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ESIE02–01
Overview of the cooling mode functions
Part 2 – Functional Description
2–33
3
2
4
5
1
2.6
Low Outside Temperature Control in Cooling Operation
(Year Round Cooling)
Applicable units
R(Y)P71-250
Purpose
The purpose of the control is to prevent freezing of the indoor heat exchanger due to:
■
Drop of the low pressure
■
Indoor heat exchanger temperature (Te).
Method
The method to control is reduction of the air flow volume of the outdoor unit fan.
Starting and ending
conditions
■
The control is not activated during start-up control.
■
The control is activated when the outdoor temperature drops below (41.7 - 0.84 x room suct
ion
temp
erature
). At this temperature, the outdoor fan speed switches to L-tap.
■
The differential for the return condition is 4 K.
Outside air
temp. (Ta)
(˚CDB)
Indoor suction
air temp. (Tr)
(˚CDB)
L tap range
H tap range
Ta < 45.7 - 0.84
x
Tr
Ta > 41.7 - 0.84
x
Tr
(H tap return condition)
(L tap condition)
21
37
-5
46
24
28
11
15
Summary of Contents for Sky Air R-407C
Page 1: ...ESIE02 01 Service Manual Sky Air R 407C B series SV p p p...
Page 2: ......
Page 3: ...ESIE02 01 Service Manual Sky Air R 407C B series SV p p p...
Page 4: ......
Page 16: ...Introduction ESIE02 01 xii 3 1 4 5...
Page 18: ...ESIE02 01 1 2 Part 1 System Outline 3 1 1 5...
Page 42: ...General Outline Outdoor Units ESIE02 01 1 26 Part 1 System Outline 3 1 1 4 5...
Page 49: ...ESIE02 01 General Outline Indoor Units Part 1 System Outline 1 33 3 1 4 5...
Page 72: ...General Outline Indoor Units ESIE02 01 1 56 Part 1 System Outline 3 1 1 4 5...
Page 86: ...Specifications ESIE02 01 1 70 Part 1 System Outline 3 1 1 4 5...
Page 110: ...ESIE02 01 1 94 Part 1 System Outline...
Page 130: ...Switch Box Layout ESIE02 01 1 114 Part 1 System Outline 3 1 1 4 5...
Page 180: ...PCB Layout ESIE02 01 1 164 Part 1 System Outline 3 1 1 4 5...
Page 182: ...ESIE02 01 2 2 Part 2 Functional Description 3 1 2 5...
Page 204: ...General Functionality ESIE02 01 2 24 Part 2 Functional Description 3 1 2 4 5...
Page 216: ...Overview of the cooling mode functions ESIE02 01 2 36 Part 2 Functional Description 3 1 2 4 5...
Page 232: ...ESIE02 01 3 2 Part 3 Troubleshooting 3 1 3 5...
Page 294: ...Error Codes System Malfunctions ESIE02 01 3 64 Part 3 Troubleshooting 3 1 3 4 5...