Honeywell TO485 Product specification sheet

TO485

A

Temperature regulator with balanced single-seat piston valve

(Cooling water regulator)

Product specification sheet

pplication

TO485 temperature regulators are used in commercial and
industrial installations where the operating temperature in the
system is to be limited to a preset value. The TO485
temperature regulator is therefore especially suitable for use
in cooling systems.

The integral strainer protects the regulator against individual
loose dirt particles which may be circulating through the
system. Where dirt is constantly present, a separate
upstream strainer must also be fitted where dirt is constantly
present (see "Accessories").

Special Features

• Actuator with pressure-balanced valve - fluctuating inlet
pressures have no influence on the control temperature

• Integral strainer

• Soft-seat valve

• Thermostat with standard setting range 30 °C to 100 °C

• Over-temperature safety protection at 50 K above the set

value

• Sensor phial with 3m long capillary

• Separate immersion pocket

Construction

The temperature regulator comprises:

• V25 actuator with union connectors

• Integral strainer

• T445 thermostat

Materials

• Brass housing

• Brass union connectors

• Corrosion resistant synthetic material valve seat

• NBR seals

• Stainless-steel strainer

• Nickel-plated brass thermostat immers ion phi al

• Heat conducting sheath between sensor phial and

immersion pocket

• Thermostat can be replaced without draining the system

Range of Application

Medium

Technical Data

Setting range 30 °C to 100 °C (Standard)
Nominal pressure PN 16
Operating pressure

Differential pressure max. 4.0 bar
Operating temperature max. 70 °C
Connection sizes R

Water, oil-free compressed air and
nitrogen up to 70 °C

max. 16.0 bar
For pressures above 13.0 bar a T 447
thermostat relief valve is required

1

/2" to 2"

Subject to change 103 EN0H-1319GE23 R0304

TO485 temperature regulator

A

Method of Operation

The TO485 temperature regulator operates on the expansion
principle. As the temperature at the sensor increases or
decreases, the fill medium expands or contracts and this
causes the piston to move, which then closes or opens the
valve. The valve then permits only the amount of flow of
heating medium to pass through which is required to maintain
the set temperature.

Options

TO485- ... A = Setting range 30 °C to 100 °C
TO485- ... B = Setting range 0 °C to 70 °C

Connection size

Connection size R

1

/2"

3

/4"1"1 1/4"1 1/2"2"
Weight (kg) 4.9 5.1 5.3 6 .2 6.2 8.9
Dimension (mm) L 140 160 180 200 225 255
Max. differential

pressure (bar) 4 4 4 4 4 4
kvs-value 2.4 3.1 7.6 9.1 12.6 12.6

All pressure values given are the excess above atmospheric pressure

ccessories

T447 Thermostat relief valve

A thermostat relief valve must be fitted where
the operating pressure is above 13.0 bar.

FY30

Strainer

with double mesh, brass housing
A = Mesh size approx. 0.35 mm
B = Mesh size approx. 0.18 mm

T447

F76S

Reverse rinsable and cleanable fine filter

AA= With threaded union connectors

upper/lower mesh size 105/135 µm
(DIN/DVGW-tested)

AAM =With threaded union connectors,

F76S

FY30

EN0H-1319GE23 R0304 104 Subject to change

upper/lower mesh size 105/135 µm
(DIN/DVGW-tested), with red-bronze
filter bowl