Electronic Expansion Valve (Exv) Board - Carrier AQUASNAP 30RB060-390 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Electronic Expansion Valve (EXV) Board —
least one EXV board is used in all machines. There is one EXV
board for 2 circuit machines. Three circuit machines have two
EXV boards. See Fig. 5. The board is responsible for monitor-
ing the return gas temperature thermistors. The board also
signals the EXV motors to open or close. The electronic expan-
sion valve board responds to commands from the MBB and
sends the MBB the results of the channels it monitors via the
LEN (local equipment network). See below for DIP switch
DESCRIPTION
Power (24 vac supply)
Local Equipment Network
Circuit x High Pressure Switch
Compressor xn Motor Temperature
Compressor xn Contactor
Crankcase Heater
Circuit x High Pressure Switch
* "x" denotes the circuit, A, B or C. "n" denotes the compressor number, 1, 2, 3, or 4.
DESCRIPTION
Power (24 vac supply)
Local Equipment Network
Circuit A Suction Gas Thermistor
Circuit B Suction Gas Thermistor
Circuit A EXV
Circuit B EXV
At
Table 4 — Scroll Protection Module Inputs and Outputs*
INPUT/OUTPUT
—
—
HPS-x
MTR-xn
Cxn
CCH
HPS-x
Table 5 — EXV1 Board Inputs and Outputs
INPUT/OUTPUT
—
—
SGTA 5k Thermistor
SGTB 5k Thermistor
EXV-A Stepper Motor
EXV-B Stepper Motor
information for EXV1 and EXV2. See Tables 5 and 6 for EXV
inputs and outputs.
EXV1 DIP Switch
Address:
EXV2 DIP Switch
Address:
SCROLLING MARQUEE
I/O TYPE
POINT NAME
—
—
Switch Not available
PTC Thermistor Not available
Relay OUTPUTS
Relay OUTPUTS
Switch Not available
SCROLLING MARQUEE
I/O TYPE
POINT NAME
—
—
TEMPERATURE
TEMPERATURE

OUTPUTS

OUTPUTS
8
1 2 3 4 5
ON ON ON ON ON ON OFF ON
1 2 3 4 5
OFF ON ON ON ON ON OFF ON
CONNECTION POINT
Pin
SPM-xn-J1
— QC1
QC2
SPM-xn-JP1
1
2
3
—
SPM-xn-JP2
2
3
4
SPM-xn-JP3
1
2
SPM-xn-JP4
1
2
SPM-xn-JP5
 
CIR.x CP.xn 1
2
SPM-xn-JP6
 
CIR.x HT.xn 1
2
SPM-xn-JP2
1
CONNECTION POINT
Pin
EXV1-J1
— 11
12
EXV1-J4
1
—
2
3
EXV1-J3
 
CIR.A SGT.A
EXV1-J3
 
CIR.B SGT.B
EXV1-J2A
1

CIR.A EXV.A 2
3
4
EXV1-J2B
1

CIR.B EXV.B 2
3
4
6 7 8
6 7 8
Notation
24 vac
Ground
+
G
-
+
G
-
Notation
24 vac
Ground
+
G
–
THA
THB