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Viessmann WB2-44 - Relay Test

Viessmann WB2-44
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Troubleshooting
42
Correction (continued)
Relay test
DIAGNOSIS/RELAYS
02: HEATING CIRCUIT PUMP A
02: <PL. 20> ON
>CONTINUE:................. A
>BACK:........................ B
>INSTALLER SETUP:...... C
Open cover:
Menu option Button
SYSTEM D
INSTALLER SETUP C
CODE PLEASE: B-C-C-B
DIAGNOSIS A
RELAY TEST A
Select required relay to check its
function with the menu option
CONTINUE A”(seebelow).
Please note:
Those relays which are not
mentioned have no significance.
When the relay is selected, only the
corresponding unit is addressed. If no
call for heat is present, the burner is
omitted from the relay test.
For installations with Dekamatik-HK
mixing valve control, refer to the
Dekamatik-HK control manual.
Display Meaning
01 1st stage burner Without function
<PL41> ON (Burner on, pump not running)
02 Heating circuit pump A Circulating pump
<PL20> ON
03 Heating circuit pump B Heating circuit pump
<PL20B> ON with extension kit with mixing valve
04 DHW pump DHW heating pump
<PL21> ON
05 Not assigned
06 Not assigned
07 Mixing valve HC B Mixing valve CLOSED
*1
<PL52B> CLOSED
08 Mixing valve HC B Mixing valve OPEN
*1
<PL52B> OPEN
10 Modulation Burner (min. input)
<PL90> CLOSED Circulating pump
Burner
<PL41> ON
11 Modulation Burner (max. input)
<PL90> OPEN Circulating pump
Burner
<PL41> ON
13 Additional heating pump Additional heating pump or
<PL28> ON DHW recirculation pump
*2
14 Alarm output Alarm output
*3
<PL56> ON
*1
Only in conjunction with mixing valve extension kit
*2
If no low-loss header is installed, pump will be operated as a DHW recirculating pump
(see coding addresses “099” and “0B8”).
If a low-loss header is installed, the pump will operate as a boiler pump
(see coding address “0B8”).
*3
Only in conjunction with expansion board (optional)
5285 961 v1.35285 961 v1.3

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