Honeywell Tz 4 Manual

							TZ-4 TOTALZONE® ZONE CONTROL PANEL
11 68-0259-1
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 off for heat pump equipment. 
— Set DIP switches 4-1, 4-2, 4-3, and 4-4. See Single Stage 
and Multi-Stage Operation in the Operation section. 
IMPORTANT
Some heat pump manufacturers (such as York and 
Trane) use the B terminal as the transformer 
common. Do not connect the common from the 
equipment to the zone control panel.Single-Speed Compressor: Wire the compressor to the Y1 
terminal. 
If the same heat source is used for auxiliary heat and 
emergency heat:
— Wire a jumper from W2 (auxiliary heat) to W1/E 
(emergency heat).
— Do not connect W3/AUX. See Fig. 17.
If auxiliary heat is separate from emergency heat:
— Connect the auxiliary heat to W2 jumped to W3/AUX.
—  Connect the emergency heat to W1/E. See Fig. 18. 
M20520B
ZONE DAMPER MOTORS
M1 - common
M4 - power open
M6 - power closed
HVAC Equipment
DIP SWITCH S4 SETTINGS  
1  2ND STAGE OPERATION: TABLE 1
2  2ND STAGE OPERATION: TABLE 1
3  3RD STAGE OPERATION: TABLE 1
4  3RD STAGE OPERATION: TABLE 1
5  STAGE TIMER: TABLE 2
6  STAGE TIMER: TABLE 2
7  STAGE TIMER: TABLE 2
8 UNUSED
DIP SWITCH S5 SETTINGS
1 SYSTEM TYPE
2  DATS LOW LIMIT
3 PURGE TIME
4 PURGE FAN
5 PURGE DAMPER
6 HEAT FAN
7 O/B ENERGIZED
8 DUAL FUEL
LED STATES:
Heat LED      Heating Mode
Flashing Heat LED     High Limit
Cool LED      Cooling Mode
Flashing Cool LED     Low Limit
Purge LED      Purge Mode
Flashing Purge LED  Sensor Failure
Fan LED      Fan Mode
EM Heat LED      EM Heat Mode
TABLE 1#1/#3 #2/#4 OPERATION 1    1      STAT
 1    0      TIMER
 0    1      % ZONES
 0    0      OFF
TABLE 2
#5 #6  #7  TIME
1 1  1 5 MIN
1 1  0 10 MIN
1 0  1 15 MIN
1 0  0 20 MIN
0 1  1 30 MIN
0 1  0 40 MIN
0 0  1 50 MIN
0 0  0 60 MIN
  
