Hatco Powermite PMG-100 Manuel D'installation Et D'utilisation page 22

MAINTENANCE
Transformer Replacement
1. Shut off electrical power to the heater.
2. Remove screws from electrical box and lift off.
3. Disconnect wire leads from transformer at the power
supply.
4. Remove mounting screws that hold transformer in place.
5. Remove transformer from unit and replace with new one.
6. Reverse above procedure to re-install.
Temperature Control Probe Replacement.
1. Shut off electrical power to the heater.
2. Shut off water supply to the heater and open drain valve to
remove water below the temperature control probe level.
3. Remove the front panel cover.
4. Disconnect temperature control probe wire leads from
thermostat body.
5. Remove temperature control probe from tank.
6. Reverse above procedure to re-install.
Recirculating Pump Replacement
1. Shut off gas supply.
3. Shut off electrical supply.
3. Shut off water supply and allow unit to cool sufficiently.
4. Open the drain valve under the Booster Water Heater to
remove water from the tank and pump assembly.
5. Remove front cover and left side panel for access to pump.
6. Remove two screws from the electrical box cover and lift
off.
7. Remove pump motor cover and disconnect wiring
connections to the pump motor.
8. Remove bolts and nuts holding pump assembly to flanges
(save bolts and nuts).
9. Install new pump assembly using new O-rings (supplied
with pump assembly) starting with lower bolts first (flow
arrow must point upward).
10. Close the drain valve under the Booster Water Heater and
turn the water supply on checking for leaks at all fittings.
11. Connect wiring to new pump motor and install wiring
compartment cover.
12. Purge the air from the system. Turn on the electrical supply
and allow pump to displace air out of the heat exchanger
and holding tank by running several rinse cycles on the
dishmachine. Test all connections for tightness.
13. Turn on gas supply (check all fittings for leaks) and follow
start-up procedures.
Temperature/Pressure Gauge Replacement
1. Shut off electrical power to the heater.
2. Shut off water supply and open drain valve to remove water
in the piping.
3. Remove temperature/pressure gauge from pipe fitting
connection.
4. Reverse above procedure to re-install.
Temperature/Pressure Relief Valve Replacement
1. Shut off electrical power to the heater.
2. Shut off water supply and open drain valve to remove water
in the tank below the relief valve level.
3. Disconnect drain pipe from valve.
4. Remove temperature/pressure relief valve.
5. Reverse above procedure to re-install.
Low Water Cut Off Replacement
1. Shut off electrical power to the heater.
2. Remove screws for electronics cover and lift off.
3. Mark wires and disconnect from old module.
4. Reverse above procedure to re-install.
Tank High Limit Replacement
1. Shut off electrical power to the heater.
2. Shut off water supply and open drain valve to remove water
in the piping and pump.
3. Remove limit from mounting panel, disconnecting leads.
4. Loosen 3/8" (9.5 mm) tank fitting packing nut then remove
fitting.
5. Reverse above procedure to re-install.
Orifice Replacement (for High Altitude Orifice Size
Change or Orifice Repair)
1. Shut off electrical power and gas supply to the heater.
2. Remove front panel.
3. Remove flexible gas line connector from gas regulator
valve inlet.
4. Remove burner tray assembly as outlined above.
5. Loosen two nuts on each burner bracket and lift burners out
of the tray.
6. Unscrew brass orifices from the black distribution manifold.
7. Install new orifices as required.
NOTE: If this is a high altitude change, refer to the tables
in "High Altitude Installation and Operation" in the
INSTALLATION section for the appropriate diameter to
drill the orifice blanks for your elevation.
8. Reverse the procedure above to re-install, checking
burners and seals to prevent gas leaks.
22
English
PMG100200M-0222