Honeywell TZ-4 Wiring Diagrams (Fig. 3 and 4)

TZ-4 TOTALZONE® ZONE CONTROL PANEL

5 68-0259-1

Wiring Diagrams (Fig. 3 and 4)

Conventional (RWYG) thermostats can be used to control

conventional, multi-stage, and heat pump equipment. If the

thermostat has a common terminal, it is wired to C on the

panel, see Fig. 3. A multi-stage thermostat is wired with the

second and third stage of heat to W2 and W3 on the panel

thermostat connections, and with the second stage of cooling

to Y2. Leave the zone O/B thermostat jumper on the TZ-4

disconnected. See Single and Multi-Stage Operation in the

Operation section for instructions on staging the TZ-4.

The PC8900 with the W8900A or W8900C can be used as a

zone thermostat. See Fig. 4 for hookup. This thermostat can

be used to control up to 2 heat and 2 cool stages of

conventional equipment. When used to control heat pump

equipment, the W8900A is recommended.

Connect a jumper on the W8900 from Rc to Rh as shown in

Fig. 4. Wire terminals R and C to a transformer. If the system

current draw is within specifications, the R and C on the

W8900 could alternately be connected to R and C on the

TZ-4. The PC8900/W8900 draws 5 VA.

Fig. 3. Typical single-stage thermostat wiring.

M20509B

COMMON (C) TERMINAL IS USED ONLY BY THERMOSTATS

THAT REQUIRE A COMMON WIRE.

MULI-STAGE THERMOSTATS ARE WIRED SIMILARLY BUT WITH

Y2 AND W2 USED FOR SECOND STAGE COOL AND HEAT.

THIRD STAGE OF HEAT (W3) CAN BE WIRED TO W3/AUX.

LEAVE O/B JUMPER ON TZ-4 DISCONNECTED.

TZ-4 THERMOSTAT

CONNECTORS

TYPICAL SINGLE STAGE

THERMOSTAT WIRING