Install Instructions

page 42 and repair if necessary. Place the
appliance back into service.
Check Combustion Levels
Refer to page 44 of this manual for measuring
combustion levels and burner adjustments.
Clean Boiler Heat Exchanger
1. Shut down the appliance:
- Follow the instructions on Page 45 "To
Turn Off Gas to Appliance"
- Do not drain the appliance unless it will
be subject to freezing conditions.
- Do not drain the appliance if freeze
protection fluid is used in the system.
2. Allow the appliance to cool down to room
temperature before servicing.
3. Disconnect the gas piping and electrical
connector to the gas valve.
4. Disconnect the wiring harness connectors
from the blower.
5. Remove the mounting bolts and washers
securing the front of the heat exchanger
and set aside.
6. Carefully remove the front plate of the heat
exchanger. Ensure combustion chamber
insulation is not damaged during removal.
See WARNING on page 68.
7. Use a vacuum cleaner, compressed air or
water to remove any accumulation from
the heat exchanger flue ways. Do not use
any solvent.
8. Re-assemble the front plate of the heat
exchanger onto the heat exchanger. Ensure
the gasket and combustion chamber insula-
tion is in place and not damaged, replace
gasket and insulation if necessary. See
WARNING on page 68.
9. Re-assemble the blower the wiring harness.
10. Reconnect the gas piping and electrical
connector to gas valve. Check for leaks,
repair if necessary.
11. Close isolation valves at the appliance boil-
er piping to isolate the appliance from the
heating system.
12. Attach a hose to the boiler drain valve and
flush the boiler thoroughly with fresh
water by using the purge valves to allow
water to enter through the make-up water
line to the boiler.
13. Once the boiler has been completely
flushed, return the boiler and system pip-
ing back to operation.
14. Perform the required startup and checkout
procedures as outlined on pages 40 to 58.
Clean Domestic Heat Exchanger
1. Shut down the appliance:
- Follow the instruction on Page 45 “To
Turn Off Gas to Appliance”
2. Shut off all electrical power feed to the
appliance.
3. Allow the appliance to cool down to room
temperature before servicing.
4. Close the field installed isolation (shut off)
valves on both the domestic cold and hot
water lines to the appliance as shown in
figure 11 & 12 on pages 26 & 27.
5. Submerge one end of hose halfway into
cleaning fluid in a clean bucket with 4 gallons
of new undiluted, food grade, white vinegar.
6. Attach other end of hose to a potable
(bronze or stainless steel) circulating pump
with a 2.5 gallon per minute [9.5 liters per
minute] flow rate with 32 feet [9.7 meters]
of head equivalent to Grundfos UP 26-
99BF or Taco 009-SF5, use another hose to
connect from the pump to the field
installed domestic hot water outlet
drain/flush valve.
7. Attach separate hose to the field installed
domestic cold water inlet drain/flush valve.
8. Submerge the other end of this hose
halfway in fluid in the same bucket.
9. Open both drain/flush valves on the
domestic cold and hot water lines.
Maintenance Procedures
67