Titus Pneumatic Controls IOM - Manual (Page 4)

PNEU-IOM-4.0 5-2-05
Calibration Procedure for TITUS II Controller
A. Direct Acting Cooling or Reverse
Acting Heating.
1. Adjusting minimum air flow:
a.
Apply zero PSI signal to Port T
on the controller.
b. If the minimum CFM equals
zero, the damper should drive
to a closed position with
compressed air (observe the
indicator on the end of the
damper shaft). If not, adjust the
LO knob on the controller until
the damper is closed.
c. If a non-zero minimum CFM is
required, read the differential
pressure for the desired CFM
from the calibration curve
corresponding to the inlet size
of the terminal being calibrated
(Page 8).
d. Adjust the LO knob until the
desired differential pressure is
read on the manometer gauge.
Allow several seconds for the
controls to react to the system
pressure and stabilize.
Note: Air flow must be going
across the inlet probe.
2. Adjusting maximum air flow:
a.
Apply 15-25 PSI signal to
Port T on the controller.
b. Refer again to the calibration
curve (Page 8) to determine
the differential pressure
necessary for the required
CFM.
c. Adjust the HI knob on the
controller until the manometer
gauge reads the required
differential pressure from the
curve.
NOTE: If actuator fails to respond,
see Guide to Service Procedures.
B. Reverse Acting Cooling and
Direct Acting Heating.
1. Adjusting minimum air flow:
a.
Apply 15-25 PSI signal to
Port T on the controller.
b. If the minimum CFM equals
zero, the damper should
assume a closed position
(observe the indicator on the
end of the damper shaft). If
not, adjust LO knob on the
controller until the damper
closes.
c. If a non-zero minimum CFM is
required, read the differential
pressure for the desired CFM
from the calibration curve
corresponding to the inlet size
of the terminal being calibrated
(Page 8).
d. Adjust the LO knob until the
desired differential pressure is
read on the manometer gauge.
Allow controls to react to the
system and stabilize.
2. Adjusting maximum air flow:
a.
Apply zero signal to Port T on
the controller.
b. Refer again to the calibration
curve (Page 8) to determine the
differential pressure necessary
for
the required
maximum CFM.
c. Adjust the HI knob on the
controller until the manometer
gauge reads the required
differential pressure from the
curve.
NOTE: If actuator fails to respond,
see Guide to Service Procedures.
H L
(0-15 PSI)
ROOM THERMOSTAT
ACTUATOR
MAIN AIR (20-25 PSI)
YELLOW
WHITE
BLUE
T
M
B
START
POINT
THERMOSTAT
CONTROLLER
COLD AIR
HOT AIR
DA
DA
RA
RA
LO
SENSOR
HI
GREEN
NC
NO
DAMPER
RESET
LO
HI
INCR
RED
Figure 6. Titus II Controller