Panasonic U-120ME2U9, Руководство по обслуживанию, Страница: 16 / 206

2WAY VRF SYSTEM
Control Functions
1 - 8
1
2
3
4
5
6
7
8
9
3. Compressor Control
6-2. Condensation temperature adjustment by roadmap control
The area B target temperature is different due to cooling and heating operation.
Target lower temperature
(Tc_tgt_min)
Target upper temperature
(Tc_tgt_max)
Cooling 127.4°F (53.0°C) 131.0°F (55.0°C)
Heating 118.4°F (48.0°C) 123.8°F (51.0°C)
Cooling mode
The purpose of this control at cooling
is to prevent abnormal high-pressure.
1 Heating mode
Heating capacity is adjusted with this control.
It also prevents abnormal high-pressure simultaneously.
The capacity is controlled in the following diagram.
2
PX=136.4
(58.0)
PX=136.4
(58.0)
136.2
(57.9)
131.2
(55.1)
131.0
(55.0)
127.2
(52.9)
Thermostat
OFF
Compressor
capacity
decrease
Compressor
capacity
decrease
Compressor
capacity
increase
prohibited
Compressor
capacity
increase
possible
Compressor
capacity
increase
prohibited
Compressor
capacity
increase
possible
Area D
Area C
Area B
Area A
127.4
(53.0)
°F (°C) °F (°C)
・ Standard setting (at the shipment)
136.2
(57.9)
123.8
(51.0)
118.2
(47.9)
Thermostat
OFF
Area D
Area C
Area B
Area A
124.0
(51.1)
118.4
(48.0)
123.8
(51.0)
15 30 0
118.4
(48.0)
104.9
(40.5)
95.0
(35.0)
91.4
(33.0)
°F (°C)
Max. required level
109.4
(43.0)
* PX is usually fixed to 136.4°F (58°C). If the high pressure goes up rapidly after the compressor starts, the
system experiences urgent stop. The next time the system will start with lower PX.
* In the area B, the compressor capacity changes depending on the refrigerant condition.
* When the system operates in a minimum capacity, the system will continue operating for at least 6 minutes
if the condensation temperature area is area C.
* The condensation temperature is not adjusted when there are one or more indoor units that select the test run.
Limit pressure adjustment function
Operation pressure is able to be adjusted for existing old piping.
If area shift function is set, values below shift.
EEPROM setting in main outdoor unit
CODE : 4B
Setting No. Limited pressure PX °F (°C) Cooling mode Heating mode
Tc_tgt_min Tc_tgt_max Tc_tgt_min Tc_tgt_max
0 478.5psi (3.3MPa) 126.5 (52.5) 116.6 (47.0) 120.2 (49.0) 116.6 (47.0) 118.4 (48.0)
1 No use - - - - -
2 551.1psi (3.8MPa) 136.4 (58.0) 127.4 (53.0) 131.0 (55.0) 118.4 (48.0) 123.8 (51.0)
3 No use - - - - -
SM830237-07_北米向け2WAY_VRF.indb 8 18/06/19 18:55:30