Elektronika SCM60ZD-S Manual page 38

<III>
(i) Operating conditions: When the outdoor unit is heating at a decision speed other than 0 rps and the temperature of the
outdoor heat exchanger sensor is –12ºC or lower.
(ii) Detail of condition: The decision speed is controlled as shown below.
(iii)Reset conditions: When the temperature of the outdoor heat exchanger is higher than –4ºC.
3) Reset conditions:
(k) High pressure cut protection control
High pressure cut protection control is executed when 1 or 2 units stop during heating while multiple units are operating.
1 If 1 unit only stops while multiple units are operating.
Functional components
A room
Command rps
Indoor
unit
command
Command rps
speed
B room
Command rps
C room
Decision rps
Decision speed
According to
Outdoor unit fan
decision rps
4-way valve
Fully opened
According to
EEV A
outdoor rps
Fully closed
Fully opened
According to
EEV B
outdoor rps
Fully closed
Fully opened
According to
EEV C
outdoor rps
Fully closed
38
-20 -16
Outdoor heat exchanger temp. (˚C)
When the decision speed becomes 0 rps from a speed other than 0 rps.
Operation of each functional components
0 rps
Command
2 min.
0 rps
0 rps
0 rps
0 rps
0 rps
ON
OFF
High pressure
cut protection
control
Decision speed
70 rps
40 rps
20 rps
-12 -4
Heating stop
unit control
Remarks
Command speed from indoor unit
that has "heating 0 rps".
Command speed for indoor unit
that has "other than heating 0 rps".
Command speed for indoor unit
that has "other than heating 0 rps".
Corresponding expansion valve for
unit with serial signal that has
"heating 0 rps".
Corresponding expansion valve for
unit with serial signal that has
"other than heating 0 rps".
Corresponding expansion valve for
unit with serial signal that has
"other than heating 0 rps".