Honeywell Tz 4 Manual

TZ-4 TOTALZONE® ZONE CONTROL PANEL
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Fig. 16. Wiring conventional heating and cooling equipment to TZ-4 panel.
Heat Pump Equipment
See Fig. 17-22 for heat pump wiring. Refer to manufacturer 
instructions for additional wiring details and substitute the   
TZ-4 equipment terminals for the thermostat terminals shown. 
— Connect the changeover relay to O/B equipment terminal. 
— Set switch number 5-7 to on for O (cool) changeover, or to 
off for B (heat) changeover. 
— Set switch number 5-1 to...

TZ-4 TOTALZONE® ZONE CONTROL PANEL
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Fig. 17. Wiring single-stage heat pump with auxiliary heat.
Fig. 18. Wiring single-stage heat pump with separate 
auxiliary and emergency heat.
Two-speed Compressor: Wire the first stage compressor to 
Y1 and the second stage compressor to Y2.
If the same heat source is used for auxiliary heat and 
emergency heat:
—  Wire a jumper from W3/AUX (auxiliary heat) to W1/E 
(emergency heat), see Fig. 19.
If auxiliary heat is separate from emergency heat:
— Wire...

TZ-4 TOTALZONE® ZONE CONTROL PANEL
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Fig. 21. Dual Fuel with single-stage heat pump and single-
stage fossil fuel.
Fig. 22. Dual fuel with two-stage heat pump and            
one- or two-stage fossil fuel.
Water Source Heat Pumps
Wire the equipment, as applicable, to the TZ-4 as shown in 
Fig. 17-19. Refer to manufacturer instructions for additional 
wiring instructions and substitute the TZ-4 equipment 
terminals for the thermostat terminals shown.
— Wire first stage compressor to Y1, second...

TZ-4 TOTALZONE® ZONE CONTROL PANEL
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Purge Mode
At the end of every call for heat or cool, the panel enters a 
Purge mode that holds open the calling zone damper for two 
(default) or three and one-half minutes.
During this time, the panel or the HVAC equipment can be 
configured to operate the fan. The Purge LED lights to signal 
that the system is in the Purge mode. Pressing the purge 
override button overrides the Purge mode. 
Unless there is a new call for heat or cool during the Purge...

TZ-4 TOTALZONE® ZONE CONTROL PANEL
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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....

TZ-4 TOTALZONE® ZONE CONTROL PANEL
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Thermostat Operation
Conventional Thermostats
Conventional (R,W,Y,G) heat/cool thermostats can be used 
with the TZ-4 to control single or multi-stage gas, electric or oil 
systems and heat pumps with auxiliary heat. 
The panel can be configured to control second stage heat and 
cool and third stage heat using a 5-60 minute timer, or staging 
can be controlled by the percentage of zones calling. 
When using conventional thermostats on heat pump...

TZ-4 TOTALZONE® ZONE CONTROL PANEL
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Use DIP switch 5-2 to change cooling limit settings: 
Zone-A-Lone Switch 
When the Zone-A-Lone switch is in the occupied (up) position 
and the OC/OC terminals are not used, the system functions 
as a zone control system. 
When switched to the unoccupied (down) position, all 
dampers are opened and all requests for heat, cool, or fan, 
except from zone one, are not honored. 
The zone one thermostat becomes the controlling thermostat 
for the entire system....

TZ-4 TOTALZONE® ZONE CONTROL PANEL
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TROUBLESHOOTING 
Table 8. Troubleshooting.
SymptomPossible CauseAction
No LEDs are IlluminatedNo power to the board.Check for 24 Vac (±10%) across R and C.
Transformers out of phaseIf 48 Vac across R and T1, reverse T1 and T2 wires.
Shorted wire.Check thermal circuit breaker. If hot, a short exists in 
thermostat or damper wiring.
Damper LEDs on, but no 
other LEDs illuminated.Insufficient voltage.Check for 24 Vac (±10%) across R and C.
Incorrect...

TZ-4 TOTALZONE® ZONE CONTROL PANEL
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Table 9. LED Indicators.
LEDColorIlluminatedNot IlluminatedFlashing
HeatRedHeat call.No heat calls.High limit reached.
CoolGreenCool call.No cool calls.Low limit reached.
PurgeAmberPurge mode.Not in Purge mode.•DATS failure: slow flash.
•OT failure: fast flash.
•DATS and OT failure: 
alternating fast and slow flash.
FanGreenFan only call.No fan only call.—
EM HeatRedEmergency Heat mode or 
dual-fuel mode.Not in emergency Heat mode or 
dual-fuel mode.—
Zones...

68-0259-1   G.H.   Rev. 12-02 www.honeywell.com/yourhome Automation and Control Solutions
Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN  55422 Scarborough, Ontario
M1V 4Z9
TZ-4 TOTALZONE® ZONE CONTROL PANEL