Titus Pneumatic Controls for Dual Duct Terminals IOM - Manual (Page 4)

M T
ACTUATOR
ACTUATOR
CONTROLLER
T
M
Hi B
LO
Cold
Hot
CONTROLLER
M
Lo
T
Hi
B
PNEU-DD-IOM-4.0 8-9-02
Adjusting Minimum and Maximum Air Flow for Units with Cold Inlet Sensor and Hot Discharge
Sensor
A. Direct Acting Thermostat Air
Flow Adjustment
1. Cold inlet controller. Be sure the
cold inlet damper assumes a fully
closed position during heating
conditions. Apply 0 PSI pressure to
the thermostat connection of the
cold inlet controller. If the cold inlet
damper does not fully close, adjust
LO air flow know until the damper
closes. Allow several seconds for
the controls to react to system
pressure and stabilize.
To adjust cold deck maximum CFM:
a. A p p l y 1 5 - 2 5 P S I t o t h e
thermostat connection on the
cold deck controller. Place a
manometer gauge across the
balancing tees at the cold deck
inlet.
b. I f t h e m a n o m e t e r g a u g e
reading matches the required
differential pressure from the
calibration curve (Page 6 and
7 ) , n o a d j u s t m e n t i s
necessary.
c. If adjustment is necessary, use
the adjusting tool stored in the
face of the controller (Titus II
only) or a standard flat-blade
screwdriver.
d. Rotate the maximum HI knob
slowly. A delay in response
time has been deliberately built
i n t o t h e c o n t r o l s t o a v o i d
hunting. Allow several seconds
from controls to react and the
system to stabilize. Rotate the
know until the gauge shows the
required differential pressure.
N O T E : I f t h e a c t u a t o r f a i l s t o
r e s p o n d , s e e G u i d e t o S e r v i c e
Procedures.
To adjust Min./Mix CFM on hot controller
/ discharge sensor:
a. Apply 8.0 PSI pressure to the
thermostat connection of the
cold deck controller.
b. If Min./Mix CFM equals zero.
The hot inlet damper should
assume a closed position. If
not, adjust minimum LO knob
on the hot inlet controller until
the damper closes.
c. If Min./Mix CFM is a non-zero
value, place a mano m e t e r
gauge across the balancing
tees of the hot deck inlet. If the
pressure matches the required
differential from the calibration
c u r v e ( P a g e 6 a n d 7 ) , n o
adjustment is necessary.
d. If adjustment is necessary,
rotate the minimum LO knob
until the gauge s h o ws t h e
required differential pressure.
To adjust hot deck maximum CFM:
a. Apply 0 PSI pressure to the
thermostat connection on the
hot deck controller. Place a
manometer gauge across the
balancing tees at the hot deck
inlet.
b. I f t h e m a n o m e t e r g a u g e
reading matches the required
differential from the calibration
c u r v e ( P a g e 6 a n d 7 ) , n o
adjustment is necessary.
c. If adjustment is necessary,
rotate the maximum HI knob
slowly. Rotate the knob until
the gauge reads the required
differential pressure from the
curve.
Figure 6. Constant Air Volume
Piping Diagram
Figure 7. Variable Air Volume
Piping Diagram
T
M Lo
Hi
Hot
Cold
Hi
M T
B
T M
CONTROLLER
ACTUATOR
CONTROLLER
LO
B