6 UV-PRC001-EN
Face and Bypass
(Option)
The face and bypass option con-
sist of an actuator, damper blade
and 2-position water valve (op-
tion).
During face and bypass mode, the
damper swings to an upward posi-
tion, closing off any air travel
through the coil. The damper
blade is tightly sealed to eliminate
heat pickup while in the bypass
mode.
A two-position valve control op-
tion further enhances this system
by closing off all water flow to the
coil during the bypass position.
This provides a cost savings dur-
ing the bypass operation for both
2-pipe and 4-pipe hydronic sys-
tems. 2-pipe main steam systems
also utilize the face and bypass op-
tion with an isolation valve. By uti-
lizing the face and bypass option,
variable pumping is made possi-
ble. See Figure 7 for horizontal
unit with face and bypass.
Face and Bypass Actuator
(option)
The face and bypass damper actu-
ator incorporates a direct couple
design for both the horizontal and
the vertical configurations. See
Figures 8 and 9 for mounting
locations of the actuator.
The actuator is provided with elec-
tronic protection against overload.
It does not contain, nor require a
limit switch. When reaching the
damper end position, the actuator
automatically stops. The gears can
be manually disengaged with a
button on the actuator housing.
See Table 2 for technical data
of the face and bypass actua-
tor.
Table 2: Technical data for face &
bypass actuator
Power Supply
24 VAC ± 20% 50/60 HZ
24 VAC ± 10%
Power
Consumption
2 W
Tranformer
Sizing
3 VA (class 2-power source)
Angle of
Rotation
Maximum 95-degree
Adjustable with mechanical stop
Torque 35-inch/lb
Direction of
Rotation
Reversible with switch L/R
Position
Indication
Clip-on indicator
Run Time
(nominal)
90-second constant
Manual
Override
External push button
Noise Level Less than 35 dB
Control Signal 3-point floating
Features and
Benefits
Figure 7: Horizontal with face
and bypass
Figure 8: Actuator mounting
locations (vertical)
Figure 9: Actuator mounting
locations (horizontal)
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