In Case Of Cooling Only System - Daikin VRV Inverter K Series Manual

SI-05C.BOOK Page 249 Monday, November 6, 2000 4:13 PM
SiE-05C

4.19.2 In Case of Cooling Only System

Pump Down
First fully close the liquid side and pressure equalizing side stop valves of the INV outdoor unit. The
Operation of INV execute low pressure control by setting indoor unit fan to L or off in accordance with the outdoor
Outdoor Unit temperature and No. 2 system outdoor unit suction pipe temperature.
Pump Down First fully close the liquid side and pressure equalizing side stop valves of the STD outdoor unit to be
Operation of STD
pumped down. The indoor unit fan is fixed at L tap.
Outdoor Unit
Normal cooling operation is executed by INV outdoor unit and STD outdoor unit 2 only.
Normal cooling operation is executed by INV outdoor unit and STD outdoor unit 1 only.
Outdoor unit operation is same as STD outdoor unit 1.
Functions PLUS Series
Step 1 : Operates No. 1 compressors only of STD outdoor unit 1 and 2.
Comp- Outdoor
ressor unit fan
INV outdoor
0 Hz + OFF H + ON
unit
STD outdoor
ON + OFF H + ON
unit 1
STD outdoor
ON + OFF H + ON
unit 2
l No. 2 outdoor unit liquid pipe temp.
l 5 minutes elapse
Step 2
: Operates all compressors of STD outdoor unit 1 and 2.
Comp- Outdoor
ressor unit fan
INV outdoor
0 Hz + OFF H + ON
unit
STD outdoor
ON + ON H + ON
unit 1
STD outdoor
ON + ON H + ON
unit 2
To pump down refrigerant of STD outdoor unit 1
Comp- Outdoor
ressor unit fan
INV outdoor
P I control H + ON
unit
STD outdoor
OFF H + ON
unit 1
STD outdoor
P I control H + ON
unit 2
To pump down refrigerant of STD outdoor unit 2:
Function unit's solenoid
Y5-ON
Y6-OFF
Y7-OFF
below 58˚C
&
Function unit's solenoid
Y5-ON
Y6-OFF
Y7-OFF
Function unit's solenoid
Low pressure
protection control
Y6-ON
Low pressure
protection control
: http://splitoff.ru/tehn-doc.html
Outline of Control
Indoor units execute
superheating control in this
mode.
STD outdoor unit 2 liquid
pipe temp. above 60˚C
(VF127)
Indoor units execute
superheating control in this
mode.
(VF171)
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