Market Forge PS-3E Service Manual

PS-3E AND PS-6E

ELECTRIC CONVECTON STEAMERS

PARTS AND SERVICE MANUAL

EFFECTIVE AUGUST 1, 2014

The Company reserves the right to make substitution in the event that items specied are not available.

ERRORS: Descriptive and/or typographic errors are subject to correction.

44 Lakeside Avenue, Burlington, Vermont 05401 USA Telephone: [phone] Fax: [phone]

Superseding All Previous Parts Lists.

MARKET FORGE INDUSTRIES

www.mi.com

P/N 14-0285 Rev A (8/14)

TABLE OF CONTENTS

SERVICE AND ADJUSTMENTS .........................................................3

WIRING DIAGRAMS ...................................................................4

ILLUSTRATED PARTS LIST ............................................................7

SERVICE AND ADJUSTMENTS

NOTICE

Contact the factory, the factory representa­tive or local service company to perform any
maintenance and repairs.

ADJUSTMENT FOR HIGH ALTITUDE LOCATIONS

The steamer has been factory set so that when it is ON
and during the READY phase, it will maintain water tem­perature in the steam generator tank at approximately
205° Fahrenheit (just below water boiling point). Howev­er, for high altitude locations, an authorized service agent
must adjust the steamer to achieve this temperature. To
adjust:

1. Remove side panel and turn control panel power
switch to ON.

2. Open compartment door, and after about 15 minutes,
steam will be seen, entering the cooking compart­ment.

3. Turn thermostat dial counter clockwise to lower tem­perature until steam just ceases to enter cooking
compartment and READY light goes on.

4. Replace side panel.

• READY light does not come on after about 15 min­utes,

• Water begins to overow into cooking compartment,

• Water ll solenoid valve is open, then any or all of

these symptoms may indicate a problem with the
operating probe due to either:

1. A short between the operating probe terminal and
body of the steamer. Call your authorized service
agent.

2. Excessive scale build-up on the operating probe.
This acts as an “insulation” and prevents the probe
from sensing the water level. It is therefore unable

to close the water ll (solenoid) valve to shut off the

water.

As a temporary solution, with power OFF, unscrew
probes, check visually, and clean or chip off scalant. Re­place probe.

This problem is an indication of severe harmful water con­ditions which should be corrected immediately to avoid
damage to the components and ultimate malfunction of
the steamer. (See WATER CONDITIONING in this man­ual).

5. Follow TESTING PROCEDURES in this manual.

WATER FLOWS INTO DRAIN DURING SHUTDOWN

When steamer is shut down and cold water is running
continuously into the open drain, either or both solenoid
valves did not close when steamer was turned off.

1. Disassemble solenoid valve(s) and examine for scale
or foreign particles lodged in diaphragm or core tube.

2. Clean valve(s) thoroughly and reassemble, or replace
valve(s).

DRAIN WATER TEMPERATURE TOO LOW OR TOO
HIGH

Cooling solenoid valves are adjustable with ne adjust­ment screw on the bottom of the valve.

1. Run cooking compartment empty until drain tempera­ture stabilizes.

2. Turn ne adjustment screw on cooling solenoid valve
out to decrease drain temperature and in to increase
drain temperature.

WATER OVERFLOWS INTO COOKING COMPART­MENT

When steamer is rst turned on for the day, and the fol­lowing conditions occur:

HEATER ELEMENTS DO NOT COME ON

When the steamer is turned ON and heater elements do
not activate, and therefore, the READY light does not
come on, then the contactors may be burned out. If a
considerable amount of “chattering” of contactors has
been previously experienced, then the thermostat bulb
may be coated with scalant and unable to sense water
temperature in the boiler accurately, and therefore unable
to control the contactors.

1. Replace contactors.

2. Unscrew operating thermostat bulb, clean off scal­ants and screw thermostat bulb back in.

This problem is an indication of inadequate water quality
and is not covered under warranty. Have water quality
analysed and corrected immediately to avoid complete
malfunction of the steamer.

UNIT SHUTS DOWN WHILE IN OPERATION

Pressure switch has been activated due to 5 PSI (35 kg/
cm2) pressure in the generator tank. Pressure in the
generator tank is caused due to plugged steam jet tubes
or steam diverters due to scale or poor water conditions.
Steam jet tubes/steam diverter will have to be cleaned or
replaced.

WIRING DIAGRAMS