6
Stale Air Exhaust System
The stale air exhaust system is accomplished by the posi-
tive pressure created in the furnace ducting.
The air
handler blower must be running for this system to be
effective.
Drain Connection (HRV Only)
During a defrost cycle, the HRV may produce some con-
densation. This water should flow into a nearby drain, or
be taken away by a condensate pump.
The HRV cabinet has prepunched holes for the drain (see
below). Insert the drain spout through the hole in the drain
pan. Do not forget the “O ring” which seals each spout to
the pan.
REMEMBER TO HAND TIGHTEN ONLY
the
washer and lock nut which hold the drain spout in place.
Construct a P-Trap using the plastic tee connector. Cut
two lengths of hose and connect each piece to an end of
the “T” fitting, then connect the other ends to the two drain
spouts. Position the "T" fitting to point upward, andconnect
the drain line. Tape or fasten base to avoid any kinks. This
creates a “trap” which will hold some condensate and pre-
vent odours from being drawn up the hose and into the
fresh air supply of the HRV.
DRAIN
SPOUT
ZIP TIE
TO DRAIN
TEE
CONNECTOR
DRAIN
SPOUT
PRE-PUNCHED HOLES (2)
DRAIN PAN
DRAIN PAN
1/2 " I.D.
DRAIN HOSE
DRAIN HOSE PLUMBING
DRAIN
SPOUT
DRAIN
SPOUT
TO DRAIN
1/2" HARD PIPE
TEE
JOINT
PRE-PUNCHED HOLES (2)
DRAIN PAN
DRAIN PAN
HARD PIPE PLUMBING
"P" Trap (HRV only)
Note: Secondary drain pan may be required to
protect from condensate leakage.
The HRV and all condensate lines must be
installed in a space where the temperature is
maintained above the freezing point.
CAUTION
Air Duct Design and Installation
A well designed and installed ducting system will allow the
HRV to operate at its maximum efficiency.
Always try to keep duct runs as short and straight as pos-
sible. See Installation Diagrams for various installation
options.
The inner and outer liners of the flexible insulated duct
must be clamped to the sleeve of the weather hoods (as
close to the outside as possible) and the appropriate port
on the HRV. It is very important that the fresh air intake
line be given special attention to make sure it is well
sealed. A good bead of high quality caulking (preferably
silicone sealant) will seal the inner flexible duct to both the
HRV port and the weather hood prior to clamping with a
large zip tie.
To minimize air flow restriction, the flexible insulated duct
that connects the two outside weather hoods to the HRV
should be stretched tightly and be as short as possible.
Twisting or folding the duct will severely restrict air flow.
See below for the recommended connection of flexible
insulated ducts to the the outside weather hoods and the
HRV.
Include a short length of fabric flex duct or other
non-metallic connector in this hard ducted line
in order to keep the HRV separately grounded
(electrically) from the air handler. This will avoid
a possible shock hazard to service people if a
short to ground develops in one of the devices.
WARNING
