Plug the ERV directly into a standard designated 120 VAC electrical outlet. Use of an extension cord is NOT RECOMMENDED for
this appliance.
If further wiring is required, then a licensed electrician should make all electrical connections. It is recommended that a separate
15 A/120 V circuit be used. See wiring diagrams for the units described in section titled ”Unit Wiring Diagrams” on pages 26 - 27.
Electrical Connections
IMPORTANT
Electric Shock Hazard
Can cause injury or death.
Confirm the polarity of the 120VAC supply source at the receptacle for the ERV device. The door safety switch of the ERV can cause an
electrical shock hazard if the polarity is not properly wired. The grounding means of the ERV device should also be confirmed.
The proper polarity and ground can be checked at the receptacle using a 3−prong plug device called a ’polarity tester’. Another method to
check for proper polarity is to use a volt−ohm meter to check for voltage from line voltage to ground (chassis) at the ERV.
Installing “Standby” Jumper
A jumper must be installed between the ON and R terminals to change the default OFF setting from “fully-
OFF” to “standby-OFF”. Timers will continue to initiate high speed ventilation while unit is in “standby-
OFF” with the exception of the 20/40/60 Minute Wireless Timer.
The ERV will be “fully-OFF” when OFF is selected on the main control and no jumper is installed between
the ON and R terminals. Timers and/or controls will not function when the ERV is “fully-OFF”.
On the PrecisionSYNC Control (435244) “standby-OFF” can be achieved by setting the control to ON
and
selecting speed 0. Timers will initiate high speed ventilation when activated.
CAUTION
Building codes in some areas require fully−off functionality. Check with your local building authority before modifying the unit to standby−off.
Unintentional operation of the ERV by the end user may occur if the unit is modified from fully−off to standby−off.
Activating Dry Contact Controls
Dry contact connections can be used to connect any third party controls or simple wire jumpers can be
used. Dry contacts will engage continuous low speed ventilation, continuous high speed ventilation, or
dehumidification. See Table 11 below. The dehumidification dry contact will be disabled in accordance
with the dehumidification disable function (see page 10).
The NO NC and COM connections are a relay that switches when the fans are turned on or off. These
connections can be used to control third party devices such as motorized dampers.
Note: contacts NO, NC and COM can only receive a 12 V signal.
1
2
3
4
5
6
7
8
9
10
LOW
RED
YEL
GRN
HI
COM
NO
NC
BLK
LOW
SPEED
OR
HIGH
SPEED
DEHUMIDISTAT
IMPORTANT
The ERV must have a jumper in place between 2 (ON) and 3 (RED) on the Terminal Block when installing the unit without a Control.
Table 11. Dry Contacts
Speed
Description
Low speed
A jumper between 2 (ON) and 1 (LOW) initiates low speed ventilation.
High speed
A jumper between 2 (ON) and 6 (HI) initiates high speed ventilation.
Dehumidistat
A dry contact for a dehumidistat is connected between 2 (ON) and 10 (BLK).
1
2
3
4
5
6
7
8
9
1 0
LOW
ON
RED
YEL
GRN
HI
COM
NO
NC
BLK
Figure 35. Standby Jumper
Figure 36. Dry Contact Controls
Note: Terminal Block “Type A” displayed in figures, refer to “Terminal Blocks” on page 21.
Residential Energy Recovery Ventilators
25
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