Notes For Figures 28 - Figures 35 - Bryant 820TA Installation, Start-Up, Operating And Service And Maintenance Instructions

820TA/821TA: Installation, Start-up, Operating and Service and Maintenance Instructions
Fig. 33 – Dual-Fuel Thermostat with Two-Stage Furnace and
Two-Speed Heat Pump
Fig. 34 – Two-Stage Thermostat with Two-Stage Furnace and
Two-Speed Air Conditioner
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Fig. 35 – Single-Stage Thermostat with Two-Stage Furnace and
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NOTES FOR FIGURES 28 - FIGURES 35:

1. Heat pump MUST have a high pressure switch for dual fuel
applications.
2. Refer to outdoor equipment Installation Instructions for additional
information and setup procedure.
3. If the heat pump date code is 1501E or earlier, select the "ZONE"
position on the two-speed heat pump control. Heat pumps having
date codes 1601E and later do not have or require a "ZONE"
selection.
4. Outdoor Air Temperature Sensor must be attached in all dual fuel
applications.
5. Dip switch No. 1 on Thermidistat should be set in OFF position for
air conditioner installations. This is factory default.
6. Dip switch No. 1 on Thermidistat should be set in ON position for
heat pump installations.
7. Dip switch No. 2 on Thermidistat should be set in OFF position for
single-speed compressor operation. This is factory default.
8. Dip switch No. 2 on Thermidistat should be set in ON position for
two-speed compressor operation.
9. Configuration Option No. 10 "Dual Fuel Selection" must be turned
ON in all dual fuel applications.
10. NO connection should be made to the furnace HUM terminal when
using a Thermidistat.
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11. Optional connection: If wire is connected, dip switch SW1-2 on
furnace control should be set in ON position to allow
Thermidistat/Thermostat to control furnace staging.
12. Optional connection: If wire is connected, ACRDJ jumper on
furnace control
Thermidistat/Thermostat to control outdoor unit staging.
13. Furnace must control its own high-stage heating operation via
furnace control algorithm.
14. The RVS Sensing terminal "L" should not be connected. This is
internally used to sense defrost operation.
15. DO NOT SELECT the "FURNACE INTERFACE" or "BALANCE
POINT" option on the two-speed heat pump control board. This is
controlled internally by the Thermidistat/Dual Fuel Thermostat.
16. Dip switch D on Dual Fuel Thermostat should be set in OFF
position for single-speed compressor operation. This is factory
default.
17. Dip switch D on Dual Fuel Thermostat should be set in ON position
for two-speed compressor operation.
19
Two-Speed Air Conditioner
should be removed
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to allow