20
ERV (ENERGY RECOVERY VENTILATION) CONTROL
11
The below table shows how the field installed ERV is controlled.
A basic connection method is shown below.
ERV output
Condition
Fan speed
CN2C output
(=Fan output)
CNER input
OFF
Cool/Heat/Fan operation
RC setting
ON
Defrost
STOP
OFF
STOP
STOP
OFF
ON
Cool/Heat/Fan operation
RC setting
ON
Defrost
STOP
OFF
STOP
Low
ON
XB
XF
ERV
ERV switch
XB
On-site preparation
Maximum cable length is 10m(32ft)
CNER
CN2C
Indoor unit
control board
ER
V
pow
e
r sourc
e
Use XB relay having following specifications
Rated voltage:12VDC
Power consumption:1W or less
ERV switch:Minimum applicable load 1mA at DC
Contact rating voltage:15VDC or more
Contact rating current:0.1A or more
11-1. CONTROL SPECIFICATIONS
11-2. INSTALLATION
HWE1406A.qx 3/19/15 9:02 AM Page 20
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