49
MAINTENANCE
f. Clean tank and hose with water and inspect the
rear tank for sediment in the lower connection
port. The rear tank can be removed for cleaning
if required by removing the wing nut and
disconnecting the two float switch wire leads.
NOTE: Special care must be taken when
removing the hoses from the top of the rear tank.
They must be held secure and do not pull hoses
downward and away from their upper
connections to the heat exchanger and vent
adapter.
g. After cleaning, replace tanks and reconnect hoses
and wire leads to float switch. Fill the front tank
with water and check for any leaks at
connections.
h. Replace the front jacket panel, open the manual
gas valve and place the boiler service switch to
the on position.
2. Before re-starting the P
UREFIRE boiler follow the steps
below:
a. Reconnect the thermostat wires and unblock the
vent. (IMPORTANT: MAKE SURE
EXHAUST VENT IS NO LONGER
BLOCKED!)
b. Open the manual gas shutoff valve and reset the
thermostats.
c. Observe the boiler function to make sure you see
a condensate flow.
d. If you do not observe a condensate flow, repeat
the above procedure.
3. If the problem is not corrected at this point, it is
possible that there is a material deposit problem.
Follow the Coil Cleaning Instructions (Subsection 9E)
below to dissolve deposits and clean the heat
exchanger.
E. COMBUSTION CHAMBER COIL
CLEANING INSTRUCTIONS
Before beginning this procedure, you must have on
hand the following items:
– a nylon or brass brush (not steel)
– “Rydlyme” (recommended for best results)
(available online www.rydlyme.com) or “CLR”
(available at most hardware stores)
1. Shut the boiler down and access the heat exchanger
using the following steps:
a. Close the manual gas shutoff valve and wait for
the unit to be cool to the touch.
b. Disconnect the condensate piping from the outside
connections (not from the P
UREFIRE side) so the
flow can be observed.
c. Remove four screws on the 1/2" NPT connector
at the gas valve intake and disconnect the gas
valve electrical connector.
d. Remove the six 10 mm nuts from the burner
plate assembly. Disconnect wire leads to the
spark igniter and flame sensor. Disconnect two
Molex plugs from blower motor.
e. Pull the entire burner plate towards you to access
the heat exchanger coils.
2. Using a spray bottle filled with the recommended
product “Rydlyme” or “CLR”, spray liberally on the
coils, making sure the solution penetrates and funnels
down through the condensate hose. If the condensate
hose is blocked, let the chemical penetrate for at least
15 minutes or until it drains.
3. Use the nylon or brass brush (do not use steel) and
scrub coils to remove any buildup, then vacuum the
debris from the coils.
4. Spray coils with clear water, making sure to confine
the spray to the area being cleaned (try to avoid
wetting the back ceramic wall of the unit). Flush the
combustion chamber with fresh water. At this point,
the P
UREFIRE should be ready to power back up.
5. Reinstall the burner plate assembly using the
following steps:
a. Inspect the inside of the heat exchanger for dirt
and debris.
b. Install the burner plate assembly and replace the
six 10 mm nuts.
c. Reconnect the wire leads to the spark igniter,
flame sensor and gas valve. (Be sure that the
spark igniter is connected to the lead with the
large insulated connection boot.) Reconnect two
Molex plugs on blower motor.
d. Replace the four screws for the 1/2" NPT
connector on the gas valve. Turn the gas supply
on. (IMPORTANT: CHECK FOR GAS
LEAKS USING A SOAP SOLUTION.)
e. Reset thermostats. (IMPORTANT: BE SURE
THAT THE VENT CONNECTION IS NOT
BLOCKED.)
It is extremely important to make sure the exhaust
vent is not longer blocked. Failure to do so may
result in personal injury or death.
DANGER
It is extremely important that you check for leaks
when reconnecting the gas valve and make sure the
exhaust vent is no longer blocked. Failure to do so
may result in severe personal injury or death.
DANGER
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