 ON  OFF
 1  0
 CONV  HP
 40F  48F
 2.0  MIN  3.5  MIN
 HVAC  PANEL
  NO CHG  OPEN
 HVAC  PANEL
 COOL  HEAT
DISABLED ENABLED R
HRCW1/E
W
2W3/AUXZONE LEDs
ON  Damper open or opening
OFF  Damper closed or closing
MOMENTARY PUSH BUTTONS
Boot – Clears microprocessor
Purge Overide – Bypass Purge Mode
BOOTPURGE
OVERRIDE Single Transformer Heating/Cooling
systems require a jumper to be installed
connecting R
H and RC (factory installed).
1 “C” terminal connection 
  is not required on battery 
  powered, power stealing, 
  or some electromechanical 
 thermostats.
2  Leave jumper disconnected 
  for conventional thermostats.
R
C
T1
T2
AZ2 AZ1
OFF ON
EM
Heat
UnoccupOccup
Zone-
A-Lone
Y1Y2GO/B Heating Transformer
24 VAC
Equip.
Cooling Transformer
First Stage Heating
Second Stage Heating Relay
Third Stage Heating
First Stage Cooling Relay
Second Stage Cooling Relay
Fan Relay
This diagram shows the typicalthree-stage equipment, thermostat,and damper motor connections.For specific wiring for otherthermostats, damper motors, andHVAC Equipment, refer to the
nstallation Instructions.
M6 M4M1
DATS
DATS
1
Zone 4 Thermostat
CR C R
Power-closed
Spring-open
(Model ZD)Power-closed
Spring-open
(Model ARD)Power-closed
Spring-open
(Model ARD)
24VAC, 40VA 
Transformer
(Required if
more than
four dampers
)
24VAC, 40VA 
Transformer
OCOCRemote
Zone-A-Lone
Add-A-Zone
Panel(s)
DAMPER
XFRM
PANEL
XFRM
HEATCOOLPURGEFANEM. HEATZONE 1ZONE 2ZONE 3 ZONE 4
DIP SWITCH S4DIP SWITCH S5
1O
N
2345678 1
O
N
2345678
M6 M4M1
1
Zone 3 Thermostat
M6 M4M1
1
Zone 2 Thermostat
456Z
123X
Power-open
Power-closed
(Opposed Blade
Damper Motors)
O/B Y2 GW2M6M4M1W3/
AUXY1W1/
ER C
Y1 W3/
AUX W2 W1 R CY2GLO/B Y1 W3/
AUX W2 W1 R CY2GLO/B Y1 W3/
AUX W2 W1 R CY2GLO/B Y1 W3/
AUX W2 W1 R CY2GLO/B LO/B Y2 GW2W3/
AUX Y1 W1/
E R C
LO/B Y2 GW2W3/
AUX Y1 W1/
E R C
LO/B Y2 GW2W3/
AUX Y1 W1/
E R C
L
1
Zone 1 Thermostat
ZONE 12Thermostat
DATSOT
OTOT
Sensor130 F
120 F
110 F140 F
150 F
160 F
MAX. DUCT TEMP.
25 F
20 F
15 F35 F 30 F
40 F
45 F
DUAL FUEL OT SETTING
DamperZONE 22ThermostatDamperZONE 32ThermostatDamperZONE 42ThermostatDamper 
						

							TZ-4 TOTALZONE® ZONE CONTROL PANEL
68-0259-1 12
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 the auxiliary heat to W3/AUX.
— Wire emergency heat to W1/E, see Fig.20.Fig. 19. Wiring two-stage heat pump with auxiliary heat.
Fig. 20. Wiring two-stage heat pump with separate 
auxiliary and emergency heat.
Dual Fuel Heat Pumps: Install C7089B1000 Outdoor 
Temperature Sensor to terminals OT and OT.
— Set outdoor sensor setting to:
— Balance point temperature of heat pump or
— Outdoor temperature above which the heat pump is to 
be used and below which the fossil fuel is to be used. 
— Set DIP switch number 5-8 to off for dual fuel operation. 
— Connect compressor to Y1. See Fig. 21.
— Connect fossil fuel heat to W1/E.
— Connect second stage of fossil fuel to W3/AUX. 
— Connect second stage of compressor to Y2. See 
Fig. 22.
M20521B
HVAC Equipment
RHRCW1/E
W
2W3/AUX
Single Transformer Heating/Cooling
systems require a jumper to be installed
connecting R
H and RC (factory installed).
Y
1Y2G
O/B Heating Transformer
24 VAC
Equip.
Cooling Transformer
Auxiliary Heat 
Compressor
Reversing Valve
Fan Relay
1
1
FIELD INSTALLED JUMPER.
M20522B
HVAC Equipment
RHRCW1/E
W
2W3/AUX
Single Transformer Heating/Cooling
systems require a jumper to be installed
connecting R
H and RC (factory installed).
Y
1Y2G
O/B Heating Transformer
24 VAC
Equip.
Cooling Transformer
Emergency Heat
Auxiliary Heat 
Compressor
Reversing Valve
Fan Relay
1
FIELD INSTALLED JUMPER.
1
M20523B
HVAC Equipment
RHRCW1/E
W
2W3/AUX
Single Transformer Heating/Cooling
systems require a jumper to be installed
connecting R
H and RC (factory installed).
Y
1Y2G
O/B Heating Transformer
24 VAC
Equip.
Cooling Transformer
Auxiliary Heat 
First Stage Compressor
Second Stage Compressor
Reversing Valve
Fan Relay
1
1
FIELD INSTALLED JUMPER.
M20524A
HVAC Equipment
RHRCW1/E
W
2W3/AUX
Single Transformer Heating/Cooling
systems require a jumper to be installed
connecting R
H and RC (factory installed).
Y
1Y2G
O/B Heating Transformer
24 VAC
Equip.
Cooling Transformer
Emergency Heat
Auxiliary Heat
First Stage Compressor
Second Stage Compressor
Reversing Valve
Fan Relay 
						

