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NOVUS PLUS INSTALLATION INSTRUCTIONS
2. HRV200PLUS Defrost Mode
a.
The HRV200PLUS demands gas appliance operation for defrost. This occurs when the following conditions exist:
1)
The appliance is not in use.
2)
The outdoor temperature falls below 25° F.
3)
The DEFC1 jumper is not installed on the HRV200PLUS circuit board.
b.
The HRV200PLUS does the following:
1)
Turns blowers on to high speed.
2)
Positions HRV200PLUS dampers (if installed) for appliance operations.
3)
Presents a 15-second delay (pre-purge) before burners are lit.
4)
Closes the contacts between the R1 and R2 terminals to initiate the ignition sequence (by energizing relay K1 on the
circuit board).
c.
The Novus Plus does the following:
1)
The Novus Plus awaits the signal from the HRV200PLUS to light the burners.
2)
When the contact between R1 and R2 closes in the HRV200PLUS, the intermittent pilot ignition (IPI) system activates and
lights the burners.
3)
When the user demand for appliance operation is removed, the HRV200PLUS de-energizes C2 and R1 terminals,
terminating burner operation.
4)
There is a 20-second delay (post-purge) on the HRV high fan and a 5-minute delay on the HRV low fan.
d.
The HRV200PLUS shuts off.
Note:
The HRV200PLUS can use indoor air instead of the gas appliance for defrost if the optional defrost kit (part # HRV99DEFKIT)
is installed.
11/04
The appliance may operate to defrost the HRV200PLUS at any time.
4031-478 Rev i
!
WARNING
13
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