TWO-STAGE
(286ANA, 288ANA, 180ANA, 187ANA)
Application Guidelines
Bryant designed and tested the
ambient in cooling is 125_F/51.6_C. On Evolution communicating systems, only low ambient cooling is available to
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
SBristol reciprocating two stage units can utilize either a two stage thermostat or an Evolution communicating User Interface.
SCopeland scroll two stage units must use the Evolution communicating User Interface.
288A Copeland scroll units require Evolution communicating User Interface (UI) to achieve the needed airflow for comfort and efficiency in both low and high stage. The Copeland scroll two stage compressor unloads to 67% of full compressor capacity verses the Bristol reciprocating two stage compressor that decreases to about 50% of full capacity.
Indoor units for the two stage require variable speed indoor blower capabilities. Only unit combinations listed in the two stage Product Data are recommended. Product Data may also include coil only ratings but a variable speed blower is required to achieve comfort and efficiency.
286A/187ANA Bristol Compressor units may use a standard
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.
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 Table 14.)
The model plug is used to identify the type and size of unit to the control. On 286A 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 RCD 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 14—Model Plug Information
| MODEL | PIN RESISTANCE | ||
MODEL | ||||
PLUG | ||||
NUMBER |
|
| ||
NUMBER |
|
| ||
| Pins | Pins | ||
|
| |||
|
|
|
| |
286ANA024 | HK70EZ002 | 5.1 | 18 | |
|
|
|
| |
286ANA036 | HK70EZ004 | 5.1 | 33 | |
|
|
|
| |
286ANA048 | HK70EZ006 | 5.1 | 51 | |
|
|
|
| |
286ANA060 | HK70EZ008 | 5.1 | 75 | |
|
|
|
| |
|
|
|
| |
288ANA024 | HK70EZ010 | 5.1 | 120 | |
|
|
|
| |
288ANA036 | HK70EZ012 | 5.1 | 180 | |
|
|
|
| |
288ANA048 | HK70EZ014 | 5.1 | 270 | |
|
|
|
| |
288ANA060 | HK70EZ016 | 11 | 5.1 | |
|
|
|
| |
|
|
|
| |
180ANA024 | HK70EZ009 | 5.1 | 91 | |
|
|
|
| |
180ANA036 | HK70EZ011 | 5.1 | 150 | |
|
|
|
| |
180ANA048 | HK70EZ013 | 5.1 | 220 | |
|
|
|
| |
180ANA060 | HK70EZ015 | 5.1 | 360 | |
|
|
|
| |
|
|
|
| |
187ANA024 | HK70EZ001 | 5.1 | 11 | |
|
|
|
| |
187ANA036 | HK70EZ003 | 5.1 | 24 | |
|
|
|
| |
187ANA048 | HK70EZ006 | 5.1 | 39 | |
|
|
|
| |
187ANA060 | HK70EZ007 | 5.1 | 62 | |
|
|
|
| |
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