Two-Stage 286B/289B 180B/187B; Application Guidelines; Model Plug - Bryant Base Series Application Manual And Service Manual

Residential Air Conditioners and Heat Pumps Using R-22 and Puron® Refrigerant: Application Guideline and Service Manual

TWO-STAGE 286B/289B 180B/187B

Application Guidelines

Bryant designed and tested the two-stage air conditioner and heat pump
products with Puron refrigerant to operate at a minimum outdoor
operating ambient in cooling mode at 55_F / 12.8_C without low
ambient cooling enabled and the maximum outdoor operating ambient in
cooling is 125_F/51.6_C. On Evolution communicating systems, only
low ambient cooling is available to 0_F/-17.8_C.
The maximum outdoor operating ambient in heating mode is
66_F/18.8_C on all heat pumps. Continuous operation in heating mode
is approved to -30_F/-34.4_C. Thermostat options for the two stage
units are as follows:
• A,B,C,D four-wire connections for Evolution User Interface.
• R,C,W,Y1,Y2, and O
non-communicating thermostat.
286B, 289B, 187B, and 180B units can run, and are matched with, User
Interface (UI) communicating and non-communicating indoor fan coils
and furnaces. Only unit combinations listed in the two-stage Product
Data are recommended.
Line sets for two stage units are similar to the single stage units.
However, some restrictions may apply to specific combinations in long
line applications. Refer to the Long Line Guideline for further
information.
The Tennessee Valley Authority (TVA) requires that electric strip heat
have a lockout feature. This is achieved through Bryant thermostats
required per above and must be used on all TVA approved units.
The new control board in the two stage units with Puron refrigerant has
dip switches for defrost timing. The Evolution controls provide these
two stage units with high stage latching and Hybrid Heatt (dual fuel)
capabilities. The standard Hybrid Heatt (duel fuel) thermostat can be
used on two stage units with Bristol reciprocating compressors only.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
wire connections for standard,

Model Plug

Each control board contains a model plug. The correct model plug must
be installed in order for the system to operate properly. (See
The model plug is used to identify the type and size of unit to the control.
On 286B models, the model plug is also used to determine the start
sequence timing for each individual model.
On new units, the model and serial numbers are inputted into the board's
memory at the factory. If a model plug is lost or missing at initial
installation, the unit will operate according to the information input at
the factory and the appropriate error code will flash temporarily. An RC
replacement board contains no model and serial information. If the
factory control board fails, the model plug must be transferred from the
original board to the replacement board for the unit to operate.
NOTE: The model plug takes priority over factory model information
input at the factory. If the model plug is removed after initial power up,
the unit will operate according to the last valid model plug installed, and
flash the appropriate fault code temporarily.
Table 15 – Model Plug Information
MODEL MODEL PLUG
NUMBER NUMBER
286B024 HK70EZ041
286B036 HK70EZ043
286B048 HK70EZ045
286B060 HK70EZ047
289B024 HK70EZ010
289B036 HK70EZ012
289B048 HK70EZ014
289B060 HK70EZ016
180B024 HK70EZ009
180B036 HK70EZ011
180B048 HK70EZ013
180B060 HK70EZ015
187B0
24 HK70EZ040
187B0
36 HK70EZ042
187B0
48 HK70EZ044
187B0
60 HK70EZ046
52
Table 15.)
PIN RESISTANCE
(K-ohms)
Pins 1-4 Pins 2-3
18 91
18 150
18 220
18 360
5.1 120
5.1 180
5.1 270
11 5.1
5.1 91
5.1 150
5.1 220
5.1 360
18 75
18 120
18 180
18 270