Kaisai 06RY1, Service Manual

Page: 21 / 114

M thermal Mono
18 202008
Midea
M
ther
ma
l Mo
no
Se
rvice M
an
ual
Figure 3-3.3: 6 -10KW compressor startup program
1
when ambient temperature is at or
below 3°C (4-6KW)/11°C (8-10KW)
Figure 3-3.4: 12-16KW compressor startup program
1
when ambient temperature is at or below 3°C
Notes:
1. Once the first, 40-second stage of the program is complete, the program proceeds to the subsequent stages in a
step-by-step fashion and exits when the target rotation speed has been reached.
3.3 Startup Control for Heating and Domestic Hot Water Operation
Table 3-3.1: Component control during startup in heating and domestic hot water modes
Component
Wiring diagram
label
6kW
8/10/12/
14/16kW
Control functions and states
Inverter compressor COMP
● ●
Compressor startup program selected according to
ambient temperature
1
DC fan motor FAN
● ●
Fan runs at maximum speed
2
Electronic expansion valve EXV
● ●
Position (steps) from 0 (fully closed) to 480 (fully
open), controlled according to outdoor ambient
temperature, discharge temperature and suction
superheat
Four-way valve ST
● ●
On
3.4 Startup Control for Cooling Operation
Table 3-3.2: Component control during startup in cooling mode
Component
Wiring diagram
label
6kW
8/10/12/
14/16kW
Control functions and states
Inverter compressor COMP
● ●
Compressor startup program selected according to
ambient temperature
1
DC fan motor FAN
● ●
Fan run at maximum speed
2
Electronic expansion valve EXV
● ●
Position (steps) from 0 (fully closed) to 480 (fully
open), controlled according to outdoor ambient
temperature, discharge temperature and suction
superheat
Four-way valve ST
● ●
Off
Notes:
1. Refer to Figure 3-3.1, Figure 3-3.2, Figure 3-3.3 and Figure 3-3.4 in Part 3, 4.2 “Compressor Startup Program”.
2. Refer to Table 3-4.3 in Part 3, 5.6 “Outdoor Fan Control”.
TARGET FREQUENCY
TIME
TARGET FREQUENCY
TIME
Midea CAC Confidential
M thermal Mono
202008 19
Part
3
- Con
trol
4 Normal Operation Control
4.1 Component Control during Normal Operation
Table 3-4.1: Component control during heating and domestic hot water operations
Component
Wiring diagram
label
6kW 8/10/12/14/16kW
Control functions and states
Inverter compressor
COMP
● ●
Controlled according to load requirement from
hydronic system
DC fan motor FAN
● ●
Controlled according to outdoor heat exchanger
pipe temperature
Electronic expansion valve EXV
● ●
Position (steps) from 0 (fully closed) to 480 (fully
open), controlled according to discharge
temperature, suction superheat and compressor
speed
Four-way valve ST
● ●
On
Table 3-4.2: Component control during cooling operation
Component
Wiring
diagram label
6kW 8/10/12/14/16kW
Control functions and states
Inverter compressor
COMP
● ●
Controlled according to load requirement from
hydronic system
DC fan motor FAN
● ●
Controlled according to outdoor heat exchanger
pipe temperature
Electronic expansion valve EXV
● ●
Position (steps) from 0 (fully closed) to 480 (fully
open), controlled according to discharge
temperature, suction superheat and compressor
speed
Four-way valve ST
● ●
Off
4.2 Compressor Output Control
The compressor rotation speed is controlled according to the load requirement. Before compressor startup, the Mono
outdoor unit determines the compressor target speed according to outdoor ambient temperature, leaving water set
temperature and actual leaving water temperature and then runs the appropriate compressor startup program. Refer to
Part 3, 4.2 “Compressor Startup Program”. Once the startup program is complete, the compressor runs at the target
rotation speed.
During operation the compressor speed is controlled according to the rate of change in water temperature, the refrigerant
system pressure and the refrigerant temperature.
4.3 Compressor Step Control
The running speed of six-pole compressors (used on all models) in rotations per second (rps) is one third of the frequency
(in Hz) of the electrical input to the compressor motor. The frequency of the electrical input to the compressor motors can
be altered at a rate of 1Hz per second.
Midea CAC Confidential
Mono