Off Defrost Operation Control - Rheem RHMV2421MNACJA Service Manual

12. OFF DEFROST OPERATION CONTROL

When operation stops in the [Heating operation] mode, if frost is adhered to the outdoor unit
condenser coil, the defrost operation will proceed automatically. In this time, if indoor unit operation
lamp flashes slowly (7 sec ON / 2 sec OFF), the outdoor unit will allow the condenser coil to defrost,
and then stop.
1. OFF DEFROST OPERATION CONDITION
In heating operation, the outdoor condenser coil temperature is less than 24.8°F (-4°C), and
compressor operation integrating time lasts for more than 30 minutes.
2. OFF DEFROST RELEASE CONDITION
OFF defrost operation is released when the conditions becomes as below.
Outdoor condenser coil temperature is higher than
Compressor operation time has passed 15 minutes.
3. OFF DEFROST FLOWCHART
Outdoor condenser coil temperature : Over
or
Heating operation stop
Outdoor condenser coil temp. :
Below 24.8°F (-4°C)
and
Compressor integrating operation :
Over 30 minutes
Defrost start
Defrost Indicator: [Operation lamp]
6 sec ON / 2 sec OFF (RP1724,30HJVXA)
7 sec ON / 2 sec OFF (RP1736,48HJVXA)
Compressor ON time : Maximum 15 minutes
Defrost end
55.4°F (13°C) (RP1724, 30HJVXA)
59.0°F (15°C) (RP1736, 48HJVXA)
55.4°F (13°C)
59.0°F (15°C)
or
04-28
(RP1724, 30HJVXA)
(RP1736, 48HJVXA)