Service instructions – Bell & Gossett V02300D ThermoMate Thermostatic Control Valves User Manual

Page 3

ADJUSTMENT RANGE

Max Temp. °C

(Adj 10

Setting)
Max Temp. °F

52 53.6 55.3 57

63 64.6 66.3 68 69.6 71.3 73

Min. Temp °F

11, 13

14, 16

17, 19

20, 22

23, 25

26, 28

FIG. I

FIG. K

SERVICE INSTRUCTIONS

WARNING: Leakage or corrosion of ThermoMate

are signs of an impending serious failure of the

ThermoMate. Periodically inspect the ThermoMate for
signs of leakage or corrosion. If noted, the failed part or
assembly must be replaced. Failure to follow this instruc-
tion could result in serious personal injury or death and
property damage.

1. Replacement of Bonnet and Gland Assembly

WARNING: Hot system fluid can be hazardous.
Allow the system temperature to cool to 100°F

(37.8°C) or below before attempting any service. Isolate
the ThermoMate from the system or drain system. If sys-
tem is not drained, relieve pressure from the ThermoMate.
Leave drain open during servicing. If servicing a steam
system, make sure that all electrical power is disconnected.
Failure to follow this instruction could result in property
damage and/or moderate personal injury.

a) Remove the valve operator by pushing down on the

operator and turning the knurled union nut counter-
clockwise.

b) Remove the bonnet and gland assembly by turning the

chrome plated bonnet hex nut in a counterclockwise
direction.

c) Inspect the valve seat and remove any foriegn material

that might prevent the ThermoMate from providing pos-
itive shut off. If the valve seat is corroded, the valve
body must be replaced.

d) Install the new bonnet and gland assembly and tighten

securely.

e) Return system to normal operation.
f) Inspect the bonnet and gland assembly for leaks and

tighten additionally if necessary.

g) Reassemble the ThermoMate operator to the valve

body by pushing it down on the brass hex gland and
rotating the operator until you feel the slots in the actu-
ator engage the gland nut. While continuing to push
down, engage and tighten the knurled union nut to
the valve body. It is helpful if the operator is set to the
highest temperature.

2. Replacement of Gland Assembly

a) If the gland assembly is leaking it can be replaced while

the ThermoMate is still pressurized if the valve disc is in
good condition and is backseating properly.

b) Remove the valve operator as in 1(a) above.

WARNING: Hot system fluid can be hazardous.
Allow the system to cool to 100°F (37.8°C) or below

before removing the gland assembly. Failure to follow this
instruction could result in serious personal injury or death
and property damage.

c) Slowly loosen the brass hex gland nut and check for

leakage.

WARNING: If fluid escapes it is a sign that the valve
disc is not backseating properly and a hazardous

condition exists. If leakage is found, STOP. Isolate the
ThermoMate or drain the system before proceeding.
Failure to follow this instruction could result in serious
personal injury or death and property damage.

d) Finish removing the gland assembly.
e) Inspect the bonnet assembly for signs of damage or

corrosion. Replace the bonnet assembly as noted in 1 if
damage is found.

f) Install the new gland assembly and tighten securely.
g) Return the system to normal operation.
h) Check the gland assembly for leakage. Tighten addi-

tionally if necessary.

i) Replace the operator as in 1(g) above.

3. Replacement of Operator

a) Move the operator to the highest temperature setting.

Push down on the operator and unscrew the knurled
union nut (counterclockwise) that attaches the operator
to the valve body.

b) Examine the valve stem and gland assembly for signs of

leakage, if foun replace the gland assembly.

c) Install the new operator by pushing operator down on

the brass hex gland nut while slowly rotating the opera-
tor until you feel the slots in the operator engage the
hex of the gland nut. While continuing to push down,
engage and tighten the knurled nut to the valve body.

d) Set the operator to the desired temperature setting.

FIG. J