Honeywell R7500C User Manual

R7500C Wide Range Proportional

BEFORE INSTALLATION

Temperature Controller

INSTALLATION INSTRUCTIONS

They are fastened to the mounting surface through the two
diagonally opposed mounting holes in the back of the case.
See Fig. 1.

For access to the mounting holes, remove the cover from the
case by loosening the cover mounting screw.

The mounting holes are now visible through the circuit board
notches in the upper right and lower left-hand corners.

Determine placement of the mounting holes in the surface
and scribe the mounting hole locations. Drill pilot holes and
fasten with No. 10 screws.

RC186

Refer to job drawings for specific installation information and
mounting location. Main and compensation sensors (when
used) must be 500-ohm Balco sensors (L7022, L7025,
L7033, T7506 or T7001).

This controller is surface mounted through the two holes in
the back of the case.

Observe ambient temperature (30 to 140F) (0 to 60C) and
relative humidity (5 to 95%) limitations.

No special tools are required to install this controller.

CAUTION:

This controller requires a 11 to 12V dc power supply
for proper operation. The power may be supplied by
an R7503 Modutrol* Motor Converter, R7504 Two­Position Converter, RP7505 Pneumatic Transducer,
Electronic Modutrol Motors M734K or M745J, any
other device designed for use with this Temperature
Controller, or a separate dc power supply. This
controller outputs 4 to 7 Vdc across the proportional
band setting. It is designed to work with motors and
actuators that expect a 4 to 7 Vdc input signal.

MOUNTING

This controller can be surface mounted in any convenient
location such as on duct walls, end compartments of unit
ventilators, etc.

Fig. 1. Approximate Installation Dimensions in

inches (Millimeters).

Copyright © 1995 Honeywell Inc. • All Rights Reserved

95-7205

R7500C WIDE RANGE PROPORTIONAL TEMPERATURE CONTROLLER

WIRING

All wiring must agree with local electrical codes and
ordinances.

Since the Controller circuits are rated NEC Class 2, some
local codes allow open (no conduit) wiring.

Number 18 gage 1.0 mm insulated wire or two- or three­conductor thermostat cable is acceptable for use with these
Controllers, except on long sensor or remote setpoint
potentiometer runs where a larger wire size should be used.
See T ab le 1.

All control wiring connections to the Controller are made to
the 6-inch (152 mm), color-coded leadwires found bundled
under the cover. There are two orange wires to facilitate
connections to the converter and/or sensors.

Crimp type connectors are recommend for field connections
of the control wiring. Refer to job drawings for specific wiring
information. See Figures 2 through 4 for some typical
wiring diagrams.

IMPORTANT
Observe color-coding of wires when making connections.

BALCO
MAIN SENSOR

1

BLACK

ORANGE

*

ORANGE
YELLOW
VIOLET

R7500

R7503

CONVERTER

*

O
Y
V

POWER

Table 1. Wire Resistance, Ohms per 1,000 Feet (304m).

Wire Gage

Wire Dia.

Size (mm)

Ohms/1000 ft

(304 m) of Wire

18 1.00 6.5
16 1.25 4.0
14 1.60 2.6
12 2.00 1.6
10 2.50 1.0

When determining proper wire size, remember there are two
wires to the sensor and the setpoint potentiometer. Double
the distance to the sensor or potentiometer to obtain the
proper wire length. Calibration of the controller will be
offset approximately 1F (0.5C) for every one ohm of lead
wire resistance.

BALCO MAIN SENSOR

M734K

M745J

14002385-008
REMOTE
SETPOINT
ADJUST

270Ω

3

2

BLK

*

ORN

BRN

R7500

ORN
YEL
VIO

*

O
Y
V

POWER

D
Z
R

1

BROWN

BALCO COMPENSATION
SENSOR

BOTH ORANGE WIRES ARE ELECTICALY IDENTICAL.

*

1

OPTIONAL DISCHARGE COMPENSATION SENSOR.
SUBSTITUTE WITH 500 OHM RESISTOR WHEN
COMPENSATION IS NOT USED.

Fig. 2. Typical Hookup Diagram of R7500C Model with

Integral Setpoint Adjustment.

NOTE: When the compensation sensor is not used,

substitute a 500-ohm resistor and set the
compensation ratio at the maximum setting (20).

95-7205

C7828

BALCO COMPENSATION
SENSOR

CONNECT Z-D FOR DIRECT ACTION; Z-R FOR

1

REVERSE.

2

OPTIONAL DISCHARGE COMPENSATION SENSOR.
SUBSTITUTE WITH 500 OHM RESISTOR WHEN
COMPENSATION IS NOT USED.

MOVE WIPER UP TO RAISE SETPOINT.

3

BOTH ORANGE WIRES ARE ELECTRICALY IDENTICAL.

*

Fig. 3. Typical Hookup Diagram of R7500C with Remote

Temperature Selector.

2

C7829