Carrier HS070-160 - Manual (Page 25)

EXV Driver Module (Fig. 16.)
Input on strip am-c
When 24 are applied 2 terminals in a
channel it is read as an ON signal. is read as
an OFF signal.
Two stepper motor driver outputs used to
drive the electronic expansion valves, Terminals I and 7
supply voltage to the valves. Terminals 2 through 5 and
through I connect the individual coils (4 per valve) to
neutral in a repeating sequence to drive the valves in
incremental steps.
S E N S O R B U S C O N N E C T O R
RED STATUS LIGHT
C O M M U N I C A T I O N
STEPPER
MOTOR 2
J4
STEPPER
MOTOR I
G R O U N D ( C )
Display Module (HSIO) (Fig.
function of the HSIO is to allow the operator
with the processor. It is used to enter
and set points and to read data, perform tests and
set
Fig. 17 Keyboard/Display Module
COIL 4
COIL 4
3
2
I
C O M M O N
A D D R E S S A D J U S T M E N T
ON UNDERSIDE
Fig. 16 EXV Driver Module (DSIO)
2 5