Specifications

VCES-ERV-IOM-1A – ERV500i/e
6
In cold climates (−5°F [−20°C] design), the unit must be
mounted in a dry area (not exceeding 30% RH) to avoid
condensation on the exterior of the cabinet during winter
operation. Alternatively, accommodation must be made
for condensation on the cabinet exterior. Do not mount
units in an area where exposure to hot chimneys, electrical
panels or other hazards will occur.
A mounting location close to an exterior partition will min-
imize the length of insulated ductwork required. Exhaust
air to outside and inside air ducts must be insulated. Inlet
and exhaust hoods should be separated by a minimum of
10 feet [3,048 mm] to avoid outside cross contamination.
Ceiling Mount
The unit must be mounted level and may be hung with
threaded rod (field supplied) through the protruding frame
at the base of the unit. Hole centers are shown in the
overall dimensional drawings in Appendix B. Rubber or
seismic vibration isolation may be required in some regions
(field supplied and specified).
Surface Mount
The unit may be secured to a metal or wooden curb
fastened to the floor. If securing the unit to the curb
is required, fasteners and isolators may be used at the
mounting points on the frame protruding from the unit
(all mounting hardware is field supplied and specified).
Rooftop Mount (ERV500e Only)
Care must be exercised in locating the roofcurb for the
unit on the roof opening. The HVAC system should cross
enough roof supports to safely distribute the weight of the
system over the roof. For hole sizes of the units, see Ap-
pendix B. For more roofcurb information, see Appendix A.
Remove roofcurb from packaging. Assemble and install
accessory roofcurb in accordance with instructions shipped
with the curb. See Appendix A for curb dimensions. Install
cant strip, flashing and roof felt as per Appendix A.
Ductwork must be attached to the roofcurb, not the unit.
Consult with local authorities or your local building code
for minimal intake hood height from the roof to determine
the height of the roofcurb. See Appendix B for dimensions
of the unit.
Make Duct Connections
ERV500i
Port locations for the indoor unit are labeled in Figure B1.
An 18” [457 mm] long section of straight duct must be
used immediately after the supply fan to achieve optimal
fan performance. Transitions (field supplied) may be re-
quired to make connection with ductwork that is properly
sized for minimum noise and pressure loss. Both duct
connections to outside must be insulated to avoid conden-
sation and heat loss. A continuous integral vapor barrier
must be used over the duct insulation.
Airflow rate balancing dampers are recommended for
both supply and exhaust ducts to allow for adjustment of
airflows as shown in Figure D1. Flexible connectors should
be installed close to the unit in the duct leading to occu-
pied spaces to minimize noise transmission. All ports have
1” [25 mm] flanges to facilitate duct connection. Ensure
that fasteners used to make duct connection do not inter-
fere with fans or dampers in the unit.
Electric preheat, if used as frost control, must be installed
in the intake from outside at a minimum distance from the
unit port of 24” [610 mm].
ERV500e
On vertical discharge units, secure all ducts to the roofcurb
and building structure. Do not secure ductwork to the
unit. For duct size requirements, see Appendix B. Insulate
and weatherproof all external ductwork, joints and roof
openings with counter flashing and mastic in accordance
with applicable codes. Ductwork running through roof
decks must comply with local fire codes. Ducts passing
through unconditioned spaces must be insulated and cov-
ered with a vapor barrier. Flexible connectors should be
installed close to the unit in the duct leading to occupied
spaces to minimize noise transmission.
IMPORTANT
The gasketing of the unit to the roofcurb is critical for
a water-tight seal. Install gasket with the roofcurb as
shown in Appendix A. Improperly applied gasket can re-
sult in water leaks and poor unit performance.