8
EN2R--9023 9705R0--NE
Table 3. Connections for A4021A pre-- and post configuration with contact ratings
Terminal
No
Abbreviations
Direction
Description
Ratings
(220
240Vac/100
120Vac
No.
pre
post
(220 ... 240Vac/100 ... 120Vac,
depending on O.S. number)
1
NO
NO
input
Normally Open contact of the pressure
switch (high pressure)
n.a.
2
RESET
RESET
input
Input for external reset connect with
momentary switch to line
n.a.
3
LINE
LINE
power--input Line voltage input for valve proving
system.
n.a.
4
N
N
power--input Neutral input for valve proving system.
n.a.
5
N
N
power
Neutral for external devices.
n.a.
6
N
N
power
Neutral for external devices.
n.a.
7
V2--IN
V2--IN
input
Valve--2 voltage from ignition controller
n.a.
8
V2--OUT
V2--OUT
output
Output connect with Valve--2
4A
9
HD
LGPS
input
Heat--demand input (pre--configuration)
or LGPS input (post--configuration)
n.a.
10
ALARM
ALARM
input
Alarm input
4A
11
ALARM
ALARM
output
Alarm output
2A
12
RB
RB
input
Read back signal for: heat--demand
(post-- config.) ign. contr. (pre--config.)
4A
13
VENT
VENT
output
Normally open valve output
1A
14
IGNCTR
HD
output
Heat call signal to ignition controller,
when there is a heat call and the valve
proving has taken place
4A
15
V1--IN
V1--IN
input
Valve--1 voltage from ignition controller
2A
16
V1--OUT
V1--OUT
output
Output connect with Valve--1
4A
NOTE:
cos.
ϕ
= 0.7 for all outputs