Heat Controller MSS-024B/A, MSH-0186/A, MSS-018B/A manual Rý u, Pipe Temp, Defrost OFF, Defrost on

rý u

Defrost Control

"Defrost operation is controlled by timer and sensing temperature of outdoor pipe.

"The first defrost starts only when the outdoor pipe temperature falls below 21°F after 60 minutes passed from starting of heating operation and more than 10 minutes operation of compressor.

"Defrost ends after 12 minutes passed from starting of defrost operation or when the outdoor fan operates with- in 4 minutes after the outdoor pipe temperature rises over WF even if before 12 minutes.

"The second defrost starts only when the outdoor pipe temperature falls below 21°F after 60 minutes passed from ending of the first defrost and more than 10 minutes operation of compressor.

OUTDOOR	More than 60 minutes of	Within	More than 60 minutes of	Defrost
PIPE TEMP.	heating operation	12minutes	heating operation
	More than 10 min.	Defrost	More than 10 min.
540F	running of compressor		running of compressor
(DEFROST OFF)

21°F
(DEFROST ON)
		Within	HOT-
		4 minute	START
INDOOR FAN SPEED	ON	OFF	ON	OFF
COMPRESSOR	ON	ON	ON	ON
4-WAY VALVE	ON	OFF	ON	OFF
OUTDOOR FAN	ON	OFF	ON	OFF

-19-

"