Checking The Neutralising System (If Installed); Checking The Flow Limiter (Only For Gas Condensing Combi Boiler) - Viessmann B1HF Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Installing the burner
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.

Checking the neutralising system (if installed)

Checking the flow limiter (only for gas condensing combi boiler)

Fig. 38
52
(cont.)
4.
3.
A
2.
4. Connect the cables/leads:
■ Fan motor A (2 plugs)
■ Ionisation electrode
Ignition unit
■ C
■ Earth D
1. Drain the boiler on the DHW side.
2. Remove the spring clip.
3. Remove the DHW flow sensor.
4. Check flow limiter . Replace in case of exces-
A
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.
B