Viessmann Vitodens 200, Service Instructions Manual

Page: 42 / 116

42
Troubleshooting
Repairs
(cont.)
Relay test
(for Comfortrol programming unit)
Open flap:
Menu item Key
³ SYSTEM " D "
³ INSTALLER SETUP " C "
³ CODE PLEASE " B Ć C Ć C Ć B "
³ DIAGNOSIS " A "
³ RELAY TEST " A "
You can select the required relay
with menu item "CONTINUE"Ă" A "
and check its function.
Please note:
The programming unit must be
plugged into the control unit before a
relay test can be carried out.
Relays which have not been
mentioned are not relevant.
The burner stays off during the relay
test, if there is no heat demand.
Display Meaning
01 ć Burner 1
st
Ăstage N/A
<ST41> ON
02 ć Heating circuit pumpĂA Circulation pump
<ST20> ON
03 ć Heating circuit pumpĂB Heating circuit pump
<ST20B> ON for extension kit with mixer
04 ć Cylinder loading pump Three-way valve (DHW cyl. loading)
<ST21> ON
07 ć Mixer HCĂB Mixer closed
*1
<ST52B> CLOSED
08 ć Mixer HCĂB Mixer open
*1
<ST52B> OPEN
10 ć Modulation Burner (lower output)
<ST90> CLOSED Circulation pump
Burner
<ST41> ON
11 ć Modulation burner (upper output)
<ST90> OPEN Circulation pump
Burner
<ST41> ON
13 ć DHW circulation pump DHW circulation pump
*2
<ST28> ON
14 ć Central fault message Central fault message
*2
<ST50> ON
*1
Only with mixer extension kit, part no.Ă7450Ă058.
*2
Only with the connection extension, part no. 7404Ć582.
5692Ă485
G
B