Honeywell Home TrueZONE Bypass Installation Instructions Manual

TrueZONE

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
Model in
CPRD8 8
CPRD10 10
CPRD12 12
CPRD14 14
®
Bypass (CPRD)
Regulator
E
Damper
Table 2. CPRD Dimensions.
A B
mm in mm
203.2 9.65 245 1.50
254 11.42 290 1.50
305 13.18 235 1.50
355 14.96 380 1.50
Installation INSTRUCTIONS

SPECIFICATIONS

Construction:
Galvanized steel, see Table 2
Temperature Range:
Ambient: 0–165 °F (-17–73 °C)
Storage: 30–150 °F (-1– 65 °C)
Table 1. Damper Sizing
Bypass Replacement
Damper
CPRD8 CPR8
CPRD10 CPR10
CPRD12 CPR12
CPRD14 CPR14
D
A
C D
in mm in mm
38 11.54 292.84 4.65
38 13.50 343
38 15.47 392.84 4.65
38 17.36 441
Regulator Maximum Airflow
600 CFM
1000 CFM
1400 CFM
1700 CFM
C
B
M34207
E
in mm Gauge
118 26
4.65 118 26
118 24
4.65 118 22
69-2770EFS-05