Hatco POWERMITE PMG-100 Installation, Operating, Service And Parts Manual page 29

f. Remove three (3) screws holding the straight
90° elbow duct to the exhaust blower and pull
duct out.
g. Remove three (3) screws holding the straight
duct to the 90° elbow duct and separate.
(Save the screws.)
h. 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.
i. Reassemble top and side panels in reverse
order from above.
j. Remove vent hole cover from right side panel
and place on back panel before reinstalling
side duct letting exhaust duct protrude.
12.Heat Exchanger Replacement
a. Shut off gas supply.
b. Shut off electrical supply.
c. Shut off water supply.
d. ALLOW UNIT TO COOL DOWN TO ROOM
TEMPERATURE.
e. Open the drain valve under the booster
heater to remove water from the tank and
pump assembly.
f. Disconnect water, gas, and relief valve
plumbing as needed to access the booster.
g. Remove front cover, sides, top and rear panel
to access the heat exchanger.
h. 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).
i. Mark and remove the two (2) water fittings
and discard old gaskets (new ones are
provided), then position flexible lines away
from harm.
j. Carefully remove insulation from around the
heat exchanger and set aside.
k. 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.
l. Remove wires from high limit switch and then
remove two (2) screws that hold switch to
exchanger.
m. Remove screws that hold the heat exchanger
to combustion chamber and lift exchanger
away. Discard old gasket between exchanger
and combustion
provided).
chamber (new part
n. Place new gasket o combustion chamber and
position new heat exchanger on top. Fasten
exchanger to combustion chamber with
screws removed earlier.
o. 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.
p. Replace insulation
exchanger and fasten in place with high
temperature aluminum tape.
q. Attach high limit switch to exchanger with
screws previously removed, and then attach
wire leads to switch.
r. Place new gaskets (provided) onto water
fittings and carefully tighten flexible lines
making sure they are oriented for proper flow.
s. Seal threads of drain plug with a food grade
sealant to prevent leakage and install in
new exchanger.
t. Reconnect water and gas lines and relief
valve plumbing.
u. 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
dishwashing
FITTINGS FOR LEAKS.
v. Turn on gas supply (CHECK ALL FITTINGS
FOR LEAKS) and follow start-up procedures.
13.Blended Phosphate Water Treatment Cartridge
Replacement
a. Shut off electrical power to the heater.
b. Shut off water supply and open drain valve to
remove water in piping.
c. Loosen canister using wrench attached.
d. Remove canister and discard depleted
cartridge.
e. Use a clean damp cloth, wipe interior of
canister clean.
NOTE: Make sure O-ring seal is properly placed
in canister.
f. Reverse above procedure to reinstall.
27
MAINTENANCE
around the
rinse cycles on
machine. CHECK
Form No. PMG-100/200M-0805
heat
the
ALL