Honeywell TP975A, TP975B Installation Instructions

Before Installation

Install

TP975A

with job drawings.

and B Diffuser Thermostat in accordance

Installation

TP975A

and B

Diffuser

Thermostat

Installation Instructions

Mount units with fixed minimum outdoor air dampers such

2. that the thermostat does not see any outdoor air.

General

The TP975 Diffuser Thermostat is designed to provide proportional control for pneumatic valves and mixing boxes in heating or air conditioning systems. It is a one-pipe thermostat which mounts in one end of a slot or light troffer diffuser; or in a return air grille. Air connection is a sharp barb fitting for 5/32

plastic tubing. The TP975 is factory calibrated, however, field calibration is possible. The proportional band (TR) is adjustable from 2 to

The

TP975A

acting. Normal main line pressure is 18

is direct acting while the

1OF.

TP975B

psig

is reverse

PROPORTIONAL BAND ADJ. (TR)

Mounting

The thermostat can be mounted in a variety of positions in fan coil units, return air grilles (wall or ceiling) or in a plenum return The degrees to line up in two different mounting planes,

NOTE: On fan coil units it is not recommended to apply a

setpoint

return air thermostat to a unit with a 100 percent outdoor air damper interference and the probability of reducing air flow across the thermostat.

lever of the TP975 can be rotated 90

Fig. 1. TP975 with

SETPOINT ADJ. LEVER

Setpoint

Lever in Vertical Position. Fig. 2, TP975 with

R974 R973

Setpoint

Lever

Horizontal Position.

95-7152

MOTOR CONTROL AND JCT BOX

TOP GRILLE

PIPING

OPENING

HOLES

MIN

PIPING

OPENING

LOCATE PER

8-32 x3/8 (MAX)

-OPENING FRONT

4070

Fig. 3. Mounting in a Typical Fan Coil Unit.

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