TrueZONE® Bypass (CPRD)
M34207
D
E
B
C
A
Regulator
Damper
INSTALLATION INSTRUCTIONS
APPLICATION
The TrueZONE® Bypass constant pressure regulating damper
(CPRD) is a round static pressure relief damper. It is used in
forced-air bypass applications to relieve excess static
pressure when some of the zone dampers are closed. The
damper is installed in a duct that delivers air to the return or a
dump zone. The damper automatically opens and closes to
maintain a desired static pressure.
The CPRD uses a calibrated spring to regulate the bypass air
accurately when any number or combination of zones is
calling. Conventional, weighted arm, bypass dampers may
operate properly when one zone is calling; however, when
different combinations of zones are calling, they bypass too
much or too little. This can cause callbacks when
homeowners complain of air noise.
Selecting the Correct CPRD
1. Size the bypass damper by subtracting the cfm of the
smallest zone from the cfm of the system.
2. Consult Table 1 to determine the CPRD to use.
3. Example:
Bypass CFM = Total System CFM - Smallest Zone CFM
DIMENSIONS
SPECIFICATIONS
Construction:
Galvanized steel, see Table 2
Temperature Range:
Ambient: 0F–165F (-17C–73C)
Storage: 30F–150F (-1C– 65C)
Table 1. Damper Sizing
Bypass
Damper
CPRD8 CPR8 600 CFM
CPRD10 CPR10 1000 CFM
CPRD12 CPR12 1400 CFM
CPRD14 CPR14 1700 CFM
Replacement
Regulator Maximum Airflow
Table 2. CPRD Dimensions.
ABCDE
Model
CPRD8 8 203.2 9.65 245 1.50 38 11.54 292.84 4.65 118 26
CPRD10 10 254 11.42 290 1.50 38 13.50 343 4.65 118 26
CPRD12 12 305 13.18 235 1.50 38 15.47 392.84 4.65 118 24
CPRD14 14 355 14.96 380 1.50 38 17.36 441 4.65 118 22
Gaugein mm in mm in mm in mm in mm
69-2770EFS-03
TRUEZONE® BYPASS (CPRD)
INSTALLATION
Select Damper Location
Install the CPRD onto a starting collar or in duct that loops
from supply to return. The supply side take-off must be before
any zone dampers. It is best to install the return side of this
loop as far a practical from the air handler.
The CPRD can be mounted in vertical or horizontal ductwork,
or at any angle. The damper may also be rotated to be
installed with the regulator on either side, top or at any angle
between.
Secure the damper to sheet metal ductwork with screws or to
flex-duct with tape. If ducting with flex-duct, the outer layer of
plastic can be taped to the damper mounting flange to fully
insulate the damper.
Alternatively, the CPRD can dump air from the supply to a
non-critical temperature area such as a hallway, basement, or
false ceiling.
Attach Regulator to Damper
1. Align the regulator with the "D" shaft on the damper (see
Fig. 1).
2. Slide the regulator onto the "D" shaft and push down
while turning counterclockwise until it snaps into place
(see Fig. 2).
Fig. 1.
M34208
M34209
Fig. 2.
Setting the Regulator
The CPRD is factory set to open at approximately .5"WC."
This setting is satisfactory for most installations. Some
systems have higher static pressure.Test this by:
1. Make all zones call fan, heat, or cool; whichever has the
highest CFM.
2. Verify that the damper position indicator points to
closed.
3. If it does not point to closed:
• Flip the adjustment crank out (see Fig. 3)
• Push down on the adjustment crank with gentle
pressure. Caution: Do not rotate the adjustment
crank without first pushing it down
• Turn the adjustment crank clockwise until the
indicator points to closed
• When done, flip the adjustment crank back into the
locked position
4. Make only the smallest zone call for fan, heat, or cool.
5. Verify that the airflow into that zone is not objectionable.
If it is, then set the regulator to a lower pressure.
Removing the Regulator
If you need to remove the regulator from the damper, do so by
pressing the red release button. See Fig. 4. It is easier to
remove the regulator after turning the pressure down to a
lower setting.
PRESSURE SETTING
INDICATOR
RELEASE
BUTTON (RED)
Fig. 4. CPRD regulator
Fig. 3.
DAMPER POSITION
INDICATOR
M34211
M34210
ADJUSTMENT
CRANK
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
® U.S. Registered Trademark
© 2012 Honeywell International Inc.
69-2770EFS—03 M.S. Rev. 12-12
Printed in United States
Dérivation TrueZONE® (CPRD)
MF34207
D
E
B
C
A
Régulateur
Registre
NOTICE D’INSTALLATION
APPLICATION
Le registre de régulation de pression constante (CPRD) de
dérivation TrueZONE
rond. Il est utilisé dans les applications de dérivation à air
pulsé pour limiter la pression statique en excès lorsque
certains registres de zone sont fermés. Le registre s'installe
dans une gaine fournissant de l'air à la zone de retour ou
d'évacuation. Le registre s'ouvre et se ferme automatiquement
pour maintenir la pression statique désirée.
Le CPRD utilise un ressort étalonné pour réguler avec
précision l'air de dérivation en cas d'appel de diverses zones
ou combinaisons de zones. Les registres de dérivation à bras
lesté conventionnels peuvent fonctionner adéquatement en
cas d'appel d'une seule zone; toutefois, lorsque diverses
combinaisons de zones lancent un appel, la dérivation est
insuffisante ou excessive. Ceci peut causer des retours de
produits lorsque les propriétaires se plaignent du bruit causé
par l'air.
®
est un registre de pression statique
Sélection du CPRD correct
1. Dimensionner le registre de dérivation en soustrayant la
superficie de la zone la plus petite de la capacité du système.
2. Consulter le Tableau 1 pour déterminer le CPRD à
utiliser.
3. Exemple : Superficie dérivation = Capacité totale du
système - Superficie de la zone la plus petite
CARACTÉRISTIQUES
Construction : Acier galvanisé, voir le Tableau 2
Plage de température :
Ambiante : 0 °F-165 °F (-17 °C-73 °C)
Stockage : 30 °F-150 °F (-1 °C-65 °C)
Tableau 1. Dimensionnement du registre.
Registre de
dérivation
CPRD8 CPR8 600 CFM
CPRD10 CPR10 1000 CFM
CPRD12 CPR12 1200 CFM
CPRD14 CPR14 1400 CFM
Régulateur de
rechange
Débit d'air
maximum
DIMENSIONS
Tableau 2. Dimensions du CPRD
ABCDE
Modèle
CPRD8 8 203,2 9,65 245 1,50 38 11,54 292,84 4,65 118 26
CPRD10 10 254 11,42 290 1,50 38 13,50 343 4,65 118 26
CPRD12 12 305 13,18 235 1,50 38 15,47 392,84 4,65 118 24
CPRD14 14 355 14,96 380 1,50 38 17,36 441 4,65 118 22
Calibrepo mm po mm po mm po mm po mm
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