Unified Brands VENTILATION SYSTEMS User Manual

Page 15

vac as long as the "START" Button is
depressed.

d.Once the "Start" Button is released,

power[120vac]

will

present at

terminals No. 2 & No. 6. If no power is
present after releasing start button
verify that the fan contactor has been
wired as shown on VCW Panel
Electrical Schematic.

e.Voltage present at terminals No. 2 &

No. 6 after pushing "START" Button,
fans won't operate.

This condition

indicates that the control wiring is
operating

properly,

therefore

the

problem must be in the fan motor itself
or the power supply wiring to fan thru
the normally open contactor or the fan
contactor.

b.Auto Wash Solenoid does not open.

1.Check that fuse is intact.

2.Check terminals No. 1 and No. 2 with volt

meter.
a.If 120vac proceed to step 2d.
b.If no voltage, check fuse and wiring to

panel.

c.Check panel circuit breaker and verify

that it is "ON",

d.Press "Stop" button in completely and

hold for one [1] full second.

e.Check terminals No. 3 and No. 4 with

volt meter.
i.If 120vac is present, check wiring to

water solenoid. Check voltage at
solenoid coil. If 120vac is present,
replace coil. If no voltage, refer to
step 2.b.

ii.Check the timer relay inside the VCW

Panel to verify that power is going thru
the contacts and that the coil is
engaging. If relay doesn't function
properly, replace the relay, If relay
functions properly proceed to step 4.

iii.Check wiring against schematic to

verify that is correct. Check condition
of wires and connections to verify that
they are not loose or damaged.

c. Auto Wash Solenoid will not close.

1.Check terminals No. 3 & No. 4 for voltage

[120vac]. If no voltage is present
proceed to step e.

2.Check the wiring to the fire switch pull

station to see that it has been wired to
the correct contacts.

3.Check

the

fire

switch

pull station

[optional] to verify it has not been pulled.

4.Check all the dampers on the ventilator to

verify that none of the dampers have
been activated into the fire condition.

5.Check condition of solenoid for damage

or debris.

d.Solenoid coil activates but no water flow is

present.

1.Check water pressure gauge. If water

pressure of 25 psig or more is present
proceed to steps 2 & 3. If no water
pressure is present proceed to steps 4 &
5.

2.Check solenoid valve for damage or

debris.

3.Check for water line blockage and verify

all spray nozzles are clear.

4.Check all water supply valves to verify

they are open.

5.Check and clean all line wye strainers.

B. PAWS Control Panel [Refer to fig. 17]

1. Manual Operation

The Programmable Automatic Wash Sequence
[PAWS] Panel is designed to control the
operation of the ventilator exhaust and air
make-up fans and wash the grease extraction
plenum with a hot water/detergent solution.
The fan operation and wash sequence can be