Installation; Hrv/Erv Heating Operation For Mxz System - Mitsubishi Electric PAA-A18AA1 Service Manual

10.2. Installation

A basic connection method is shown below.

10.3. HRV/ERV heating operation for MXZ system

When using an HRV/ERV, please take appropriate consideration when operating it during heating.
Sequence of operation:
MXZ-3C24/3C30/4C36/5C42NA3
1. The ERV demand switch closes CNER
MXZ-3C24/3C30NAHZ3 2. 12VDC is provided to CN2C to turn on ERV
3. If the unit goes into defrost, CN2C stops 12VDC output
MXZ-SM36/42/60NAM
ERV Switch:
MXZ-SM36/42/48NAMHZ
Non-Voltage a-contact input
Contact rating voltage >= 15VDC
Contact rating current >= 0.1 A
Minimum applicable load <= 1mA at DC
ERV output
Condition
CNER input
Cool/Heat/Fan operation
OFF Defrost
STOP
Cool/Heat/Fan operation
ON Defrost
STOP
RC: Remote controller
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
Part Number: PAC-740
max 30 ft.
Model
Fan speed
RC setting
STOP
STOP
RC setting
STOP
STOP
Control board control box
Description
When the furnace blower is moving air for
HRV/ERV operation, the unit may provide warm
air to the occupied space, even in Thermo-Off
mode.
CN2C output
(=Fan output)
ON
OFF
OFF
ON
OFF
ON
40
Control box
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