Heat Pump Operation; Dual Fuel Operation; Dip Switch Bank 5 Settings And Functions - Honeywell TotalZone TZ-4 Product Data

HEAT PUMP OPERATION

The panel can control single- or two-stage heat pumps with or
without auxiliary heat. Set DIP switch 5-1 to Off for heat pump
control. This energizes equipment terminal Y1 on a call for
first stage heat or cool. If second stage is configured to
operate with DIP switch 4-1 and 4-2, Y2 energizes to call for
second stage compressor. When in heat pump mode, the
panel energizes the fan with a call for heat and a call for cool.
Configure DIP switch 5-7 for correct changeover valve control.
See Table 7.

DUAL FUEL OPERATION

The panel can control a heat pump and a fossil fuel furnace in
a dual-fuel application. A C7089B1000 Outdoor Temperature
Sensor is wired to the OT and OT terminals on the TZ-4 to
switch the panel from heat pump to fossil fuel operation. DIP
switch 5-8 is set to Off to enable dual-fuel operation.
The dual-fuel OT setting (see Fig. 16 for location) is set to the
outdoor temperature that locks out the heat pump and uses
the fossil fuel mode. The fan is energized by the panel for two
minutes after the changeover and the Em Ht LED illuminates
when in the fossil fuel mode.
IMPORTANT
A C7089B1000 Outdoor Temperature Sensor and a
C7735A1000 Discharge Air Temperature Sensor are
required for dual fuel operation.
Table 4. DIP Switch Bank 4, Stage 2 Configuration.
Operation Switch 4-1
Thermostat On
Timer On
% of Zones Off
Off Off
DIP Switch
5-1 System Type
5-2 DATS low limit.
5-3 Purge mode timing.
5-4 Fan control during purge.
5-5 Damper control during purge
5-6 Fan control in heat.
5-7 Operation of O/B heat pump
changeover equipment terminal.
5-8 Dual fuel operation.
Switch 4-2
On
Off
On
Off
Table 7. DIP Switch Bank 5 Settings and Functions.
Function
Conventional
40°F
Two minutes.
HVAC controlled.
Last zone(s) calling open.
Fan controlled by panel in cool
and HVAC equipment in heat.
O/B equipment terminal is
energized in cool (O).
Disabled.
TZ-4 TOTALZONE® ZONE CONTROL PANEL
Table 5. DIP Switch Bank 4, Stage 3 Configuration.
Operation
Thermostat
Timer
% of zones calling
Off
Table 6. DIP Switch Bank 4, Stage Timer Configuration.
DIP Switch
Time
5 minutes
10
15
20
30
40
50
60
On (Default)
15
Switch 4-3 Switch 4-4
On On
On Off
Off On
Off Off
DIP Switch
4-5 4-6
On On
On On
On Off
On Off
Off On
Off On
Off Off
Off Off
Off
Heat Pump
48°F
Three and one-half minutes.
Panel controlled.
All dampers open.
Panel in heat and cool controlling
fan.
O/B equipment terminal is
energized in heat (B).
Enabled.
DIP Switch
4-7
On
Off
On
Off
On
Off
On
Off
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