Manual
EKC 315A Industrial Evaporator Controller
12
USCO.PD.RD0.A1.22 / 521U0092
© Danfoss USCO (HMR_MKS), 04-2008
Wiring diagram and terminal functions
Terminal
pairs
Description
1-2
Switch function for start-stop of regulation. When there
is no connections between terminals 1 & 2, the controller
will send a signal to close the valve.
If not using a switch,
terminals must be shorted with a jumper wire.
2-5
Current output that is used:
To control a motorized valve type ICM with ICAD
1.
motor actuator, or
For remote monitoring when the ICM/ICAD is not
2.
used (see parameter o09).
9-10
Optional relay output for control of a liquid line solenoid
valve. Control is based on thermostat setting. The relay
is closed on power failure.
12-13
Alarm relay. There is no connection between 12 and
13 during alarm conditions or when the controller is
not functioning.
14-15
Pressure transmitter, type AKS 33 or equivalent. Note:
controller powers the 4-20 mA loop (no additional
power source needed.
Terminal
pairs
Description
17-18
Signal from TQ (discontinued valve actuator. See
Appendix 1 for TQ wiring diagram).
18-19
Optional current input from PLC or other source,
for offsetting the thermostat setting or superheat
reference.
20-21
Temperature sensor S2 (PT 1000) at evaporator outlet
for superheat.
21-22
Temperature sensor S3 (PT 1000) for thermostat
function controlling a liquid line solenoid valve.
23-24
24 Vac output for control of pulse width modulated
valve type AKV/A (Maximum 20Ws coil). Can also be
used to power the discontinued type TQ valve (see
Appendix 1 for TQ wiring diagram.
25-26
Supply voltage 24 Vac. 80 VA maximum load
depending on valve
Green (-)
Brown (+)
24Vd.c.
Yellow (-)
Grey (+)
Solenoid
relay
Alarm
relay
Optional analog
input from PLC etc.
AKV or AKVA pulse-width
modulation expansion valve
Note: controller powers the
24Va.c., max 20W coil
Pressure transmitter,
type AKS 33
Motorized modulating valve, type
ICM/ICAD, must be supplied with
24Vd.c. from an external source.
80 VA max load
Note: Each EKC 315A controller can
control a type AKV/A valve or an ICM,
but not both simultaneously.
