31
System Operation 18,000/24,000 btuh Models, cont.
Heating Process, cont.
Defrost Process and Oil Return
(Indoor display will indicate “H1”, this is not a fault code)
1) The unit will enter defrost when the following conditions are met:
A. Outdoor ambient <= 410 F
B. Compressor had accumulated more than 3 hours of operation in heating mode
C. The outdoor coil <= 320 F
Note: The compressor run time will be cleared when the outdoor ambient is > 410 F or when the compressor has started
up after changing to cooling or drying mode and defrost has finished. The run time will not be cleared when the unit has
stopped after reaching the setpoint temperature, a protection fault or changing to fan mode.
There are 3 perimeters used in the defrost algorithms, Outdoor ambient(T
outdoor
ambient), Outdoor tube(T
outdoor
tube) and
a calculated T
compensation
T
compensation
is calculated by the following:
A. After energization, for the first defrost T
compensation
= 320 F
B. T
outdoor
tube > 360 F then T
compensation
= 320 F
C. T
outdoor
tube <= 360 F then T
compensation
= 370 F
+9
0
F
+ 2
0
F
Stop heating
Basic Functions
Product Introduction
Содержание TERRA09HP230V1A
Страница 13: ...13 Product Introduction Operation Characteristic Curve ...
Страница 14: ...14 Product Introduction Capacity Variation Ratio According to Temperature ...
Страница 16: ...16 Noise Criteria Curve Tables Product Introduction ...
Страница 54: ...54 Electrical Schematics ...
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