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308219
Installation
2.
Component Description
(continued)
Thermometer gauges
Each heater has an independent thermometer (204).
Because of the effect on the surrounding metal
exposed to the air, the thermometer usually reads far
below the selected fluid temperature during no-flow
conditions. The thermometer reading is only valid
when fluid is flowing.
Fluid filter
A fluid filter (112) at the outlet of each heater removes
particles from the foam chemicals that could clog the
spray nozzle or distort the spray pattern. Refer to the
separate instruction manual, 307273, for maintenance
instructions.
Junction box
Electrical power to the Foam-Cat Heater is wired
directly to the junction box (233), which supplies power
to the heater and heated hose controls.
The optional
Ambient Temperature Compensator
senses change in ambient temperature and increases
or decreases the amount of heat produced by the
heater or heated hose tape. The fluid is heated higher
on cold days than on hot days. The part number for
this accessory is 218564. See page 34 to install it.
How to use the
OPTIONAL
Ambient Temperature Compensator
(ATC)
Most fluid heaters produce, or output, just the amount
of heat selected on its TEMP SET dial, regardless of
ambient temperature changes during the day. So, in
order to maintain good foam development in outdoor
foam applications, the operator must continually adjust
the fluid temperature as ambient temperature changes.
The optional Foam-Cat Heater ATC feature automati-
cally checks and adjusts the fluid temperature. The
ATC Sensor (E–Fig. 1) which is designed to have no
effect
on heater output at 80
_
F (27
_
C), senses
ambient temperature above or below 80
_
F (27
_
C) and
automatically raises or lowers the heater output.
With the Heater TEMP SET at 115
_
F (46
_
C), and at
an ambient temperature of 60
_
F (16
_
C), the heater
output automatically rises to 125
_
F (52
_
C). As the
ambient temperature rises to 80
_
F (27
_
C), no
compensation is needed and the fluid is heated to just
115
_
F (46
_
C). As the ambient temperature rises to
100
_
F (38
_
C), the heater output is automatically
lowered to 108
_
F (42
_
C).
Keep in mind these points when using the ATC:
1.
An ATC is needed only when the ambient temper-
ature varies more than 20
_
above or below 80
_
F
(27
_
C).
2.
At an ambient temperature of about 80
_
F (27
_
C),
the heater heats the fluid only to the selected
temperature.
Fig. 3
01294
233
112
204
Summary of Contents for FOAM-CAT 200 Series
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