Thermidistat Mode; Continuous Blower Mode; Heat Pump Mode - Bryant H Series Installation, Start-Up, And Operating Instructions Manual

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. Select the "ZONE" position on the two-speed heat pump control.
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 inON 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 turnedON in all dual fuel applications.
10. NO connection should be made to the furnace HUM terminal when using a Thermidistat.
11. The RVS Sensing terminal "L" should not be connected. This is internally used to sense defrost operation.
12. 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.
13. Dip switch D on Dual Fuel Thermostat should be set in OFF position for single-speed compressor operation. This is factory default.
14. Dip switch D on Dual Fuel Thermostat should be set in ON position for two-speed compressor operation.
C. Thermidistat Mode
(See Fig. 48, 49, 50, and 51 for Thermidistat connections.)
The dehumidification output, DHUM on the Thermidistat
should be connected to the furnace control thermostat
terminal DHUM. When there is a dehumidify demand, the
DHUM input is activated, which means 24 vac signal is
removed from the DHUM input terminal. In other words,
the DHUM input logic is reversed. The DHUM input is
turned ON when no dehumidify demand exists. Once 24
vac is detected by the furnace control on the DHUM input,
the furnace control operates in Thermidistat mode. If the
DHUM input is low or OFF for more than 48 hours, the
furnace control reverts back to non-Thermidistat mode.
The cooling operation described in item 2. above also
applies to operation with a Thermidistat. The exceptions are
listed below:
a. When the R to G-and-Y1 circuit is closed and there is a
demand for dehumidification, the furnace blower motor
BLWM will continue running at low-cool speed (same
speed as FAN).
b. When the R to G-and Y/Y2 circuit is closed and there is
a demand for dehumidification, the furnace blower
motor BLWM will drop the blower speed from COOL to
HEAT for a maximum of 10 minutes before reverting
back to COOL speed. If there is still a demand for
dehumidification after 20 minutes, the furnace control
CPU will drop the blower speed back to HEAT speed.
This alternating 10-minute cycle will continue as long as
there is a call for cooling.
c. When the "call for cooling" is satisfied and there is a
demand for dehumidification, the cooling blower-off
delay is decreased from 90 seconds to 5 seconds.
D. Continuous Blower Mode
When the R to G circuit is closed by the thermostat, the
blower motor BLWM will operate on continuous-blower
speed (can be adjusted to FAN, HEAT, or COOL speed) at
the thermostat. Factory default is FAN speed. Terminal
EAC-1 is energized as long as the blower motor BLWM is
energized.
During a call for heat, the blower BLWM will stop during
igniter warm-up (17 seconds), ignition (7 seconds), and
blower-ON delay (66 or 45 seconds for 040 through 120
NOTES FOR FIGURE 48-54
sizes or for 140 size), allowing the furnace heat exchangers
to heat up more quickly, then restarts at the end of the
blower-ON delay period at HEAT speed.
In heating, the furnace control CPU will hold the blower
motor BLWM at HEAT speed during the selected blower-
OFF delay period before reverting to continuous-blower
speed.
When the thermostat "calls for low-cooling", the blower
motor BLWM will switch to operate at low-cool speed
(same speed as FAN). When the thermostat is satisfied, the
blower motor BLWM will operate an additional 90 seconds
on low-cool speed (same speed as FAN) before reverting
back to continuous-blower speed.
When the thermostat "calls for high-cooling", the blower
motor BLWM will operate at COOL speed. When the
thermostat is satisfied, the blower motor BLWM will
operate an additional 90 seconds on COOL speed before
reverting back to continuous-blower speed.
When the R to G circuit is opened, the blower motor
BLWM will continue operating for an additional 5 seconds,
if no other function requires blower motor BLWM opera-
tion.
Continuous Blower Speed Selection from Thermostat
-To select different continuous-blower speeds from the
room thermostat, momentarily turn off the FAN switch or
push-button on the room thermostat for 1-3 seconds after
the blower motor BLWM is operating. The furnace control
CPU will shift the continuous-blower speed from the
factory setting of FAN to HEAT speed. Momentarily
turning off the FAN switch again at the thermostat will shift
the continuous-blower speed from HEAT to COOL. Re-
peating the procedure will shift the continuous-blower
speed from COOL to FAN speed. The selection can be
changed as many times as desired and is stored in the
memory to be automatically used following a power inter-
ruption.
E. Heat Pump Mode
(See Fig. 50, 51, 52 and 53 for thermostat connections.)
When installed with a heat pump, the furnace control
automatically changes the timing sequence to avoid long
blower off times during demand defrost cycles. When the R
to W-and-Y1 or R to W-and-Y1-and-G circuits are ener-
gized the furnace control CPU will switch to or turn on the
blower motor BLWM at HEAT speed, and begin a heating
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