Carrier 38VMH-1P Service Manual page 21

:
SW1 button on PCB is for force cooling mode. Press once to enter the force cooling mode, and press twice to exit the operation.
SW2 button is the query button. The LED will display the parameter values by the number of pushes per SW2 query
instructions.
No. Description
*1
0
Normal display
*2
1
Operating mode
2 Operating fan speed
3 The total capacity demands of indoor units
4 The capacity requirement of the revised external unit
5 T3 (Condenser temperature)
6 T4 (Outdoor temperature)
7 T5 (Compressor discharge temperature)
8 The surface temperature of the heat exchanger
9 Opening of EEV
10 Unit current
11 1/10 of DC bus voltage
12 T2A average temperature (indoor unit)
13 Total number of indoor units
14 Number of the operating indoor units
*3
15
Outdoor unit capacity
16 Discharge pressure
17 Saturation temperature of the discharge pressure
*4
18
Priority mode
19 Version of the program
20 Last error of protection code
21 Display "--"
NOTES:
1. Normal display: If standby, the LED displays the quantities of indoor units communicated. Otherwise, it displays the rotation frequency
of compressor. It may display 0 Hz at startup stage. When defrosting, it displays dF.
2. Mode:
0 = OFF
2 = Cooling
3 = Heating
4 = Forced cooling mode
3. 3 Ton-12 (KW), 4 Ton-14 (KW), 5 Ton-16 (KW)
4. 0-Heating priority mode:
1 = Cooling priority mode
2 = VIP
4 = Cooling only
5 = Debugging mode No.1
6 = Debugging mode No.2
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 22 —Spot Check Query Instructions
0
0, 2, 3, 4
Actual value
Actual value
Actual value (if the temperature over 100, DIS1 will only display the first two values)
Actual value
Actual value = Display value x 8
Actual value / 10
12, 14, 16
Actual value = Display value x 0.1 MPa
0, 1, 2, 4, 5, 6
None with "nn"
21
Note