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TZ-4 TOTALZONE® ZONE CONTROL PANEL
15 68-0259-1
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 Switch 4-2
Thermostat On On
Timer On Off
% of Zones Off On
Off Off Off
Table 5. DIP Switch Bank 4, Stage 3 Configuration.
Operation Switch 4-3 Switch 4-4
Thermostat On On
Timer On Off
% of zones calling Off On
Off Off Off
Table 6. DIP Switch Bank 4, Stage Timer Configuration.
Time
DIP Switch
4-5
DIP Switch
4-6
DIP Switch
4-7
5 minutes On On On
10 On On Off
15 On Off On
20 On Off Off
30 Off On On
40 Off On Off
50 Off Off On
60 Off Off Off
Table 7. DIP Switch Bank 5 Settings and Functions.
DIP Switch Function On (Default) Off
5-1 System Type Conventional Heat Pump
5-2 DATS low limit. 40°F 48°F
5-3 Purge mode timing. Two minutes. Three and one-half minutes.
5-4 Fan control during purge. HVAC controlled. Panel controlled.
5-5 Damper control during purge Last zone(s) calling open. All dampers open.
5-6 Fan control in heat. Fan controlled by panel in cool
and HVAC equipment in heat.
Panel in heat and cool controlling
fan.
5-7 Operation of O/B heat pump
changeover equipment terminal.
O/B equipment terminal is
energized in cool (O).
O/B equipment terminal is
energized in heat (B).
5-8 Dual fuel operation. Disabled. Enabled.