Relay Test - Viessmann VITODENS 200 Start-Up And Service Instructions

Troubleshooting
Correction
(continued)
DIAGNOSIS/RELAYS
02: HEATING CIRCUIT PUMP A
02: <PL. 20> ON
>CONTINUE:................. A
>BACK:........................ B
>INSTALLER SETUP:...... C
42

Relay test

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" (see below).
Display
01 – 1st stage burner
<PL41> ON
02 – Heating circuit pump A
<PL20> ON
03 – Heating circuit pump B
<PL20B> ON
04 – DHW pump
<PL21> ON
05 – Not assigned
06 – Not assigned
07 – Mixing valve HC B
<PL52B> CLOSED
08 – Mixing valve HC B
<PL52B> OPEN
10 – Modulation
<PL90> CLOSED
Burner
<PL41> ON
11 – Modulation
<PL90> OPEN
Burner
<PL41> ON
13 – Additional heating pump
<PL28> ON
14 – Alarm output
<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)
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.
Meaning
Without function
(Burner on, pump not running)
Circulating pump
Heating circuit pump
with extension kit with mixing valve
DHW heating pump
*1
Mixing valve CLOSED
*1
Mixing valve OPEN
Burner (min. input)
Circulating pump
Burner (max. input)
Circulating pump
Additional heating pump or
*2
DHW recirculation pump
*3
Alarm output