7
ELECTRICAL WIRING
These units may, or may not, have a factory supplied disconnect switch. If disconnect is field supplied, provide a disconnect per the NEC. Use copper conductors
only. All field wiring must comply with NEC and local requirements. In Canada, electrical connections must be in accordance with CSA C22.1 Canadian Electrical
Code Part One. Ensure the power supply (voltage, frequency, and current carrying capacity of wires) is in accordance with unit nameplate.
Lock off all power sources
before unit is wired to power source.
An optional location to install the disconnect
switch box directly on the ERV unit is identified
by the label “Input Power” located on the right
hand side of the unit. To install, you first need
to remove the screw located in the middle of
the label. The screw hole should now be used
as the reference hole to drill a 3⁄4” opening to
gain access to the electrical box. Care should
be followed so that components inside the elec-
trical box are not damaged by the drill bit. Al-
ternatively, units may have knockouts to make
this task easier to the installer. Once the hole
has been drilled, or the knockouts removed, a
water tight seal or washer must be installed in
between the disconnect switch and the ERV to
prevent water from entering either the switch
box, electrical box, or between the ERV double
wall and wetting the insulation. We recom-
mend using a Thomas & Betts Cat# 5263
3⁄4” sealing ring or equivalent UL Listed Type
4 (NEMA 4) rated sealing washer. This sealing
washer shall be used in conjunction with a 3⁄4”
X 1-1/2” conduit fitting. See Figure 8.
Follow the wiring diagram inside the electrical enclosure (also found further in the manual). Correctly label the circuit on the main power box and always identify a
closed switch to promote safety (i.e., red tape over a closed switch).
Electrical Knockout
Access to Wire Channel
in Roofcurb
3/4" Locknut
3/4" Sealing Rin
g
Disconnect Switch Enclosure
3/4" Locknu
t
INSTALLATION - CONT.
OPERATIONS AND MAINTENANCE
COMMISSIONING THE ENERGY RECOVERY UNIT PACKAGE SYSTEM
Make sure that all packing materials and hold down straps are removed and isolators are in the operating position prior to start up.
Packaged systems can normally be operated from various starting devices, from start-stop switches, remote panels, time clock devices, and/or other
interlocks. Prior to starting the unit, check to see that all circuit interlocks are in the “
on
” position. This includes all safety switches and/or miscel-
laneous controls included in the packaged system. Check control schematics and related circuit diagrams furnished with each unit. The following
pages are pre-start-up guidelines which should be followed carefully. If any problems exist, startup of the unit should not take place without consulting
the Systemair representative or the factory.
START UP CHECKS
Pre-Start Check List
•
Disconnect and lock-out all power switches to unit.
General
•
Check all fasteners for tightness.
•
Check dampers that they open and close without binding.
Fan Wheel Rotation
•
Hand rotate the fan impeller to ensure there’s no rubbing against the inlet ring.
•
Check fan rotation by opening the access doors and running each fan momentarily to determine the rotation.
If the impeller is rotating in the wrong direction “Clockwise when facing the inlet of the motor” turn the power off and use the following procedure:
– For single phase units, rewire the motor per the instructions on the motor.
– For three phase units, interchange any two power leads.
Energy Recovery Wheel
•
Turn the energy recovery wheel by hand to verify free operation.
•
Check if the belt and pulley are align properly and run smoothly.
•
Check that the air seals, located around the outside of the wheel and across the center (both sides of wheel), are secure and in good condition.
•
Observe that the wheel rotates freely at about 20 RPM.
If wheel does not rotate or rotates too slowly, remove the cassette (following the instruction on page 7). Air seals, which are too tight, will prevent
proper rotation of the energy recovery wheel. Recheck the air seals for tightness. Air seal clearance may be checked by placing a sheet of paper, to act
as a feeler gauge, against the wheel face. To adjust the air seals, loosen all seal retaining screws.
**WARNING**
DO NOT OPERATE ENERGY RECOVERY VENTILATOR WITHOUT THE FILTERS AND BIRDSCREENS
INSTALLED. THEY PREVENT THE ENTRY OF FOREIGN OBJECTS SUCH AS LEAVES, BIRDS, ETC.
DO NOT REMOVE UNIT COMPONENTS WHILE STANDING ON A LADDER OR OTHER UNSTEADY
BASE. UNIT COMPONENTS ARE HEAVY AND SERIOUS INJURY MAY OCCUR.
Figure 8:
Disconnect swtich
optional installation location
