Bryant SINGLE PACKAGED HEAT PUMP UNITS 657A - Manual (Page 14)

WARNING: Before performing service or maintenance
operations on the system, turn off main power to unit and
install lockout tag or electrical shock could result.
1. Open all electrical disconnects and install lockout tag before
starting any service work.
2. Remove indoor coil access panel (See Fig. 12).
3. Locate lances in unit base insulation that are placed over the
perimeter of the vertical duct opening cover (See Fig. 13).
4. Using a straight edge and sharp knife, cut and remove the
insulation around the perimeter of the cover. Remove the
screws securing the cover to the unit base and slide out the
cover. Discard the cover.
5. Remove indoor blower access panel (See Fig. 14).
6. Disconnect the plug assemblies from the indoor-fan motor
(See Fig. 15 & 17).
7. Remove screws securing indoor blower housing to blower
shelf and carefully slide out blower housing. There is a filler
bracket attached to the blower shelf; remove this filler
bracket and retain for later use (See Fig. 16).
8. Locate lances in unit base insulation that are placed over the
perimeter of the vertical discharge opening cover (See Fig.
13).
9. Using a straight edge and sharp knife, cut the insulation
around the perimeter of the cover. Remove the screws
securing the cover to the unit base and slide out the cover.
Discard the cover. Install filler bracket removed in Step 6.
10. If unit ductwork is to be attached to vertical opening flanges
on the unit base (jackstand applications only), do so at this
time.
11. It is recommended that the unit base insulation around the
perimeter of the vertical opening be secured to the unit base
with aluminum tape to prevent the insulation from tearing
or bunching up when the blower housing is installed in the
vertical discharge position.
12. Remove screws securing the high-voltage raceway to duct
panel. Temporarily place raceway on top of unit until
blower housing is installed.
13. Orient blower housing for vertical airflow (blower motor
adjacent to horizontal duct opening) and slide into vertical
opening making sure the flanges on the blower side plates
engage the tabs in the unit base (See Fig. 15). Resistance
will be felt as the blower housing contacts the unit base
insulation; this can be overcome by applying a slight force
to the base of the blower. Continue sliding blower in until
hole in side plate flange aligns with the hole in the unit base.
Secure using screw removed in Step 6.
14. Reinstall the high-voltage raceway removed in Step 12.
15. Cover the horizontal duct openings. Duct covers can be
ordered as an accessory or field fabricated (See Fig. 20).
16. Reinstall the indoor coil and indoor blower access panels.
17. After completing unit installation, perform all safety checks
and power up unit.
VIII. INSTALL ELECTRICAL CONNECTION
WARNING: The unit cabinet must have an uninter-
rupted, unbroken electrical ground to minimize the pos-
sibility of personal injury if an electrical fault should
occur. This ground may consist of an electrical wire
connected to the unit ground lug in the control compart-
ment, or conduit approved for electrical ground when
installed in accordance with NEC (National Electrical
Code) ANSI/NFPA (latest edition) and local electrical
codes. In Canada, follow Canadian Electrical Code CSA
(Canadian Standards Association) C22.1 and local elec-
trical codes. Failure to adhere to this warning could result
in personal injury or death.
CAUTION: Failure to follow these precautions could
result in damage to the unit being installed:
1. Make all electrical connections in accordance with
NEC ANSI/NFPA (latest edition) and local electrical
codes governing such wiring. In Canada, all electrical
connections must be in accordance with CSA standard
C22.1 Canadian Electrical Code Part 1 and applicable
local codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit.
DO NOT USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within
operating voltage range indicated on unit rating plate.
4. Do not damage internal components when drilling
through any panel to mount electrical hardware, con-
duit, etc. On 3-phase units, ensure phases are balanced
within 2 percent. Consult local power company for
correction of improper voltage and/or phase imbal-
ance.
A. HIGH-VOLTAGE & CONTROL-VOLTAGE CONNEC-
TIONS
The unit must have a separate electrical service with a field-
supplied, waterproof, disconnect switch mounted at, or within
sight from, the unit. Refer to the unit rating plate for maximum
fuse/circuit breaker size and minimum circuit amps (ampacity) for
wire sizing. See Table 3 for electrical data.
The field-supplied disconnect switch box may be mounted on the
unit over the high-voltage inlet hole when the standard power and
low-voltage entry points are used. See Fig. 21 for acceptable
location.
See unit wiring label and Fig. 23, 24 & 26-27 for reference when
making high voltage connections. Proceed as follows to complete
the high-voltage connections to the unit.
If the unit has an electric heater, a second disconnect may be
required. Consult the Installation Instructions provided with
the accessory heater for electrical service connections.
1. ROUTING POWER LEADS INTO UNIT-Use only copper
wire between disconnect and unit. The high-voltage leads
should be in a conduit until they enter the duct panel;
conduit termination at the duct panel must be watertight.
Run the high-voltage leads through the knockout on the
duct panel (see Fig. 21 for location and size). When the
leads are inside the unit, run leads up the high-voltage
raceway to the line wiring splice box (Fig. 22). For
single-phase units, connect leads to the black and yellow
wires (see Fig. 24 & 26-27).
2. CONNECTING GROUND LEAD TO WIRE-BINDING
SCREW - Refer to Fig. 22. Connect the ground lead to the
chassis using the wire-binding screw in the wiring splice
box.
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