Installation Requirements
The following installation requirements must be followed:
•
Timers mount in standard 2 x 4” (51 x 102 mm) electrical boxes.
•
If multiple timers are used, individually wire each timer to the unit.
•
Use 3-wire 20−gauge (min.) low−voltage wire.
Installation of 20/40/60 Minute Timer (435247)
Lockout Mode
The timer can be set to lockout mode (timers disabled) as follows: press and hold the
button for five seconds; the status lights will flash; then release the button. The timer
is now in lockout mode.
If the button is pressed during lockout mode, the status lights will momentarily
illuminate but no override will be initiated. If lockout mode is initiated when the timer
is activated, the timer will continue its timed sequence but will not allow any further
overrides to be initiated.
To unlock lockout mode, press and the button for five seconds; until the high-speed
status lights stop flashing; then release the button. The timer will now operate
normally.
Select Button
20/40/60 Minute
Status Lights
1
2
3
4
5
6
7
8
9
10
LOW
ON
RED
YEL
GRN
HI
COM
NO
NC
BLK
GRN
YEL
RED
YEL
RED
GRN
TERMINAL BLOCK Connections
(From timer to terminal block)
Yellow on timer to YELLOW #4
Red on timer to RED #3
Green on timer to GREEN #5
Caution: Low Voltage Only
The ERV is compatible with two wire, “dry contact” third party mechanical timers. This
may be useful for retrofit situations where only two wires are available for the timer.
Install the two wire timer by connection a jumper wire between ON and RED. Connect
the two timer wires to ON and HI.
NOTE: An alternative to using the 2-wire timers is to install the system with wireless
timers.
Connecting the ERV unit as illustrated will ensure the air handler/furnace
blower motor is operating whenever the ERV is ventilating.
The ERV unit must be interlocked to the furnace/air handler with a simplified
(return/return) installation and a partially dedicated installation as illustrated in
the following figure.
Note: Terminal Block “Type A” displayed in figures, refer to “Terminal Blocks”
on page 21.
Installation of Third Party Mechanical Timers
Interlocking ERV to Air Handler/Furnace Blower
1
2
3
4
5
6
7
8
9
10
LOW
ON
RED
YEL
GRN
HI
COM
NO
NC
BLK
Connect the two wires from the timer
to ON and HI on the terminal block
2-wire timers
require a jumper
between ON and
RED on the
terminal block
OFF
10
20
40
30
50
60
Caution: Low Voltage Only
1
2
3
4
5
6
7
8
9
10
LOW
ON
RED
YEL
GRN
HI
COM
NO
NC
BLK
R
Thermostat
G W Y C
R G W Y
Wire
connection
CAUTION: Low Voltage Only
Furnace or air handler
Figure 32. 20/40/60 Minute Timer
Figure 33. Dry Contacts Connections
Figure 34. Air Handler/Furnace Blower Connections
Residential Energy Recovery Ventilators
24
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