Honeywell C7735A1000 installation instructions

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INSTALLATION INSTRUCTIONS

69-15 21- 2

C7735A1000 Discharge Air

Temperature Sensor

APPLICATION

The C7735A1000 Discharge Air Temperature Sensor

(DATS) is a duct-mounted temperature probe that

provides capacity control of heating and cooling

equipment. The DATS is used only with zoning solutions,

including TZ-3, MABS EZ-2 and MABS EZ-4, and EMM-

3 and EMM-3U control panels. Mounted in the supply air

duct, the DATS senses the delivered air temperature and

cuts off the heating or cooling when the delivered air

temperature goes above or below normal operating

limits.

When either limit setting is reached, the appropriate heat

or cool light emitting diode (LED) flashes on the TZ-3 or

EMM series panels, indicating that heating or cooling is

shut off. The call still exists and heated or cooled air is

still being supplied to the calling zones. Once the

delivered air temperature drops ten degrees for heating,

or rises ten degrees for cooling, the heating or cooling

equipment is brought back on. The ten-degree

differential provides adequate minimum time-off to avoid

damaging the equipment. EMM series has a 2.5 minute

timer as equipment protection.

The location of the DATS is critical; it should not be

placed in line-of-sight of the heat exchanger or cooling

coil because the DATS could activate prematurely. It

should also be located before the bypass damper, when

applicable. DATS dimensions are shown in Fig. 1.

The DATS requires only two wires. Normal 18 to 22

gauge thermostat wire is used for shorter runs. For

longer runs or when wiring near voltage, shielded cable

is used.

Fig. 1. C7735A dimensions in in. (mm).

INSTALLATION

When Installing this Product...

1. Read these instructions carefully. Failure to follow

them could damage the product or cause a hazard-

ous condition.

2. Check the ratings given in the instructions and on

the product to make sure the product is suitable for

your application.

3. Installer must be a trained, experienced service

technician.

4. After completing installation, use these instructions

to check out the product operation.

IMPORTANT

Do not locate the DATS probe in a duct near the

heat exchanger or strip heat, which can cause

false temperature readings.

1. Locate the DATS on the supply trunk between the

bypass damper and the evaporator coil and/or heat

exchanger. If a bypass damper is not used, locate

the DATS between the zone dampers and the

evaporator coil and/or heat exchanger. See Fig. 2.

Fig. 2. DATS mounting location.

M14926

4-1/8 (102)

3-7/8

(77)

3-3/4

(77)

1-1/4

(25)

ZONE DAMPERS

BY PASS DAMPER

PLACE SENSOR

INTHIS AREA.

DO NOT

PLACE

SENSOR IN

THIS AREA.

M14877

EVAPORATOR COIL

HEAT EXCHANGER

BLOWER