Cashco 764T Temperature Controller - Manual (Page 10)

IOM- 764T 10
d.
e.
f.
a.
b.
c.
d.
e.
f.
9.
Using channel locking pliers, tighten knurled
lock nut (16), to allow re mov al from the bath
without the hous ing-to-thermal bulb joint
chang ing with re spect to each other.
Place the thermal bulb into a vise and secure.
Wrench tighten knurled lock nut (16) without
al low ing the housing (1) to "move".
Re-insert the bulb (12) into the bath, and
rotate adjusting screw (2.3) CW or CCW a
few degrees to cause the calibration setpoint
to be repeated. If setpoint is in error, repeat
Sub-Steps a. through f. until correct.
FOR REVERSE ACTION:
Rotate adjusting screw (2.3) CW or CCW to
achieve desired set point. If set point cannot
be achieved, go to step b or c.
If the output pressure gage (11) is at 15 psig
(1.03 Barg) or more, increase the setpoint
tem per a ture by holding the thermal bulb (12)
locking pliers, and rotating housing (1) CCW
(viewed from front face) until the output pres-
sure de creas es to 9 psig (0.62 Barg).
If the output pressure gage (11) is at 0 psig
(0.0 Barg), decrease the setpoint tem per a ture
by hold ing the ther mal bulb (12) locking pliers,
and rotating hous ing (1)CW (viewed from front
face) until the output pressure in creas es to 9
psig (0.62 Barg).
Using channel locking pliers, tighten knurled
lock nut (16), to allow removal from the bath
without the housing-to-ther mal bulb joint
chang ing with re spect to each other.
Place the thermal bulb into a vise and secure.
Wrench-tighten knurled lock nut (16) without
al low ing the housing (1) to "move".
Re-insert the bulb (12) into the bath, and
rotate adjusting screw (2.3) CW or CCW a
few degrees to cause the calibration setpoint
to be re peat ed. If setpoint is in error, repeat
Sub-Steps a. through f. until cor rect.
Remove plug of Step 2, and tem po rary IAS of
Step 3.
8.2.
SECTION VII
VII. TROUBLE SHOOTING GUIDE
1. No controller response.
Possible Cause Remedy
A. Sensing thermal bulb loose at screwed A. See remedy 5.A this section. Re-calibrate.
connection to housing.
B. No air supply B1. Check to see if air is avail able at airset.
B2. Check to see if airset fi lter and/or drip-
well is plugged.
C. Improper action; port "A" or "B" C. Reference Tables 1 & 2 herein for de-
connections reversed. sired action and proper port; reverse
as required.
D. PB needle valve is fully closed. D. Open at least to alignment of match-
marks on valve's screw head and
housing.
E. Ice formation. E. Use dry air as an IAS medium in cold
weather. Thaw as necessary by use of
air heater. Trace as necessary.
F. Final element operation problem; F. Reference instructions for operation of
i.e. control valve, positioner, fi nal element.
solenoid, etc.
2. Improper control valve action.
Possible Causes Remedy
A. Mismatch of pneumatic hardware. A. Check bench set of actuator. Consider positioner
or booster.
B. Improper action; port "A" or "B" connections B. Reference Tables 1 and 2 herein for desired
are reversed. action and proper port; reverse as required.