							TZ-4 TOTALZONE® ZONE CONTROL PANEL
13 68-0259-1
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 stage 
compressor to Y2. 
— Connect auxiliary heat to W3/AUX and emergency heat to       
W1/E. 
— If auxiliary heat and emergency heat are the same, wire a 
jumper from W1/E to W3/AUX. 
— Connect changeover relay to O/B equipment terminal. 
— Set DIP switch 5-7 to on for O (cool) changeover, or to off 
for B (heat) changeover. 
— Set DIP switch 5-1 to off for heat pump equipment.
STARTUP AND CHECKOUT
After the installation is complete, verify correct operation:
1.Place the Em Heat switch in the Off (down) position.
2.Place the Zone-A-Lone switch in the Occup/Remote 
(up) position.
3.Verify that DIP switches are set correctly. See 
Sequence of Operation section and Table 8 for correct 
configuration. 
4.Power up the TZ-4 and set the thermostats so no zones 
are calling. The board then enters the Purge mode 
where all dampers open and the fan operates for two or 
three and one-half minutes (configurable). (If there is no 
Discharge Air Temperature Sensor connected to the 
panel, the purge LED flashes in all modes other than 
purge.) The damper LEDs are green to indicate the 
dampers are open. Press Purge Override button on 
panel to exit Purge mode. 
5.Set zone one thermostat to heat and raise the setpoint 
to call for heat. Verify that the heat LED is red and zone 
one damper remains green while the other damper 
LEDs turn off.
6.Raise zone two setpoint to call for heat. Lower zone one 
setpoint to stop the call for heat to that zone. Verify that 
zone one LED turns off and zone two LED turns green.
7.Repeat for zones three and four.
8.Alternately, lower the setpoint to call for cooling. Verify 
that the green cool LED illuminates.
OPERATION
Identifying DIP Switches
This panel has two banks of DIP switches, DIP switch 4 (S4) 
and DIP switch 5 (S5). Each bank has eight individual 
switches that are identified by two numbers; the first number 
is the bank number (4 or 5) and the second number identifies 
the individual switch. For example, DIP 5-1 is bank 5, 
switch 1.
Sequence of Operation
• When there is no call for heat, cool or fan, the board is in 
idle mode, no system LEDs are illuminated and the green 
damper LEDs indicate open. 
• On a call for heat, cool, or fan, the calling zone damper 
stays open, and other zone dampers close:
— TZ-4 panel energizes the HVAC equipment and condi-
tioned air is delivered to the calling zone. 
— Heat LED (red), cool LED (green), or fan LED (green) 
illuminates to indicate equipment operation. 
— Fan LED illuminates only on a call for circulation; it 
does not illuminate during a call for heat or cool. 
— When the call is satisfied, the system enters the Purge 
mode. After purge, all dampers return to the Open 
position, depending on the setting of DIP switch S5-5. 
• Any zone thermostat can call for heating or cooling. If there 
are co-existing calls for heat and cool, the panel accepts 
the first call. 
• Once that call is satisfied, or a maximum of 20 minutes has 
elapsed, the panel switches to allow the opposite call after 
completing Purge mode.
M20525A
HVAC Equipment
RHRCW1/E
W
2W3/AUX
Single Transformer Heating/Cooling
systems require a jumper to be installed
connecting R
H and RC (factory installed).
Y
1Y2G
O/B Heating Transformer
24 VAC
Equip.
Cooling Transformer
First Stage Fossil Fuel
First Stage Compressor
Reversing Valve
Fan Relay
M20526A
HVAC Equipment
RHRCW1/E
W
2W3/AUX
Single Transformer Heating/Cooling
systems require a jumper to be installed
connecting R
H and RC (factory installed).
Y
1Y2G
O/B Heating Transformer
24 VAC
Equip.
Cooling Transformer
First Stage Fossil Fuel
Second Stage Fossil Fuel
First Stage Compressor
Second Stage Compressor
Reversing Valve
Fan Relay 
						

