User Guide

8
2.3 CONNECTING THE DRAIN (HRV130FL ONLY)
A drain tubing (included) must be installed on these units.
CAUTION
• Make a water trap loop in the tube to prevent the unit from drawing unpleasant odors from the drain source. Run the tube to the floor
drain or to an alternate drain pipe or pail.
• IMPORTANT: If using a pail to collect water, place the tube end approximately 1” inside the pail in order to prevent water from being
drawn back up into the unit.
• Fully insert a drain plug (included in parts bag) in alternate drain fitting located on top of the unit.
VO0243A
± 1"
8" MIN.
8" MAX.
VD0428
INSERT ALL THE WAY IN
2.2.4 MEASURING THE PRESSURE INSIDE THE DUCTWORK
After connecting the ductwork as instructed in sections 2.2.2 and 2.2.3, you must make sure that the
pressure in the return duct of the furnace/AHU allows the unit to operate properly.
1. Turn the unit OFF.
2. Turn the furnace/AHU ON at the highest speed.
3. Prepare to measure the pressure:
• Seal all the ductwork with tape. Close all windows and doors.
• Turn off all exhaust devices such as a range hood, dryer and bathroom fan.
• Make sure the unit’s integrated balancing dampers are fully open.
• Make sure all the filters are clean.
4. Place a magnehelic gauge on a level surface and adjust it to zero.
5. Connect tubing from the gauge to the fresh air to the house pressure tap. If the pressure is below 0.25 in. w.g., and the fresh air
distribution duct connection is least 10 feet* away from the furnace/AHU, no action has to be taken. If the pressure exceeds
0.25 in. w.g., or if the fresh air distribution duct cannot be connected at least 10 feet* away from the furnace/AHU, perform
the following step.
* This 10-ft. distance applies only in areas where the outside temperature falls below the freezing point (32°F).
6. Install a metal T coupling at the junction of the fresh air to the house duct
and the furnace/AHU return duct (shaded part in illustration).
If you have to perform the following step, the furnace/AHU blower
must be synchronized with the unit for all types of installations.
See Section 3.3.
CAUTION
This procedure applies to installations where the ductwork of the unit is connected to the return duct of the
furnace/AHU (sections 2.2.2 and 2.2.3). Failure to perform this step may severely decrease the performance of
the ventilation system and damage the unit and the furnace.
CAUTION
In presence of a combustion furnace in a closed room, an
additional duct must be connected to the T metal coupling to
allow air intake from outside this room (dotted line).
WARNING
!
VJ0140
VJ0139
MAX. 0.25 IN. W.G.