Hatco Powermite PMG-100 Installation And Operating Manual page 26

MAINTENANCE
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 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 (2) 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 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
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 (2) 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.
Vent Outlet Adjustment to Right Side
1. Shut off electrical power to the heater.
2. Remove front panel.
3. Remove both side panels by removing two screws on each
panel from inside the cabinet. (Save these screws.)
4. Remove five (5) screws holding the top of the back panel
and two (2) nuts form below the front supports. (Save
fasteners.)
5. Clear wires from raceway clips and lift the top off the heater.
6. Remove three (3) screws holding the straight 90° elbow
duct to the exhaust blower and pull duct out.
7. Remove three (3) screws holding the straight duct to the
90° elbow duct and separate. (Save the screws.)
8. Attach the straight duct to the discharge of the exhaust
blower using the three (3) screws from Step g. Retain the
90° elbow duct for future relocation or discard.
9. Reassemble top and side panels in reverse order from
above.
10. Remove vent hole cover from right side panel and place on
back panel before reinstalling side duct letting exhaust duct
protrude.
26
power and gas supply
Form No. PMG100200M-0918
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