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MAINTENANCE
TROUBLESHOOTING GUIDE
Form No. EBOOSTERBWM-1009
14
General
ELECTRIC SHOCK HAZARD:
• Turn power OFF at disconnect switch/circuit breaker
and allow unit to cool before performing any
maintenance or cleaning.
• This unit must be serviced by qualified personnel only.
Service by unqualified personnel may lead to electric
shock or burn.
IMPORTANT! Many times when a booster water heater does
not appear to be functioning properly, the fault is not with the
booster water heater itself but with factors outside the heater.
Before proceeding with the troubleshooting charts, perform the
following steps first.
1. Check the temperature of the water feeding into the
booster tank. It must be 110° to 140°F (43° to 60°C)
depending on the heating capability of the unit. The inlet
water supply must be in sufficient quantity to hold its
temperature throughout the dishwashing operation.
2. If incoming water exceeds 20 psi (138 kPa), a pressure
reducing valve must be installed.
3. If the wash tank of the dish machine is filled through the
booster water heater, this will use up all of the 180°F (82°C)
water in storage. Sufficient time must be allowed to reheat
the water in storage before starting the dishwasher.
WARNING
4. Booster water heater voltage must be correct for the
voltage available. Check nameplate on the booster water
heater for full information.
5. Water pressure at the inlet to the booster water heater must
be adequate for proper operation of the rinse cycle of the
dish machine, not to exceed 20 psi (138 kPa). Check with
dish machine manufacturer for specific details.
6. The breakers or fuses MUST be sized properly.
7. Be sure that the temperature/pressure relief valve is one
supplied by Bradford White and is installed properly.
8. A check valve should not be installed ahead of the booster.
NOTE: If a check valve is installed and cannot be removed,
install a back pressure relief valve set at 125 psi
(862 kPa) on the incoming line between the pressure
reducing valve and the inlet to the booster water
heater. Discharge must be to open site drain.
9. Primary water heater temperature should not exceed 160°F
(71°C).
High Temperature Limit Safety Switch
Bradford White Commercial Electric Booster water heaters are
equipped with a manually reset high temperature limit safety
switch. If the temperature of the water in the heater exceeds
210°F (99°C) the safety switch will shut off the power. The
switch must be reset manually by pushing the red button.
Use the following procedure if the high temperature limit safety
switch needs to be reset.
1. Remove the access cover (see Figure 11).
2. Push the red reset button on the high temperature limit
safety switch.
Figure 13. High Temperature Limit Safety Switch
3. If tripping repeats, call an Authorized Service Agent.
Red Reset Button
Blended Phosphate Treatment System
(optional)
The Blended Phosphate Water Treatment System dispenses a
small amount of polyphosphate into the water before the water
enters the booster water heater. The mineral molecules in the
water, which have a positive charge, are attracted to the
negative charge of the polyphosphate. The mineral molecules
are unable to join together, so scale is unable to form. Use the
following procedure to replace a blended phosphate cartridge.
1. Shut off electrical power to the booster water heater.
2. Shut off the inlet water supply and open drain shut-off valve
to remove water in piping.
3. Loosen canister using wrench attached.
4. Remove canister and discard depleted cartridge.
5. Using a clean damp cloth, wipe interior of canister clean.
NOTE: Make sure the o-ring seal is placed properly in canister.
6. Reverse procedure to reinstall.