Honeywell TZ-4 STARTUP AND CHECKOUT, OPERATION

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.

M20525

HVAC Equipment

/AUX

Single Transformer Heating/Cooling

systems require a jumper to be installed

connecting R

and R

(factory installed).

O/B

Heating Transformer

24 VAC

Equip.Cooling Transformer

First Stage Fossil Fuel

First Stage Compressor

Reversing Valve

Fan Relay

M20526