							TZ-4 TOTALZONE® ZONE CONTROL PANEL
68-0259-1 14
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 
mode, all dampers are moved to the Open position at the end 
of purge. 
The panel can be configured to open all dampers during the 
purge mode.
Individual Zone Fan Control
When all zones are satisfied, the fan switch of each 
thermostat controls the fan operation for that zone. 
— When the fan switch is in the On position, the fan is 
energized, and dampers close to zones where fan switch is 
in Auto position.
— During a call for heat or cool at this time, the circulation 
mode ceases, and the heat or cool call is honored. 
— When the zone calling is satisfied, the circulation call 
resumes.
Single and Multi-Stage Operation
The panel can control up to three stages of heating and two 
stages of cooling:
— First stage is energized by the thermostat. 
— Second stage of heating or cooling and third stage of 
heating can be energized by the thermostat, timer, or the 
percentage of zones calling. (For instance, first and second 
stage of heat and cool can be thermostat energized and 
third stage heat can be configured for timer energizing.)
— See Tables 5 and 6 for second and third stage 
configuration. Note that second and third stage can be 
controlled differently. Set stages not used to Off.DIP Switch bank 4, switches 1-4, are used to configure the 
staging method: 
— Switches 1 and 2 configure second stage control. See 
Table 4.
— Switches 3 and 4 configure third stage control. See Table. 
5.
— When stage two or three is not used, disable that stage by 
turning off the corresponding switches. 
Single Stage
If equipment is single stage, set bank 4, DIP switches 1-4 Off:
THERMOSTAT-CONTROLLED STAGES
Use a thermostat that energizes W2 and Y2 for second stage 
of heat and cool, and W3 for third stage of heat. Configure for 
thermostat as shown in Tables 4 and 5.
TIMER-CONTROLLED STAGES 
— The Timer energizes second stage of heat or cool after the 
first stage begins calling for the set amount of time.
— The third stage of heat is energized once the second stage 
of heat is calling for the set amount of time.
— Second and third stages remain energized until the call for 
heat or cool is satisfied.
See Table 6 for stage timer configuration of DIP switch bank 4, 
switches 5, 6, and 7.
PERCENTAGE OF ZONES CALLING—CONTROLLED STAGES
Percentage of zones calling energizes second or third stage 
based on the percentage of zones called for heat or cool on 
the TZ-4 and TAZ-4. 
The percentage of zones necessary to turn stages two and 
three on and off:
DIP Switch 
NumberStatusPurge Operation
5-3Off3.5 minutes
5-3On2 minutes
5-4OffPanel control of fan in 
purge
5-4OnHVAC control of fan 
in purge
5-5OffAll dampers open 
during purge
5-5On Damper positions 
unchanged during 
purge
DIP Switch 
NumberStageStatus
4-12nd Sta geOff
4-22nd Sta geOff
4-33rd StageOff
4-43rd StageOff
StageOnOff
Stage 2 Heat>33%33%66%
						

