Nu-Air Ventilation Systems Inc. - HRV Operating & Installation Manual
Rev. 2.3 Aug. 19, 2014
- 23 -
G
A
B
12
UNI
T
1
2
VDC R
E
MO
VA
B
L
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T
E
R
MI
NAL
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+12
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ES SERIES
CONTROL
10.13.
Unit Control Board: Status LEDs & Remote Control Connections
The unit control board is divided into two “sections” comprising a 12V RS485 control standard and a
24V standard. With this feature, the user may use ES Series 12V controls and/or Windsor Series 24V
controls or 2-wire, 24V switch.
From mid-April, 2013 onward, all control boards are equipped with status lights to indicate mode of
operation.
*Where available.
10.14.
ES Series Control Wiring
Using a 3 mm flat head screwdriver, connect 4-
conductor wire to the 12V (4-wire) removable terminal
block for:
ES-T1, ES-M1, ES-M2, ES-M3, ES-
M4, ES-M5, ES-DVC
DO NOT
cross the (+12V/12) and ground
(GND/G) wires
.
For ES controls, doing so with power connected to the
H/ERV will short-circuit and destroy the ES wall control
processor.
Notes:
1.
ES controls can be connected in
SERIES
or
PARALLEL
.
2.
ES Controls can be used in installations where any of the 24V control options discussed in this
document are employed.
3.
If you are using
ONLY
an
ES-T1
to control your unit, you must connect a jumper wire between
R and SB on the 24V (10-wire) removable terminal block. In this situation you can add
continuous low speed operation by connecting a jumper wire between R and LO. Consult local
building code in case a centrally located control with an on/off switch is required.
CONDITION
LED AND STATUS
NO LED
UNIT/TRANSFORMER IS NOT POWERED
UNIT OFF
Red is off, Green is blinking slow, every 1 s. Also indicates processor is
programmed and running.
STANDBY
Green is OFF. Red led is blinking slow, every 1 s.
EXHCHANGE LOW SPEED
Green ON. Red blinking slow, every 1 s.
EXCHANGE HIGH SPEED
Green ON. Red blinking fast.
DEFROST
Green ON, Red ON.
RECIRCULATION LOW SPEED*
Red led ON, Yellow blinking slow, every 1s.
RECIRCULATION HIGH SPEED*
Red led ON, Green led blinking fast.
