
5 SM-PS-100
based on water temperature. The switch will be closed if water temperature is
below 115°F +/- 5°F and will automatically reset at 104°F +/- 5°F. Unplug 14
pin connector and check sockets 7 and 8 for a short against ground. The snap
disc should read less than 1 ohm when closed. Replace if open when water
temperature is under 115°F. The sensor is located in the sensor pad on the rear of
the unit sink see the disassembly section for details on how to remove.
MOTOR THERMOSTAT (MTR-TSAT)
The Motor Thermodisc is a protection device only the motor. If the temperature
of the motor reaches 180°F, the disc opens, cutting off power to the contactors,
and power to the motor. Check for a short to ground between the 2 brown quick
connect wires. If open and the motor is not hot motor will need to be replaced as
the thermodisc cannot be replaced.
TRANSFORMER
The Transformer reduces the incoming power supply voltage to 24 volts. The
transformer source power should match the units serial tag. Per the wiring
diagram one leg should be placed into the COM tab the correct voltage will
need to be selected between the 208 and 240 volt models. The 480 volt model
transformer will have a single tab labeled as “480”. The output voltage can be
checked at the 3 amp fuse it should read between 20-28V.
On single phase heated models the 208/240V to 24V transformer comes with a
4 amp resetable internal breaker. If this breaker trips and the 3 Amp inline fuse is
not open there is an internal fault with the transformer. If the 3 amp fuse is open
there is a defective component or a short in the 24V circuit, check all connections.
HEATER ELEMENT
The heater in a Power Soak sink is rated at 7000 watts. It includes 3 individual
2333 watt heater elements.
To check operations of the heat element, first turn the power off at the breaker.
Disconnect wires from the Heater contactor, check each heater lead to ground for
short. If no short is found refer to the list below to check the heater for internal
faults.
Heater Resistance Chart
Connection Heater Rated Voltage Phase Resistance
(ohms)
T1-T2
208
16.2
T1-T3
312.4
T1-T2
T3-T2
SINGLE ELEMENT ~18.5
T1-T2
240
18.2
T1-T3
316.8T1-T2
T3-T2
SINGLE ELEMENT ~24.7
T1-T3
380 341.2
T1-T2
T3-T2
SINGLE ELEMENT ~61.9
T1-T3
480 365.8
T1-T2
T3-T2
SINGLE ELEMENT ~98.8
The heater should be within a 10% variance of the value of the chart.
If the reading varies significantly from the chart above, the heater may be defective,
or there may be a broken wire or loose connection. Electrically, the Heater is three
separate elements, each of 2333 watts. When replacing, note how the existing
Heater is wired, and refer to the schematic when wiring a new heater.
SAFETY CONTACTOR & HEATER CONTACTOR (WASH TANK HEAT MODELS
ONLY)
The Safety contactor feeds the pump motor contactor and the Heater contactor
with the source high voltage. It contains a 24V coil that pulls in once the start
button is depressed. The only condition where the safety contactor will not pull in
is when water temperature is above 135°F the high limit snap disc has failed or
the pump motor thermostat has tripped.
The Heater contactor has a 24V coil that only pulls in when the start button is
depressed and the water temperature is below 115°F. The heater contactor coil
is connected to the operational temperature snap disc to regulate the wash tank
temperature from 104°F-115°F +/-5°F. The heater contactor is connected to the
heater element based on the supplied wiring diagram.
To check the heater and safety contactors do the following:
TURN POWER OFF AT BREAKER PANEL.
Unplug all connections manually depress the coil, check for continuity across L1
to T1, L2 to T2, and L3 to T3 if no continuity is present the contactor is defective. If
the contactor presents continuity plug in all connections and proceed. Fill the wash
tank to fill line, Press the green start button and examine the following:
Use a multimeter to check coil terminals A1 and A2 for 20-28V across the coil. If
voltage is recorded, and the contactor is not pulling in, the contactor is defective
replace as necessary.
If no coil voltage is read on a multimeter check Thermal snap disc’s for proper
function.
PUSH ON / PUSH OFF START AND STOP BUTTONS
TURN POWER OFF AT BREAKER PANEL.
The start and stop buttons are connected to the 24V circuits that switches all
components on. The start and stop buttons can be checked as follows:
The stop button should have continuity at rest and no continuity when pushed in.
The start button should have no continuity at rest and continuity when pushed in.
Remove the wires before checking for continuity, if either switch does not have the
proper continuity replace the button.
LIQUID LEVEL CONTROL AND SENSOR
The liquid level control sends a trickle current (1/1000 amp) out terminal LCO
to the liquid level sensor. If there is water in the wash sink, the current passes
through it to the wash sink wall and back to the liquid level sensor to terminal GND.
After the circuit is complete, the relay in the liquid level control will close sending
current to operate the various components in the control panel. If the red indicator
light is “on” the liquid level control senses water. A 10 second time delay is timed
after the control has not sensed water. The purpose of this delay is to prevent rapid
cycling of the relay should the water rise and fall below the sensor while the sink
is filling or running. At the end of the time delay, the relay in the liquid level control
will open to stop the pump.
The sensor that is located on the top of the sink is the only sensor used. Check the
rear of the sensor to ensure proper connection of the white and green wire.
HEATER HIGH LIMIT THERMAL SNAP DISC / 130°F
The Heater Thermodisc is a protection device. The Hi-limit Bi-metallic snap disc
switch for water temperature (switch must be closed if water temperature is below
130°F +/- 5°F). Entire unit will not function until water is drained and colder water
is introduced. Unplug 14 pin connector and check sockets 9 and 10 for a short to
ground. The snap disc should read less than 1 ohm when closed. Replace if open
with water temperature under 130°F. The sensor is located in the sensor pad on
the rear of the unit sink see sensor pad on how to remove.
HEATER OPERATING THERMAL SNAP DISC / 115°F
The operating Thermal snap disk controls the on/off cycle of the sinks heater