Unified Brands VENTILATION SYSTEMS - Manual (Page 16)

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started and stopped manually or programmed
or automatic operation.
a. Fan Start
The exhaust and air make-up fans can be
started manually by pressing "FAN ON/WASH
OFF" on the PAWS panel. If the wash cycle is
in progress it will stop immediately and the fans
will start. The PAWS display will indicate "FAN
ON/WASH OFF".
b. Fan Stop
The exhaust and air make-up fans can be
stopped manually by pressing "FAN
OFF/WASH OFF" on the PAWS panel. The
fans will stop immediately. The PAWS display
will indicate "FAN OFF/WASH OFF".
c. Wash Start
The wash cycle can be started manually by
pressing "FAN OFF/WASH ON'' on the PAWS
panel. If the fans are on, they will stop
immediately. The display will indicate "WASH
1" and the total time [in hours and minutes]
remaining until the wash cycle ends.
d. Wash Stop
The wash cycle can be stopped manually by
pressing "FAN OFF/WASH OFF" on the PAWS
panel. The wash cycle will stop immediately.
The PAWS display will read "FAN OFF/WASH
OFF".
2. Trouble Conditions
a. Low Detergent Indicator
If the detergent level drops below the bottom of
the detergent probe, the PAWS panel horn will
sound and the display will flash "DETERGENT
LOW". The horn can be silenced by pressing
the "VFC Horn Silence" switch, but the trouble
condition will continue to be displayed. The
detergent pump will not operate until the
detergent tank is refilled. The fan and wash
cycles will continue to operate normally,
however, the display will continue to flash
"LOW DETERGENT". When the detergent
tank is refilled, the trouble condition will
automatically clear itself after approximately 10
seconds.
b. Supervised Water Valve [optional]
If your PAWS panel is equipped with the
optional supervised valve, the PAWS panel
horn will sound and the display will flash
"PLENUM WASH AND FIRE CYCLES LOST"
when the valve is closed. The horn can be
silenced by pressing the "VFC Horn Silence"
switch, but the trouble condition will continue to
be displayed. The fan will operate normally,
hot water will not flow during the wash cycle
and the display will continue to flash "PLENUM
WASH AND FIRE CYCLES LOST". When the
valve is opened, the alarm condition will
automatically clear itself. In the event that the
detergent level drops below the probe and the
optional supervised valve is closed at the same
time, the horn will sound and the display will
alternate between "DETERGENT LOW" and
"PLENUM WASH AND FIRE CYCLES LOST".
The horn can be silenced by pressing the "VFC
Horn Silence " switch.
3. Hood Plenum Fire Protection
a. Automatic Operation
In the event of a fire in and/or under the
ventilator, the fans will turn off and the plenum
wash will be activated when the temperature at
the duct collar exceeds 300°F. The display will
read "AUTO FIRE CYCLE FAN OFF/WASH
ON" and the PAWS panel alarm will sound.
The alarm cannot be silenced. When the
temperature at the duct collar drops below 300
°F, the PAWS panel will enter the fire delay
cycle. During the fire delay cycle the fan will
remain off and the hood plenum wash will
remain on for a programmable period of time
then automatically return to normal operation.
The fire delay cycle can be terminated by
pressing "FAN OFF/WASH OFF" on the PAWS
panel. [See Sec. 4.b.2.c for setting Fire Delay
Cycle Duration].
b. Manual Operation
The PAWS panel may be equipped with the
optional "Manual Fire Switch". Pulling the
"Manual Fire Switch" will turn on the exhaust
fan(s) and activate the plenum hood wash to
act as a fire barrier. The display will read
"MAN'L FIRE CYCLE FAN ON/WASH ON" and
the PAWS panel alarm will sound. The alarm
cannot be silenced. After the "Manual Fire
Switch" is reset, the PAWS panel will enter the
fire delay cycle. During the fire delay cycle the
exhaust fan will remain on for a programmable
period of time then automatically return to
normal operation. The fire delay cycle can be
terminated by pressing "FAN OFF/WASH OFF"
on the PAWS panel. [See Sec. 4.3 for setting
Fire Delay Cycle duration].
4. Programming Instructions [Refer to fig. 17A
& 17B]
a. Setting the Clock