34
308219
Service
Hose Sensor Simulator, Optional ATC
WARNING
To reduce the risk of serious injury, including fluid
injection or electric shock:
1.
Follow the
Pressure Relief Proce-
dure
on page 6 before checking or
adjusting any part of the system or
any component and whenever you
are instructed to relieve pressure.
2.
Disconnect the main electrical power
to the heater before removing any
heater panels.
Hose Sensor Simulator Replacement
NOTE:
Use replacement part 218655.
1.
Relieve the pressure, and shut off the main power
to the heater.
2.
Check the resistance of the simulator (304) before
replacing it. See the procedure on page 23. That
procedure also tells you how to disconnect the
simulator leads.
3.
Loosen the cable clamp (312) screws and pull out
the simulator leads.
4.
Install the new simulator through the clamp. Be
sure that about 1/4 in. (7 mm) of insulation is cut
away from the lead ends. Using the procedure in
Setup,
page 20, insert the leads.
5.
Calibrate the hose sensor simulator.
CAUTION
Calibrate the simulator as instructed below before
continuing to reassemble the heater. Calibration
ensures proper temperature.
Hose Sensor Simulator Calibration
1.
A Graco heated hose (P/N 218613, 218614,
947514, 947515 and 948723) must be connected
to the heater.
2.
Turn on the electrical power, turn on the hose
circuit breaker, and set the temperature dial to
CAL
. Allow the heater to warm up.
3.
If adjusted properly, the light on the hose control
panel should be ON about 80% of the time and
OFF about 20% of the time for 15 to 20 minutes
and then start to decrease its ON time.
WARNING
ELECTRIC SHOCK HAZARD
To reduce the risk of electric shock, turn
off the main power to the heater before
adjusting the potentiometer.
4.
If a fluid sample is too cold after 30 minutes,
turn the potentiometer counterclockwise 2 turns
and recheck.
5.
If a fluid sample is too hot after 30 minutes,
turn the potentiometer clockwise 2 turns at a time
and recheck.
Installing the Optional ATC
(Ambient Temperature Compensator)
1.
Relieve the pressure, and shut off the main power
to the heater.
2.
Remove connector P1 from each circuit board.
See Fig. 23.
3.
Install the new ATC through the cable clamp (207)
of the main junction box (228). See page 38.
Insert two connectors (P1) of the ATC sensor
through the cable clamp (207) that holds the
junction box (228) to the heater control box (224).
Insert the third connector (P1) of the ATC sensor
through the cable clamp (207) that holds the
junction box (228) to the hose control box (309).
Connect one connector to each circuit board at
position J1 of the heater and hose controls.
4.
Tighten the cable clamp screws and reinstall the
control panel covers and junction box cover.
NOTE:
If your system does not include a hose control
box, one set of leads and its connector will not be
used. Tape these parts inside the box.
Содержание FOAM-CAT 200 Series
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