							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.
TimeDIP Switch 
4-5DIP Switch
 4-6DIP Switch 
4-7
5 minutesOnOnOn
10OnOnOff
15OnOffOn
20OnOffOff
30OffOnOn
40OffOnOff
50OffOffOn
60OffOffOff
Table 7. DIP Switch Bank 5 Settings and Functions.
DIP Switch Function On (Default) Off
5-1System TypeConventionalHeat Pump
5-2DATS low limit.40°F48°F
5-3Purge mode timing.Two minutes.Three and one-half minutes.
5-4Fan control during purge.HVAC controlled.Panel controlled.
5-5Damper control during purgeLast zone(s) calling open.All dampers open.
5-6Fan control in heat.Fan controlled by panel in cool 
and HVAC equipment in heat.Panel in heat and cool controlling 
fan.
5-7Operation 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).
5-8Dual fuel operation.Disabled.Enabled. 
						

							TZ-4 TOTALZONE® ZONE CONTROL PANEL
68-0259-1 16
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 
applications, set DIP switch 5-1 to Off for heat pump 
equipment. Set DIP switch 5-7 for correct reversing valve 
operation. See Table 7.
Heat Pump Thermostats
HEAT PUMP THERMOSTATS WITH SINGLE Y OUTPUT
Thermostats that have a single Y terminal for first stage heat 
and cool and those with separate Y1 and W1 can be used. 
Thermostats of either wiring type can be used on any zone.
For thermostats with a single Y, the reversing valve wire must 
be connected to O/B: 
— Connect the thermostat Y terminal to Y1 on the panel. 
— If the thermostat energizes O on a call for cool, connect the 
O/B jumper located near the thermostat wiring terminals.
—  If the thermostat energizes B on a call for heat, leave the 
O/B jumper disconnected.
HEAT PUMP THERMOSTATS WITH SEPARATE Y1 AND W1 
TERMINALS
Heat pump thermostats with separate Y1 and W1 terminals for 
first stage heat and cool are wired to Y1 and W1/E. Leave the 
O/B jumper, located near the thermostat wiring terminals, 
disconnected.
Emergency Heat Control
Emergency heat is defined as using an auxiliary heat source 
without using the heat pump. When the Em Heat switch is in 
the emergency heat position, the heat pump is locked out and 
calls for heat are sent to the W1/E equipment terminal for 
fixed stage emergency heat. Second stage emergency heat 
energizes equipment terminals W3/Aux. Second stage 
emergency heat is configured with DIP switch S41 and 2. 
When the panel is in the heat pump mode, W1/E is energized 
only in emergency heat.
A recommended heat pump thermostat can also control 
emergency heat from the thermostat system switch. See 
Table 1.
Multi-Stage Thermostats
Use multi-stage thermostats to control up to three stages of 
heat and two stages cool with the W1/E,W2, W3/AUX, Y1, 
and Y2 thermostat terminals. 
Manual and Automatic Changeover Thermostats
Manual or automatic changeover thermostats can be used. 
The panel determines the call for heat or cool based on which 
was called for first. Subsequent calls for heat or cool are 
honored when the initial call is satisfied, or 20 minutes has 
elapsed. 
Rebooting Microprocessor 
To reset the panel, press and release the Boot button.The 
system reboots and enters the Purge mode. 
Discharge Air Temperature Sensor
The C7735A1000 Discharge Air Temperature Sensor (not 
included) is a supply-duct-mounted temperature probe used 
to control capacity and prevent high limit or coil-icing. The 
sensor attaches to the two DATS terminals on the panel. 
When a high or low limit is reached, the panel shuts off the 
equipment and keeps the fan operating for 2-1/2 minutes. 
After this time, it re-energizes the equipment after the 
discharge air recovers by 10 degrees. When the DATS 
exceeds the high or low limit, the Heat (red) or Cool (green) 
LED flashes.
Set the temperature from 110°F to 160°F. See Fig. 23. The 
recommended setting for fossil fuel/ electric systems is 160°F 
(default factory setting). For heat pump systems, the 
recommended setting is 120°F.   When using a heat pump 
with dual fuel activated (DIP 5-8), the high limit will auto-
matically be set for 120 degrees when the outputs call for 
compressor only operation. When the outputs call for non-
heat pump operation, the high limit will be set to the adjustable 
110° to160°F setting.
The cooling temperature limit can be set at 40°F or 48°F. 
Fig. 23. DATS high-limit temperature dial.
IMPORTANT
Be sure the Discharge Air Temperature Sensor wir-
ing does not run parallel with line voltage wiring 
unless more than 12 in. of separation exists or 
shielded cable is used.
130  F
MAX DUCT
TEMP
M19079A
120  F
110  F
140  F
150  F
160  F 
						

