Camus Hydronics DRH300, Installation, Operation And Service Manual

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10.6 CHANGING THE HOT SURFACE IGNITER
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The hot surface igniter is to be checked at least after
every 4000 hours of operation and more frequently
under high cycling conditions. This will maintain peak
ignition efficiency.
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Turn off main electrical power to the appliance.
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Turn off main manual gas shutoff to the appliance.
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Locate the hot surface igniter.
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Disconnect the two power leads to the hot surface
igniter.
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Loosen and remove the two screws that hold the
igniter.
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Lift the igniter vertically out of the burner mounting
flange. Use care, do not hit or break the silicon carbide
igniter. DO NOT pull out by leads.
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Ensure that the ceramic paper gaskets used to seal the
base and top of the igniter are reinstalled on the new
igniter.
10.6.1 RE-INSTALLING THE IGNITER
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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.
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Ensure that the igniter ceramic paper gaskets are
properly installed and seal the point of contact between
the igniter and fan mounting flange.
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Reconnect the power leads to the igniter.
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Turn on main gas supply.
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Turn on main power.
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Test fire the appliance to ensure proper operation.
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The igniter must generate a minimum of 3A to reliably
light the main burner (models 300-2500) and pilot
(models 3000 – 5000).
10.7 HEAT EXCHANGER INSPECTION
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The heat exchanger should be inspected at the time of
burner maintenance.
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Turn off all power to the appliance.
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Turn off main gas to the appliance.
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Remove top cover.
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Remove fan assembly and burner as detailed in the
Burner and Cleaning section.
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Check the heat exchanger surface for soot. If soot is
present, heat exchanger must be cleaned
•
Remove the front outer jacket door.
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Remove the top wrap to expose the baffles.
•
Remove baffles from the exchanger.
•
Use detergent water pressure wash to remove soot
from heat exchanger and surfaces of the inner wrap.
•
When necessary, the heat exchanger can be removed
by disconnecting all water piping and removing the six
flange mounting bolts at the rear of the appliance. The
heat exchanger can now be removed from the front of
the appliance.
•
Reinstall baffles, stainless steel bands and stainless
steel wrap. Replace any damaged gaskets to ensure a
proper air seal. Replace any ceramic facing tape
damaged on the baffles.
•
Reinstall the burner and fan assembly.
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Reassemble all gas and water piping. Test for gas
leaks.
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Reassemble outer jacket panels. Keep top cover off.
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Cycle unit and check for proper operation.
•
Once proper operation is confirmed replace the top
cover.
10.8 RE-INSTALL HEAT EXCHANGER
•
Carefully reinstall the heat exchanger if removed from
the appliance
•
Check all silicon and viton gaskets and replace if
damaged
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Reassemble inner wrap
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Cycle unit and check for proper operation
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Replace the top cover
10.9 COMBUSTION AIR FAN
Combustion air fan should be checked every 6 months.
Clean the internal filter as required when installed in a dust
or dirt contaminated location. The motor and bearings on
the combustion air fan are sealed and permanently
lubricated requiring no addition of oil or lubricants.
10.10 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.
10.11 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. A
tripped circuit breaker indicates a short in the 24VAC
controls and must be corrected.
10.12 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.
10.13 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.
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Location - Heating boilers, hot water supply boilers or
water heaters must be located in a room having a
temperature of at least 50ºF (10ºC)