Electric Heater Replacement; Motor Replacement - Rheem RBHP-17A00NH1 Installation Instructions Manual

• Mark field power supply wiring (for replacement) attached to terminal block or circuit
breaker(s) on blower assembly. Remove wiring from terminal block or circuit break-
er(s).
• Mark low voltage control wiring (for replacement) where attached to unit control termi-
nals on left side of blower housing.
• Remove two screws holding blower assembly to front channel of cabinet and pull
blower assembly from cabinet.
• To replace blower assembly, slide blower assembly into blower deck. Make sure
blower assembly engages lances in deck properly. If assembly hangs up, check to
make sure top and bottom are lined up in proper locations.
• Slide blower assembly to back of cabinet and make sure it is completely engaged.
• Replace two screws holding blower assembly to front channel of cabinet. Take care
not to strip screws, just snug into place.
• Replace low voltage control wiring with wire nuts and make sure wiring is to wiring
diagram and a good connection has been made.
• Replace field power wiring to terminal block or circuit breaker(s) on control area of
blower assembly. Make sure wires are replaced as they were, check wiring diagram if
necessary. Tighten supply power wiring securely to terminals lugs.
• Make sure wiring is within cabinet and will not interfere with access door. Make sure
proper separation between low voltage control wiring and field power wiring has been
maintained.
• Replace blower assembly control access panel before energizing equipment.

12.6 ELECTRIC HEATER REPLACEMENT

With the blower assembly removed, electric heater(s) can be removed and replaced
from the blower housing without disturbing the motor or blower wheel.
• Remove both wires from the heater to be removed and remove three screws from
outside of blower wrap holding heater brackets to blower wrap.
• One screw is located under the control mounting plate and is a little difficult to get at.
A 1/4" box end or open end wrench should be used to remove and replace this screw
• With three screws removed, lift heater element and heater terminals through mount-
ing holes in top of blower wrap.
• Lift heater from blower wrap and with terminal end of heater headed for blower cut off
and to the outside of the blower side, remove heater.
• To replace the heater element, reverse the above process to replace heater.
• Make sure bend on heater near terminals end is down in place flush or below outlet
flanges on blower assembly. Replace screws in heater brackets and tighten.
• Make sure terminals on heater are straight with at least 1/2" clearance to control
mounting plate and 1/2" clearance to access panel. Use a straight edge across front
flanges on blower assembly to check clearance (bend if necessary for proper clear-
ance).
• Replace wiring, make sure connections are tight and are made in accordance with the
unit wiring diagram.

12.7 MOTOR REPLACEMENT

With the blower assembly removed, the indoor blower motor can be removed and
replaced using the following procedure:
• Remove motor leads from the motor high and low voltage plugs. Note the lead loca-
tions for ease of re-assembly.
• Loosen the set screw holding the blower wheel onto the motor shaft. The shaft
extends through the blower hub so that a wrench can be used on the extended shaft
to break the shaft loose if necessary. Be careful not to damage the shaft. Use a wheel
puller on the groove in the hub if necessary.
29