							TZ-4 TOTALZONE® ZONE CONTROL PANEL
17 68-0259-1
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. During long unoccupied periods, one 
thermostat can be set back instead of adjusting each zone 
thermostat in the building. 
The T8601D2027 and T8611G2051 include two OC terminals. 
When wired to the TZ-4 OC terminals, and with the Zone-A- 
Lone switch in the occupied (up) position, the board enters the 
unoccupied mode during the Leave and Sleep programs. This 
feature requires two extra wires to the Zone 1 thermostat. 
Circuit Breaker Protection 
A built-in thermal circuit breaker protects the TotalZone panel. 
This circuit breaker protects the panel against shorts in the 
thermostat and damper wiring. It does not protect against 
shorts in the wiring of the HVAC equipment into the panel.When the circuit breaker is tripped, none of the LEDs 
illuminate and the yellow rectangular component located left 
of the R and C terminals is hot to touch. Remove power to the 
panel for at least five minutes to allow the circuit breaker to 
cool off and reset. To eliminate the short, verify the dampers 
and thermostat wiring.
Fan On In Heat
The system blower can be set to come on with a call for heat 
as required for hydro-air or electric heat systems. Set the 
blower function using DIP switch 5-6.
When DIP switch 5-1 is set to Off for heat pump control, the 
panel brings the fan on with a call for heat and a call for cool.
TotalZone Add-A-Zone Panels
Using TotalZone Add-A-Zone Panels, the system can be 
expanded to up to 32 zones using TAZ-4 Add-A-Zone panels. 
Two wires connect the AZ1 and AZ2 terminals on the TZ-4 to 
the matching terminals on the TAZ board(s).
See Fig. 15 and the TAZ installation instructions for more 
information.
Dip SwitchStatus
Cooling Temperature 
Limit
5-2On40°F
5-2Off48°F
DIP Switch 5-6Fan Control
OnHVAC system 
OffFan on in heat 
						

							TZ-4 TOTALZONE® ZONE CONTROL PANEL
68-0259-1 18
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 configuration.Check jumpers and DIP switches for correct configuration.
Heat pump operates 
incorrectly or not at all.Incorrectly wired.Verify equipment and thermostat terminal wiring.
Incorrectly configured.Verify DIP switch configuration.
Verify position of O/B thermostat type jumper.
Erratic OperationEmergency Heat switch 
on.Turn off (down) Emergency Heat switch.
Zone-A-Lone Feature on.Turn off (up) Zone-A-Lone.
Heat LED flashing.High limit reached.LED stops flashing with ten-degree fall and 2-1/2 minute 
delay.
Cool LED flashing.Low limit reached.LED stops flashing with ten-degree rise and 2-1/2 minute 
delay.
Purge LED flashes 
continuously.DATS or OT problem or not 
connected.Verify that DATS and OT (if any) are connected and wired 
correctly.
Add-A-Zone not operating. Incorrectly configured.
Verify DIP switch settings on the TAZ panels.
Incorrectly wired.
Check AZ1and AZ2 for correct wiring.
Verify that a separate transformer is used for each TAZ-4 
panel.
Be sure that AZ1 and AZ2 are at least 12 in. from line voltage 
wiring. 
						

							TZ-4 TOTALZONE® ZONE CONTROL PANEL
19 68-0259-1
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 
1,2,3.4GreenDamper is open or 
opening.Damper is closed or closing.— 
						

							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