Hatco Powermite PMG-100 Installation And Operating Manual page 27

Heat Exchanger Replacement
1. Shut off gas supply.
2. Shut off electrical supply.
3. Shut off water supply.
4. ALLOW UNIT TO
TEMPERATURE.
5. Open the drain valve under the booster heater to remove
water from the tank and pump assembly.
6. Disconnect water, gas, and relief valve plumbing as needed
to access the booster.
7. Remove front cover, sides, top and rear panel to access the
heat exchanger.
8. Remove the drain plug located on the front of the heat
exchanger (do not discard) and allow the water to drain from
the heat exchanger into a pan or receptacle. Exchanger
holds approximately 16 oz. (498 g).
9. Mark and remove the two (2) water fittings and discard old
gaskets (new ones are provided), then position flexible
lines away from harm.
10. Carefully remove insulation from around the heat exchanger
and set aside.
11. Remove the perimeter screws from flue vent collection
hood and carefully lift fan with vent collector hood off of
the top of the heat exchanger. Disconnect fan wires if you
cannot set the hood in a secure nearby location.
12. Remove wires from high limit switch and then remove two
(2) screws that hold switch to exchanger.
13. Remove screws that hold the heat exchanger to combustion
chamber and lift exchanger away. Discard old gasket
between exchanger and combustion chamber (new part
provided).
14. Place new gasket o combustion chamber and position new
heat exchanger on top. Fasten exchanger to combustion
chamber with screws removed earlier.
15. Place new gasket on top flange of heat exchanger and
replace vent collector with power vent fan on top of new
exchanger (reconnect wires if needed) securing with
original screws.
16. Replace insulation around the heat exchanger and fasten
in place with high temperature aluminum tape.
17. Attach high limit switch to exchanger with screws previously
removed, and then attach wire leads to switch.
18. Place new gaskets (provided) onto water fittings and
carefully tighten flexible lines making sure they are oriented
for proper flow.
19. Seal threads of drain plug with a food grade
sealant to prevent
new exchanger.
20. Reconnect water
valve plumbing.
21. Close drain valve under booster heater and turn on water
supply to booster, then turn on electrical supply and allow
pump to displace trapped air out of the new heat exchanger,
then purge this air out of the booster by running several
rinse cycles on the dishmachine. CHECK ALL FITTINGS
FOR LEAKS.
22. Turn on gas supply (CHECK ALL FITTINGS FOR LEAKS)
and follow start-up procedures.
Form No. PMG100200M-0918
COOL DOWN TO
leakage and install
and gas lines and
Blended Phosphate Water Treatment Cartridge
Replacement
1. Shut off electrical power to the heater.
2. Shut off water supply and open drain valve to remove water
in piping.
ROOM
3. Loosen canister using wrench attached.
4. Remove canister and discard depleted cartridge.
5. Use a
canister clean.
NOTE: Make
in canister.
6. Reverse above procedure to reinstall.
in
relief
27
MAINTENANCE
clean damp cloth,
sure O-ring seal is
wipe interior of
properly placed