Greenheck ERVe Series - Control Center Components

CAUTION
If any of the original wire as supplied with the
appliance must be replaced, it must be replaced
with wiring material having a temperature rating of at
least105ºC.
CAUTION
High voltage wiring is run in the top roof panel(s)
of this unit. Do not install sensors or other devices
through the top panel(s).
WARNING
To prevent injury or death due to electrocution
or contact with moving parts, lock disconnect
switchopen.
Most factory supplied electrical components are
prewired. To determine what electrical accessories
require additional field wiring, refer to the unit specific
wiring diagram located on the inside of the unit control
center access door. The low voltage control circuit
is 24 VAC and control wiring should not exceed
0.75ohms.
Refer to Field Control Wiring Length/Gauge table for
wire length maximums for a given wire gauge.
Control wires should not be run inside the same conduit
as that carrying the supply power. Make sure that field
supplied conduit does not interfere with access panel
operation.
If wire resistance exceeds 0.75 ohms, an industrial-
style, plug-in relay should be added to the unit control
center and wired in place of the remote switch (typically
between terminal blocks R and G on the terminal strip
(refer to Typical Control Center Components). The relay
must be rated for at least 5 amps and have a 24 VAC
coil. Failure to comply with these guidelines may cause
motor starters to “chatter” or not pull in which can
cause contactor failures and/or motor failures.
Field Control Wiring Length/Gauge
Total
Wire Length
Minimum
Wire Gauge
125 ft. 18
200 ft. 16
300 ft. 14
450 ft. 12
Typical Control Center Components
1. Main disconnect (non-fusible, lockable)
2. Distribution block
3. 24 VAC control transformer
4. Fuses
5. VFD blowers or contactor without VFD
6. VFD wheel or contactor without VFD
7. BMS controller
8. Outdoor airflow monitor
9. Dirty filter pressure switch
10. Wheel pressure switch
11. Low voltage terminal strip
12. Relays
1
3
7
11
12
9
8
10
4
2
4
5
5
6
Energy Recovery Ventilator 9
®