable
local and national codes. Improper servicing or adjust-
ment can damage the boiler/water heater!
The ceramic combustion chamber contains crystalline
silica. Wear a tightly fitted dust mask when removing
the burners or heat exchanger to prevent inhalation
of airborne fibers. Crystalline silica fibers have been
identified as carcinogenic, or possibly carcinogenic
when inhaled.
The boiler/water heater should be cleaned and inspected once a
year, before each heating season. Make sure that the burner and
ignition components are free from dust, soot, dirt, corrosion or other
deposits that would impair the boiler/water heater’s performance.
Refer to page 38 for component identification.
Improper burner servicing can result in premature
burner failure voiding the warranty!
Burner Inspection And Removal - Figure 20
1. Close the manual shutoff valves in the gas supply lines and turn
off electrical power to the boiler/water heater.
2. Remove the jacket front panels.
3. Disconnect the manifold gas piping at the ground joint union(s).
Also disconnect the pressure sensing lines, pilot tubing and
ignition and sensing leads.
4. Remove the manifold(s).
5. Remove the burner(s) from the lower front combustion chamber
panel.
6. Inspect the burner(s) for damage or signs of deterioration. Use a
brush or compressed air to remove any debris from the burner
ports.
7. DO NOT install a damaged or badly corroded burner, replace
it.
8. Install the burner(s) making sure that the burner gasket is not
torn or deteriorated. If it is replace it.
9. Reassemble the unit following the removal steps in reverse order.
Heat Exchanger Inspection - Figure 20
1. Close the manual shutoff valves in the gas supply lines and turn
off electrical power to the boiler/water heater.
2. Remove the jacket front panels.
3. Disconnect gas piping at the ground joint union(s). Also
disconnect the pressure sensing lines, pilot tubing and ignition
and sensing leads.
4. Remove the upper partition panel, 1050 thru 2100 models.
5. Remove the 1/4 in nuts and washers holding the upper
combustion chamber front panel in place and carefully remove
it.
6. Inspect the inside and outside of the heat exchanger for signs of
damage, sooting or corrosion.
7. The outside surfaces of the copper tubes should be free of any
soot deposits. A slight black smudge is normal with some types
of gases. Black soot indicates poor combustion. Green deposits
indicate condensation due to low return water temperatures. In
either case the heat exchanger must be cleaned thoroughly and
the problem resolved before the boiler/water heater is returned
to service.
