Midea M-Thermal Series Service Manual page 38

Hydronic system SW4 check button
Button SW4 is used to check the parameters of the hydronic system. Refer to Table 4‐2.1. First, press Button SW4 for 3
seconds and the first parameter (operating mode) will be displayed. Then, on each subsequent press, the next parameter
is displayed.
Table 4‐2.5: SW4 system check
Number Parameters displayed on digital display
1 Mode
2 Capacity Requirements
3 Capacity Requirements (Correct)
4 T1: Backup electric heater exchanger water outlet temperature
5 T1B: Leaving water temperature of region 2
T1S: Target leaving water temperature of region 1 calculated
6
from climate‐related curves (°C)
T1S2: Target leaving water temperature of region 2 calculated
7
from climate‐related curves (°C)
8 Ta: Room temperature (°C)
:
9
T5 DHW tank temperature (°C)
:
T2 Water side heat exchanger refrigerant inlet (liquid pipe)
10
temperature
:
T2B Water side heat exchanger refrigerant outlet (gas pipe)
11
temperature
Tw_out: Water side heat exchanger water outlet temperature
12
(°C)
13 Tw_in: Water side heat exchanger water inlet temperature (°C)
:
14
T4 Outdoor ambient temperature (°C)
15 Current (Reserved)
16 Current (Reserved)
17 Last failure
18 Last second failure
19 Last third failure
20 Software version
21 ‐‐
Digital Display Output
Table 4‐2.6: Digital display output in different operating states
M‐Thermal Split system state
On standby
Normal operation
Error or protection
System check
201909 37
Parameters displayed on outdoor
unit main PCB DSP1
0
Running speed of the compressor in
rotations per second
Error or protection code
Refer to Table 4‐2.4
Midea CAC Confidential
Remarks
0: off; 2: cooling; 3: heating; 5: DHW.
Actual value = value displayed
Actual value = value displayed
When no decimal point is displayed:
Temperature is ≥ ‐9°C, Actual value = value displayed
When decimal point is displayed between the two digits:
Temperature is ≤ ‐10°C, Actual value = value displayed x ‐10
Example: "1.2" indicates ‐12°C
Actual value = value displayed
Actual value = value displayed
Actual value = value displayed (If Ta is used)
When no decimal point is displayed:
Temperature is ≥ ‐9°C, Actual value = value displayed
When decimal point is displayed between the two digits:
Temperature is ≤ ‐10°C, Actual value = value displayed x ‐10
Example: "1.2" indicates ‐12°C
‐‐
‐‐
"‐‐" is displayed if no error or protection events have occurred
since start‐up
"‐‐" is displayed if no error or protection events have occurred
since start‐up
"‐‐" is displayed if no error or protection events have occurred
since start‐up
Version number
Parameters displayed on hydronic
box main PCB DSP1
0
Leaving water temperature (°C)
Error or protection code
Refer to Table 4‐2.5
M‐Thermal Split