Compressor Pi Control - Daikin VRV EMERION REYQ-AATJA Service Manual

SiUS372201EB
Branch Selector unit actuator
Electronic
expansion Y1E
valve (EVSC)
Electronic
expansion Y2E
valve (EVH)
Electronic
expansion Y3E
valve (EVL)
5.2

Compressor PI Control

Carries out the compressor capacity PI control so that Te reaches the target value during cooling
and Tc during heating.
Cooling
Controls compressor capacity to adjust Te to achieve target value (TeS).
1. VRT control (default)
2. Constant control
Te setting
Te: Low pressure equivalent saturation temperature
TeS: Target temperature of Te (Varies depending on Te setting, operating frequency, etc.)
Heating
Controls compressor capacity to adjust Tc to achieve target value (TcS).
1. VRT control (default)
2. Constant control
Tc setting
Tc: High pressure equivalent saturation temperature
TcS: Target temperature of Tc (Varies depending on Tc setting, operating frequency, etc.)
Part 4 Functions and Control
Normal cooling
Thermostat ON
Non-operating
Thermostat OFF
Thermostat ON 6,000 pulse
Non-operating 6,000 pulse
Thermostat OFF 6,000 pulse
Thermostat ON 6,000 pulse
Non-operating 6,000 pulse
Thermostat OFF 6,000 pulse
When the indoor temperature approaches the set temperature in all indoor units and the
required capacity decreases, TeS is automatically increased to adjust the capacity.
TeS is fixed to the set value.
L M
3°C 6°C
(37.4°F) (42.8°F)
When the indoor temperature approaches the set temperature in all indoor units and the
required capacity decreases, TcS is automatically decreased to adjust the capacity.
TcS is fixed to the set value.
41°C 42°C
(105.8°F) (107.6°F)
Normal simultaneous cooling/heating
Cooling
0 pulse 0 pulse
0 pulse 0 pulse
0 pulse 0 pulse
0 pulse
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
7°C 8°C
(44.6°F) (46.4°F)
L
43°C 44°C
(109.4°F) (111.2°F)
Normal heating
Heating
Subcooling degree
control
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
0 pulse
0 pulse
0 pulse
H
9°C 10°C
(48.2°F) (50.0°F)
M
45°C 46°C
(113.0°F) (114.8°F)
Basic Control
0 pulse
0 pulse
0 pulse
6,000 pulse
6,000 pulse
6,000 pulse
0 pulse
0 pulse
0 pulse
11°C
(51.8°F)
H
48°C
(118.4°F)
150