Rev 6.1 November 1, 2016
18
3.2.1.4.
Remote 2-wire switching
Status LEDs & Mode of Operation
From mid-April, 2013, all control boards are equipped with status lights to indicate mode of operation.
*Where available.
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 HIGH SPEED*
Red led ON, Green led blinking fast.
2-Wire Switch
For intermittent high speed operation, connect dedicated (RNC) wall
switch, CO
2
sensor, etc. to R and Hi terminals.
Jumper Option 1
: For continuous low speed, connect jumper wire to
R and LO terminals.
Jumper Option 2
: A jumper wire between R and SB to engage the
unit in
standby mode
when intermittent operation is desired will
close off integral outside air damper when present.
Do not employ Jumper option 1 AND Jumper Option 2 in same
installation.
U
N
IT
2
4
V
A
C
R
EM
O
V
A
B
LE
TE
R
M
IN
A
L
B
LO
C
K
NC
I
NO
R
C
TL
TS
SB
Hi
LO
J
U
M
P
E
R
W
IR
E
J
U
M
P
E
R
W
IR
E
BLACK
BLACK
