Specifications
VCES-ERV-IOM-1A – ERV500i/e
8
Forced Air System
When the unit is installed in conjunction with a forced
air system, the air handler and the network of ducts as-
sociated with it are used to distribute fresh air inside the
building. If this type of system is used, the main fan of the
air handler must operate continuously when the unit is on.
Fan interlock can be connected in the unit control box to
the integrated control board terminals J3-1 and J3-2. The
controller makes relay contact between these terminals
when the unit is operating, as shown in Figure 2.
Fresh air from the unit should be introduced into the re-
turn duct of the air handler at a point no less than 6 feet
[1,829 mm] upstream of the air handler. The duct connec-
tion for stale air to the unit should be made on the return
air duct at least 2 feet [610 mm] upstream of the fresh air
duct connection.
Separate Systems
Select locations for exhaust grilles and supply diffusers
to provide effective ventilation and avoid short circuiting
airflows through the space. Adjustable dampers should be
provided at every grille and diffuser to make balancing of
the system possible.
Exterior Hoods
The outside air intake hood must be positioned away from
sources of contamination. A screen with ¼” [6 mm] grid is
recommended to prevent intake of debris and pests. The
screen should be removable in cold climates where frost
blockage may occur.
Power Supply
These units may or may not have a factory installed dis-
connect switch. If disconnect is field supplied, provide a
disconnect as per NEC. Use copper conductors only.
All field wiring must comply with NEC and local require-
ments. In Canada, electrical connections must be in accor-
dance with CSA C22.1 Canadian Electrical Code Part One.
Field Connection
A high voltage connection (shown in Figure 3) is located
on the outside of the unit with knockout. A field installed
Systems Integration
Electrical Connections
132
J1
6
9
4
7
G
1
J2
COMM.
N/C
N/O
J3
21
FF
J4
JU1
3
I
OC
OL
R
48644 power
control board
YB
A B C D E F G
Fan interlock
contacts
+++++ ++
+++++ ++
JU1G – Intermittent standy (IS)
JU1F – Extended defrost
Figure 2: Fan interlock control board
WARNING
Unit cabinet must have an uninterrupted, unbroken elec-
trical ground to minimize the possibility of personal injury
if an electrical fault should occur. Failure to follow this
warning could result in the Installer being liable for per-
sonal injury of others.
!
Table 1: ERV500 Power Supply
ERV500i ERV500e
Line voltage 120 230
MCA 9.4 11.1
MOP 10 15