Camus Hydronics DFH500, Installation, Operation And Service Manual

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10.6.1 RE-INSTALLING THE IGNITER
•
Confirm that the end of the replacement igniter has a
bead of silicone sealing the gap between the metal
mounting flange and the ceramic shaft of the igniter.
•
Carefully insert the igniter into the mounting point on
the burner flange and push into position on top of the
fan’s flange.
•
Reinstall the two mounting head screws and tighten by
hand only.
•
Ensure that the igniter ceramic paper gaskets are
properly installed and seal the point of contact between
the igniter and fan mounting flange.
•
Reconnect the power leads to the igniter.
•
Turn on main gas supply.
•
Turn on main power.
•
Test fire the appliance to ensure proper operation.
•
The igniter must generate 3A to reliably prove the
ignition system.
10.7 PRIMARY HEAT EXCHANGER
INSPECTION
•
The primary heat exchanger should be inspected at the
time of burner maintenance.
•
Turn off all power to the appliance.
•
Turn off main gas to the appliance.
•
Remove top cover.
•
Remove fan assembly and burner as detailed in the
Burner and Cleaning section.
•
Check the heat exchanger surface for soot. If soot is
present, heat exchanger must be cleaned and problem
corrected.
•
Remove the front outer jacket door.
•
Remove the front inner jacket door.
•
Check “V” baffles on the exchanger.
•
Use detergent water pressure wash to remove soot
from heat exchanger and surfaces of the inner
chamber.
•
When necessary, the heat exchanger can be removed
by disconnecting all water piping and removing the
eight flange mounting bolts at the rear of the appliance.
The heat exchanger can now be removed from the
front of the appliance.
•
Reinstall inner jacket door. Replace any damaged
gaskets to ensure a proper air seal.
•
Reinstall the burner and fan assembly.
•
Reassemble all gas and water piping. Test for gas
leaks.
•
Reassemble outer jacket panels. Keep top cover off.
•
Cycle unit and check for proper operation.
•
Once proper operation is confirmed replace the top
cover.
10.8 CONDENSING HEAT RECOVERY
MODULE (CHRM) INSPECTION
•
Inspect the CHRM annually.
•
Turn off all power to the appliance.
•
Turn off main gas to appliance.
•
Remove the top cover, front and right side outer
panels.
•
Remove the CHRM access cover.
•
Pressure wash the heat exchanger. Use a soft bristle
brush to remove any remaining deposits.
•
If necessary the heat exchanger can be removed by
disconnecting all water piping and lifting it out from the
side.
10.9 RE-INSTALL HEAT EXCHANGERS
•
Carefully reinstall the heat exchanger if removed from
the appliance.
•
Check all gaskets and replace if damaged.
•
Replace heat exchanger cover.
•
Reassemble outer jacket panels.
•
Cycle unit and check for proper operation.
•
Replace the top cover
10.10 COMBUSTION AIR FAN
Combustion air fan should be checked every 6 months.
Clean internal filter to fan as required when installed in a
dust or dirt contaminated location. See Combustion Air Fan
in the component section for cleaning procedure. The motor
and bearings on the combustion air fan are sealed and
permanently lubricated requiring no addition of oil or
lubricants.
10.11 COMBUSTION AND VENTILATION AIR
Check frequently to be sure that the flow of combustion and
ventilation air to the appliance is not obstructed.
Combustion and ventilation air must be provided to the
mechanical room with openings sized per the requirements
of the B149 or National Fuel Gas Code. The optional
outdoor air kit brings combustion air from the outdoors
directly to the appliance.
10.12 CONTROL CIRCUIT VOLTAGE
This appliance uses a transformer to supply a low voltage
control circuit. The voltage on the secondary side should be
24 to 28VAC when measured with a voltmeter. A secondary
voltage of 21VAC or less supplied to 24VAC components
may cause operational problems. A 4A circuit breaker is
provided on the secondary side of the transformer. The
circuit breaker is located on the front control panel. A
tripped circuit breaker indicates a short in the 24VAC
controls and must be corrected.
10.13 COMBUSTIBLE MATERIALS
CAUTION
Keep appliance clear from combustible materials; do not
store
GASOLINE
and other flammable vapors and liquids
in the proximity of the appliance.
10.14 FREEZE PROTECTION
Installations are not recommended in areas where the
danger of freezing exists. Proper freeze protection must be
provided for appliances installed outdoors, in unheated
mechanical rooms or where temperatures may drop to the
freezing point or lower. If freeze protection is not provided
for the system, a low ambient temperature alarm is
recommended for the mechanical room. Damage to the
appliance by freezing is non-warrantable.
•
Location
- Heating boilers, hot water supply boilers or
water heaters must be located in a room having a
temperature of at least 50ºF (10ºC)
•
Caution
- A mechanical room operating under a
negative pressure may experience a downdraft in the
flue of an appliance that is not firing. The cold outside
air may be pulled down the flue and freeze a heat
exchanger. This condition must be corrected to provide