Rigging and Lifting the Unit
Unit shall be lifted by cables attached to all the lifting
points provided on the unit base. When lifting the unit
use spreader bars and cables to prevent damage to the
unit casing. Provide additional blocking and coverings
(as required) to prevent damage to the unit finish and/or
components. The spreader bars will help to maintain a
certain distance between the cables and the unit. Venmar
CES will not be responsible for any damage caused to
the unit casing during the lifting process. The lifting point
must be at the center of gravity to ensure that the unit is
level during hoisting and prior to setting. When commenc-
ing to hoist, take up the slack in the hoisting cables slowly
and gradually increase the cable tension until the full unit
weight is suspended. Avoid sudden, jerking movements.
Do not permit the unit to be suspended by the lifting lugs
for an extended period of time. Lifting holes are provided
in the base rails as shown in
tal documents for overall unit dimensions and
for unit weights.
Exhaust Dampers
Exhaust dampers are optional, but must be included with
the recirculation defrost option when selected in Venmar
Select™ Web Edition. A gravity backdraft damper or mo-
torized damper is available as an option for the exhaust
discharge.
On indoor units, exhaust dampers are shipped loose
with the units for field installation. On outdoor units with
end exhaust air discharge (complete with hood) or side
exhaust air discharge (complete with hood), the exhaust
dampers are factory mounted inside the hoods and
shipped loose with the units for field installation. If outdoor
units have exhaust air discharge (ducted) and include
an exhaust damper, it will be included with the unit and
shipped loose for field installation. See Table 1 for exhaust
damper dimensions.
The gravity backdraft dampers are for horizontal airflow
installations only, are non-insulated, for installed in duct
installation and are ¼” [6 mm] smaller ‘outside of frame’
than the duct size listed.
The motorized dampers are for flanged to duct installation
and are the same size as the duct size listed ‘inside of the
damper frame’. The damper frame is 2” [51 mm] larger
outside than the dimensions listed, is non-insulated with
the damper actuator mounted outside of the frame on the
drive pin and with the linkage mounted outside the frame
on the opposite side. There is no specific air entering or
leaving side. Access to both sides of the damper frame
must be provided.
The damper should be mounted sufficiently far enough
downstream from the exhaust fan discharge to avoid
system effect added pressure losses. A straight length
of duct same size as the unit exhaust discharge and
length as indicated in
fol-
lowed by a gradual transition to ‘duct size’ for damper is
recommended.
Motorized dampers are available with insulated or non-
insulated opposed blades; damper actuators are 24 VAC,
available in power open/spring return, power open/power
closed or modulating designs. See submittals for the type
of damper and actuator supplied.
A 24V wiring harness is factory provided on the actuator
and a matching wiring harness with spade connectors is
factory provided on the unit when ordered with the unit for
field connection. Length of wiring harness is approximately
48” [1,219 mm] total. Any additional length required must
be field provided.
IMPORTANT
The hoods for these units are not installed from the
factory and must be installed on site. They should be
installed after the unit is installed. Hoods are shipped
on top of the unit. When rigging the unit, make sure
the hoods are secured and are not damaged by the
spreader bars. See
for hood installation.
CAUTION
All panels must be in place when rigging.
Table 1: VHC-36, -42 and -50 Exhaust Dampers Duct
Dimensions
Model
Duct Size (H x W) Damper Type
VHC-36
18” x 18”
[457.2 x 457.2 mm]
Backdraft (pressure open/
gravity closed)
Motorized
VHC-42
21” x 21”
[538.4 x 538.4 mm]
Backdraft (pressure open/
gravity closed)
Motorized
VHC-50
26” x 26”
[660.4 x 660.4 mm]
Backdraft (pressure open/
gravity closed)
Motorized
VCES-VHC-IOM-1F – VHC-36, -42 & -50
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