Titus Pneumatic Controls for Dual Duct Terminals IOM - Manual

Installation Manual
PNEU-DD-IOM-1.0 8-9-02
Dual Duct Models with TITUS II and IIA Pneumatic Controls
Installation, Operation, and Maintenance Manual
Adjusting Minimum and Maximum Air Flow for Units with Two Inlet Sensors
A. Maximum Flow Adjustment for
Direct Acting Thermostat
1. Be sure the minimum LO air flow
limit is zero on hot and cold deck
controller.
2. To adjust the 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
m a n o m e t e r g a u g e a c r o s s
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 r equired
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, 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 sec onds
for the controls to react and the
system to stabilize. Rotate the
knob 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.
3. To adjust the hot deck maximum
CFM:
a. Apply 0 PSI to the thermostat
c o n n e c t i o n o n t h e c o l d d e c k
controller. That is, leave it open to
the atmosphere.Place a manometer
gauge across balancing tees at the
cold deck inlet.
b. Repeat Steps B, C and D above.
B. Maximum Flow Adjustment for
Reverse Acting Thermostat
1. To adjust the cold deck maximum
CFM:
a. Apply 0 PSI to the thermostat
connection on the cold deck
controller. That is, leave it open
to the atmosphere. Place a
m a n o m e t e r g a u g e a c r o s s
balancing tees at the cold deck
inlet.
b. Re p e a t s t e p s B , C a n d D
above.
2. To adjust the hot 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
hot deck. Place the manometer
gauge across balancing tees at
the hot deck inlet.
b. Re p e a t s t e p s B , C a n d D
above.
C. Minimum Flow Adjustment for
Either Thermostat
1. Place a 0-30 PSI pressure gauge in
the line between the TITUS I I
Controller and the damper actuator
on the cold deck.
2. Place a manometer gauge across
the balancing tees on the hot deck
inlet.
3. Adjust the thermostat pressure
( P r e s s u r e r e d u c i n g v a l v e
recommended) until the cold deck
damper just closes:
a. If the damper in the cold deck
is normally open, the pressure
g a u g e s h o u l d r e a d
approximately 10 PSI with
standard 5-10 PSI actuator.
b. If the damper in the cold deck
i s n o r m a l l y c l o s e d , t h e
pressure gauge should read
a p p r o xi m a t e l y 5 P S I wi t h
standard 5-10 PSI actuator.
4. Refer to Page 6 an d 7 f o r t h e
differential pressure corresponding
to the desired minimum air flow
(CFM).
5. Adjust the reset start point dial on
the hot deck until the manometer
gauge across the balancing tees
on the hot deck reads the desired
differential pressure.
D. After Flow Rates are Adjusted
1. Replace the thermostat connection
at the controller, if it has been
removed during the adjustment
process.
2. Remove the m anometer gauge and
replace the caps on the tees in the
HI and LO tubes.
NOTE: The controller w ill not operate
if these caps are left off.
3. Return the adjustment tool to its
socket in the face of the controller.
4. R e p l a c e t h e c o v e r s o v e r t h e
controllers.
B
Cold
TSTAT
MAIN M
T
Hi Lo
B
Hot
Hi Lo
M
T
Figure 1. Piping Diagram Figure 2. Control Box Label
MODEL NO. PEDV SIZE: 6
MAX CFM: 400 MIN CFM: 0
COLD INLET CFM: 400 VP: 0.63
HOT INLET CFM: 400 VP: 0.63
HAND (COLD INLET LOCATION):RH
LOCATION:
XXXX
FACTORY NO. XXXX ITEM: XXXX
MOTOR: XXXX
THST: DIRECT ACTING
Inlet Size, Inches
Minimum CFM
Cold Deck Max Velocity Pressure, Inches WG
Hot Deck Max Velocity Pressure, Inches WG
Same as Number as on Packing List
Actuator Mfr.
Thermostat Action