Electronic Expansion Valve (Exv) Board - Carrier AQUAFORCE 30XW150-400 Operation & Service Manual

Electronic Expansion Valve (EXV) Board —
The 30XW150-325 units have one EXV board. The
30XW350,400 units have one EXV board per circuit. See
Fig. 10. The board is responsible for monitoring the suction gas
temperature and economizer gas temperature thermistors. The
board also signals the main EXV and economizer EXV
(ECEXV) motors to open or close. The electronic expansion
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 infor-
mation. See Tables 6 and 7 for EXV inputs and outputs.
DIP
SWITCH
L2
R2
C49
Q5 Q4
C25
C39 C37
U1
L1
U6
D15
257-01
D29
D9 D8
SI0
STATUS
(LEN)
Q2 Q1
L4
U5
U4
D5
C16
C15
Fig. 10 — EXV Board
EXV BOARD 1
(150-400)
DIP SWITCH
Address:
EXV BOARD 2
(350,400)
DIP SWITCH
Address:
COMM J4
3 2 1
G +
-
R3 L3
D1
712
D2
U2
Q7
S1
C10
Q12
Q10
Q17
Q15
Q20
Q22
Q30 Q27 Q25
Q37 Q42
G2
Q35
+
C17
D6
D4
MOV1
J1
24VAC
12/11
13
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
LOCATION OF
SERIAL NUMBER
Q45
a30-4216
6 7 8
6 7 8