© 1995-2009 Energy Saving Products Ltd.
Module OPT
Add-Ons & Third Party Options (2/2)
Module OPT Add-Ons & Third Party Options (2/2)
Fig. 02 – Fire Stopping Devices
For areas that require fresh air make-up, a small intake
may have to be installed. It is recommended to install
an insulated flex duct, with a damper, into the return air
plenum. The damper can then be adjusted to supply the
exact amount of fresh air needed to meet local building
codes
(Fig. 01)
. This should be balanced to the exhaust air
levels of the structure. Either filter the combined air stream
through a common filter or use separate filters for both air
streams.
Install the fresh air duct to the side of the return air and
not directly into the air stream. As shown in
Fig. 01
, the
fresh air duct should be installed more than 6’
(1.5m)
away
from the fan coil and before a 90º bend.
If too large of a duct is installed, the excess fresh air will
increase system operating costs and decrease system
performance.
Some areas require a Fire Stopping device to stop
the spread of a fire and/or prevent the duct system from
supplying oxygen to the fire. The Hi-Velocity System can
be used in conjunction with several types of Fire Stopping
devices such as pipe collars, wrap strips and mechanical
shut-offs.
With our Rough-In Boots,
Metacaulk pipe collars work very
well;
Fig. 02
gives an illustration of
a pipe collar used with the Rough-
In Boot. Many options are available
to the designer. If assistance is
needed in product choice, call our
representatives at Energy Saving
Products for free technical advice.
Fig. 03 – Humidifier
18”
When a bypass type
humidifier is used, the
humidifier can be mounted on
the return air duct, and then a
2”
(51mm)
take-off from the hot
air side is run back
(Fig. 03)
.
DO NOT use any size larger
than 2”
(51mm)
, and be sure to
install a summer shut-off, or it
will create problems with the
airflow.
Fresh Air Make-Up
Fire Stopping
Humidity Control
Third Party Options
Fig. 01 – Fresh Air Make up
Exterior
Intake
Insulated Fresh Air Intake
Adjustable
Damper
Install at least 6’ (1.8m) away from fancoil,
not directly into the air stream, to allow fresh
air to mix with the return air. A P-Trap of at
least 3’ (914mm) in depth should be installed
to stop the migration of air.
P-Trap
An approximate fresh air duct sizing is: 3”
(76mm)
for
the HE-50, 4”
(102mm)
for the HE-70, and 5”
(127mm)
for the
HE-100.
An HRV (Heat Recovery Ventilator) is typically a flat-plate
air-to-air heat exchanger that transfers temperature between
the two air streams. An ERV (Energy Recovery Ventilator)
will exchange water vapour as well as temperature. It is
usually a “heat wheel” and some amount of air will leak
between the two airstreams. It is generally more costly
than an HRV but it has the advantage of reducing the latent
capacity and not just the sensible capacity.
HRV/ERV
There are several ways to integrate these products
into the Hi-Velocity System. The easiest is to draw the
exhaust from the return duct and then to add the fresh air
immediately downstream.
However, the best method is to have a separate return
for the exhaust air. This will minimize any short circuiting
of air between the fresh air and the exhaust, optimizing the
location of the exhaust returns, which are best located in
bathrooms.
