Viessmann B1HF - Checking the Flow Limiter (Only for Gas Condensing Combi Boiler); Checking the Neutralising System (if Installed)

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3. Check the gas connections for leaks.
Danger
Escaping gas leads to a risk of explosion.
Check all fittings for gas tightness. In the
case of wall mounted appliances, also check
the gas shut-off valve fitting on the under-
side.
4. Connect the cables/leads:
■
Fan motor
A
(2 plugs)
■
Ionisation electrode
B
■
Ignition unit
C
■
Earth
D
Checking the neutralising system (if installed)
Checking the flow limiter (only for gas condensing combi boiler)
A
2.
4.
3.
Fig. 38
1. Drain the boiler on the DHW side.
2. Remove the spring clip.
3. Remove the DHW flow sensor.
4.
Check flow limiter
A
. Replace in case of exces-
sive scaling or damage. Reinsert.
5. Mount DHW flow sensor with new gaskets.
Danger
Risk of electric shock from escaping heating
water or DHW.
Check all water side connections for tight-
ness.
Commissioning, inspection, maintenance
Installing the burner (cont.)
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