Clayton Steam Master CSMG-15 User Manual Download

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Sect07_CSMG_b.fm

7-8

04/26/2019

Steam Master Instruction Manual

c. Replace the thermocouple lead wire.

d. Repeat steps a, b, and c for the other

MTLC.

If any of the MTLCs are suspected of
being faulty, remove it and conduct
further bench testing. Replace the
MTLC if it is faulty.

7.5

Operating Pressure Switch (OPS)
Adjustment

The OPS can be adjusted to open and stop

the burner at any desired maximum steam pressure
within the operating range of the switch and in
accordance with Clayton prescribed switch setpoint
parameters. The switch has a fixed differential and
will close and restart the burner when steam pres-
sure drops about 8 psi (0.55 bar) below the OPS
setpoint.

To adjust, turn the large slotted screw at the

top of the switch until the dial pointer on the switch
is opposite the maximum desired operating pres-
sure. The dial setting is approximate and final
adjustment should be made (if necessary) by reset-
ting the switch to shut off the burner when desired
maximum pressure is reached on the operating pres-
sure gauge.

7.6

Limit Pressure Switch (LPS)
Adjustment

The LPS is part of the motor circuit. In the

event of excessive steam discharge pressure, this
switch will actuate and shut down the machine
(interrupting the holding circuit). A manual reset is
required before the machine can be restarted.

7.6.1

Adjustment

To set the switch (using scale on switches)

manually increase the OPS and LPS setpoints to
some value above the desired LPS setting (a pres-
sure that is about halfway between the original OPS
setpoint and the opening pressure of the steam
safety relief valve(s)). Operate the machine and

slowly throttle the steam discharge valve to increase
the steam pressure to desired LPS setpoint. Set the
limit pressure switch (dial down) to open (shutting
machine off). Reset the OPS to its original setting
(See paragraph 7.5.).

7.7

Gas Pressure Switches

Damage to burner unit and steam generator will
result from improperly adjusted gas pressure
switches.

Maintenance and repair of the
packaged burner system and its
ancillary devices should ONLY be
performed by Clayton Service or by
Clayton-authorized service technicians.

A set of gas pressure switches, two GPSLs

and a GPSH, are part of the fuel system (See Fig.
7-10.). These switches will initiate a safety shut-
down when gas pressure falls out of range of the
switch’s setpoint.

The low gas pressure switch (GPSL)

closes

on an excessive drop in supply gas pressure; the
high gas pressure switch (GPSH)

opens

on an

excessive rise in burner pressure. If supply gas or
burner pressure exceeds the setpoint of the respec-
tive switch, the burner circuit will open and cause a
complete shutdown of the machine. A manual reset
is required if either switch is actuated.

A manual reset is required on the GPSL

installed at the main gas supply inlet. A manual
reset is required on the GPSH. The GPSH is found
inside the housing of the packaged burner unit.

Note

: Manual reset can be accomplished

without removing the clear cover. To manually
reset the pressure switch, press the spot on the cover
immediately above the red manual reset button
(Fig. 7-10).

If needed, the GPSL/GPSH setpoint may be

adjusted as follows: