Hatco POWERMITE PMG-100 Installation, Operating, Service And Parts Manual page 27

6. Lift and slide burner assembly out.
7. Disconnect spark electrode wire from pilot
igniter.
8. Perform intended service.
9. Reverse above procedure to re-install, checking
burner assembly and seal to prevent gas
leakage.
DRAINING THE HEAT EXCHANGER
1. Shut-off the electrical power, gas and water
supply to the heater.
2. Allow unit to cool down to room temperature.
3. Open the drain valve under the booster heater to
remove water from the tank and pump assembly.
4. Remove the drain plug located on the front of the
heat exchanger and allow the water to drain from
the heat exchanger into a pan or pail.
Approximately 16 oz. (498 g) of water will drain
from the unit.
5. Reverse above procedure using a food grade
thread sealant to seal the plug threads and
prevent leakage.
CAUTION
Failure to drain the heat exchanger prior to
exposing it to freezing conditions will damage
the heat exchanger and void the warranty.
NOTE: Freeze damage to the heat exchanger and
unit can be avoided by doing the following:
• After draining heat exchanger, blow 30 psi of air
into the heat exchanger drain opening which will
purge the exchanger of any residual water.
• Leaving drain valves open until performing start-
up procedures.
• Stop migrating cold air from entering the unit
from the vent.
COMPONENT -
ADJUSTMENTS/REPLACEMENTS
WARNING/CAUTION
Always disconnect the power and shut off gas
supply prior to performing any maintenance on
the booster heater to avoid possible personal
injury or damage to the booster heater.
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
Au moment de l'entretien des commandes,
étiquetez tous les fils avant de les débrancher.
Des erreurs de câblage peuvent entrâiner un
fonctionnement inadéquat et dangereux.
S'assurer que
adéquatement une fois l'entretien terminé.
1. Gas Valve Replacement
a. Shut off electrical power and gas supply to
the heater.
b. Remove front panel.
c. Remove flexible gas piping to gas valve inlet.
d. Disconnect wiring connections to gas valve.
e. Remove burner tray assembly as outlined
above.
f. Remove valve from manifold pipe.
g. Reverse above procedure to re-install,
checking burner and seals to prevent gas
leakage.
2. Ignition Module Replacement
a. Shut off electrical power to the booster.
b. Disconnect spark plug igniter wire.
c. Remove mounting screws holding module.
d. Remove module.
e. Reverse above procedure to re-install.
3. Transformer Replacement
a. Shut off electrical power to the heater.
b. Remove screws from electrical box and lift
off.
c. Disconnect wire leads from transformer at the
power supply. (See Figure 9.)
d. Remove mounting
transformer in place.
e. Remove transformer from unit and replace
with new one.
f. Reverse above procedure to re-install.
25
MAINTENANCE
WARNING
ATTENTION
l'appareil fonctionne
screws that
Form No. PMG-100/200M-0805
hold