Honeywell CPRD8, CPRD10, CPRD12, CPRD14 Specification Sheet

TrueZONE® Bypass (CPRD)

M34207

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

Dérivation TrueZONE® (CPRD)

MF34207

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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