SiE-05C
Outline of Control
Functions PLUS Series
245
When Cooling (In Case of Cooling Only System)
Indoor Unit Fan Control
HPS operation for either STD outdoor unit 1 or 2
→
Fixed to L tap ON by thermostat unit only.
Control IN conditions &
Emergency operation setting
Outdoor temperature detected to be above 20˚C
for STD outdoor unit 1
: Operates No. 1 compressors only of STD outdoor unit 1 and 2.
: Operates all compressors of STD outdoor unit 1 and 2.
Step 1
Step 2
Oil return
Comp-
ressor
Outdoor
unit fan
Function unit's solenoid valve
INV outdoor
unit
STD outdoor
unit 1
STD outdoor
unit 2
5 minutes elapse
Liquid pipe temp.
of STD outdoor unit 2 below 58˚C
Liquid pipe temp. STD outdoor unit 1 > 60˚C
Indoor units execute superheating
control in this mode.
0 Hz + OFF
H + ON
Y5-ON
ON + OFF
H + ON
Y6-OFF
ON + OFF
H + ON
Y7-OFF
Comp-
ressor
Outdoor
unit fan
Function unit's solenoid valve
INV outdoor
unit
STD outdoor
unit 1
STD outdoor
unit 2
0 Hz + OFF
H + ON
Y5-ON
ON + ON
H + ON
Y6-OFF
ON + ON
H + ON
Y7-OFF
Comp-
ressor
Outdoor
unit fan
Function unit's solenoid valve
INV outdoor
unit
STD outdoor
unit 1
STD outdoor
unit 2
0 Hz + OFF
H + ON
Y5-ON
ON + OFF
H + ON
Y6-OFF
ON + OFF
H + ON
Y7-OFF
Compressors operate total of 70 min.
following previous oil return.
: Operates by executing oil return for standard types 1 and 2.
Either malfunction, retry or outdoor temp.< 15˚C
Quit
3 minutes elapse
(VF124)
SI-05C.BOOK Page 245 Monday, November 6, 2000 4:13 PM
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