Specifications
VCES-ERV-IOM-1A – ERV500i/e
9
disconnect switch must use a liquid-tight connector be-
tween the disconnect switch and the outside panel of the
unit eliminating any water penetration into the control
box. A wiring diagram is located on the control box lid in-
side of the unit.
The low voltage connection runs through the roofcurb and
roof opening to the bottom panel. Low voltage remote
wiring terminal is located inside the unit on the control
box. Installer must provide wiring for the controls that may
be supplied optionally.
¾” locknut
¾” locknut
(as seen from
inside the unit)
Rooftop unit
(cutaway shown)
Line disconnect switch
(cutaway shown)
¾” x 1-3/8” liquid-tight connector
Figure 3: High voltage field connection
A low voltage remote control wiring interface is provided on
the unit. The installer must provide wiring for the controls
that may be supplied optionally. The optional wall controls
require a four-wire LVT 24 gauge (or equivalent). This con-
trol is 12 VDC. Other terminals are 24 VAC or dry contact
control. Terminals are available for the following controls:
• Low-Com-High
– Makes dry contact for speed setting.
• Wall control
– Four-wire LVT 24 gauge minimum (12 VDC).
• Occupied timer/sensor
– Needs dry contact to operate. 24 VAC is required
when timer is used. Do not use with Xtra wall
control.
• Enthalpy control
– 24 VAC.
• Remote fan control
– Requires single pole, double throw switch.
• Low temperature control
– Makes dry contact.
• Wheel rotation sensor
– Makes dry contact.
• CO
2
ventilation control
– Makes dry contact.
• Unoccupied recirc contacts (ERV500i only)
– 24 VAC.
• Smoke detector
– Makes dry contact.
For more information on the controls available for the
energy recovery ventilators, see the following Appendix G
references:
• Wall Control Connection
• Occupied Timer/sensor Connection
• Enthalpy Control
• Remote Fan Control
• Low Temperature Control
• Wheel Rotation Sensor
• CO
2
Ventilation Control
• Unoccupied Recirc Contacts (ERV500i only)
• Smoke Detector
Start-up
Controls