Standard Connection; Heat Anticipator Setting; Transformer Protection; Pre- -Start- -Up - Bryant 677E A Series Installation Instructions Manual

Standard Connection

Run the low- -voltage leads from the thermostat, through the inlet
hole, and into unit low- -voltage splice box.
Locate nine 18- -gage wires leaving control box. These low- -voltage
connection leads can be identified by the colors red, green, yellow,
brown, blue, white, pink, black and orange (See Fig. 10). Ensure
the leads are long enough to be routed into the low- -voltage splice
box (located below right side of control box). Route leads through
hole in bottom of control box and make low- -voltage connections
(See Fig. 10). Secure all cut wires, so that they do not interfere with
operation of unit.
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL)
3-PHASE SHOWN
1-PHASE USES
TWO POWER
LEADS
EQUIP GR
CONTROL BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
SPLICE BOX
Fig. 10 - - High- - and Control- -Voltage Connections
IMPORTANT:
Dehumidification control must open control
circuit on humidity rise above set point.
Use of the dehumidification cooling fan speed requires use of
either a 24 VAC dehumidistat or a thermostat which includes
control of a 24 VAC dehumidistat connection. In either case, the
dehumidification control must open the control circuit on humidity
rise above the dehumidification set point.
Heat Anticipator Setting (Electro- - Mechanical
Thermostats only)
The room thermostat heat anticipator must be properly adjusted to
ensure proper heating performance. Set the heat anticipator, using
an ammeter between the W1 and R terminals to determine the exact
required setting.
NOTE: For thermostat selection purposes, use 0.18 amp for the
approximate required setting. Failure to make a proper heat
anticipator adjustment will result in improper operation, discomfort
to the occupants of the conditioned space, and inefficient energy
utilization; however, the required setting may be changed slightly
to provide a greater degree of comfort for a particular installation.
Balance Point Setting- - Thermidistat or Hybrid
Thermostat
BALANCE POINT TEMPERATURE- -The "balance point"
temperature is a setting which affects the operation of the heating
mode. This is a field- -selected input temperature (range 5 to 55_F)
(- -15 to 12_C) where the Thermidistat or dual fuel thermostat will
monitor outdoor air temperature and decide whether to enable or
disable the heat pump. If the outdoor temperature is above the
"balance point", the heat pump will energize first to try to satisfy
the indoor temperature demand. If the heat pump does not make a
sufficient improvement within a reasonable time period (i.e. 15
minutes), then the gas furnace will come on to satisfy the indoor
temperature demand. If the outdoor temperature is below the
POWER
SUPPLY
FIELD-SUPPLIED
FUSED DISCONNECT
WHT(W1)
W/W1
YEL (Y)
Y1/Y
GRN(G)
G
RED(R)
THERMOSTAT
R
(TYPICAL)
BRN(C)
C
BLU(DH)
(DH ON 208/230 VAC
DH
MODELS ONLY)
PINK(Y2)
Y2
BLK(W2)
(W2 ON 208/230 VAC
W2
MODELS ONLY)
ORN(O)
O
A13152
"balance point", the heat pump will not be allowed to operate (i.e.
locked out), and the gas furnace will be used to satisfy the indoor
temperature. There are three separate concepts which are related to
selecting the final "balance point" temperature. Read each of the
following carefully to determine the best "balance point" in a
hybrid installation:
1. Capacity Balance Temperature: This is a point where the
heat pump cannot provide sufficient capacity to keep up
with the indoor temperature demand because of declining
outdoor temperature. At or below this point, the furnace is
needed to maintain proper indoor temperature.
2. Economic Balance Temperature: Above this point, the heat
pump is the most cost efficient to operate, and below this
point the furnace is the most cost efficient to operate. This
can be somewhat complicated to determine and it involves
knowing the cost of gas and electricity, as well as the
efficiency of the furnace and heat pump. For the most
economical operation, the heat pump should operate above
this temperature (assuming it has sufficient capacity) and the
furnace should operate below this temperature.
3. Comfort Balance Temperature: When the heat pump is
operating below this point, the indoor supply air feels
uncomfortable (i.e. too cool). This is purely subjective and
will depend on the homeowner's idea of comfort. Below
this temperature the gas furnace should operate in order to
satisfy the desire for indoor comfort.

Transformer Protection

The transformer is of the energy- -limiting type, however a direct
short will likely blow a secondary fuse. If an overload or short is
present, correct overload condition and check for blown fuse on
Indoor Fan board or Integrated Gas Controller. Replace fuse as
required with correct size and rating.
PRE- - START- - UP
WARNING
!
ENVIRONMENTAL,
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.
2. Do not operate compressor or provide any electric power
to unit unless compressor plug is in place and secured.
3. Do not remove compressor plug until all electrical
sources are disconnected and tagged.
4. Relieve and recover all refrigerant from system before
touching or disturbing compressor plug if refrigerant
leak is suspected around compressor terminals.
5. Never attempt to repair soldered connection while
refrigerant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective goggles and
proceed as follows:
a. Shut off electrical power to unit and install
lockout tag.
b. Relieve and reclaim all refrigerant from system
using both high- - and low- -pressure ports.
c. Cut component connecting tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
13
FIRE, EXPLOSION,