3
Natural Gas and Propane versions
Appliance VBX30 VBX18
Total weight (full) kg 38.1 32.6
Total weight (empty) kg 36.1 31.3
Max lift weight kg 28.1 24.7
Total water capacity l 2.0 1.3
Electrical supply 230V 50Hz Fuse at 3A
Internal fuse T4H 4A 250V
Maximum power consumption W 110
IP Rating XXXX
Flue gas temperature Nat Gas 80/60(Propane) °C 73 (76) 74 (72)
Flue gas temperature Nat Gas 50/30 41 43
CO
2
value max rate (Nat Gas) %
9.2 ± 0.3 case on
9.0 ± 0.2 case off
CO
2
value min rate (Nat Gas) ref only % 8.9 ± 0.1 8.4 ± 0.1
CO value max rate (Nat Gas) % 0.01 ± 0.005
CO
2
value max rate (Propane) %
10.7 ± 0.3 case on
10.5 ± 0.2 case off
CO
2
value min rate (Propane) ref only % 10.0± 0.1 9.7 ± 0.1
CO value max rate (Propane) % 0.019 ± 0.005
Flue products mass flow rate (Nat Gas) g/s 13.7 8.3
Flue products mass flow rate (Propane) g/s 13.7 8.3
Gas Valve Offset @ min rate Pa -3.0
Connections
Gas 15 mm compression
CH flow 22 mm tail
CH return 22 mm tail
Condensate Drain 21.5 - 22 mm plastic overflow pipe
2.3
GENERAL SPECIFICATIONS
34
Refer to Figure 49.
Key G C Part No. Description No off Makers Pt No.
1 Ignition Electrode 500680
2 Detection Electrode 500681
3 Spark Generator Unit 500665
4 Gas Control Valve 500655
5 Fan Assembly 601015
6a Burner VBX 30/SBX 30 700602
6b Burner VBX 18/CBX 24 700600
7a Heat Exchanger (VBX 30) 451033
7b Heat Exchanger (VBX 18) 451034
8Water Temperature Sensor 500661
9Flue Sensor 500660
10 Manual Bleed Valve 300730
11 Control PCB 988491
12 User Interface 988492
Heat Exchanger Seal Kit 988489
SHORT PARTS LIST
10
49
123 4
5678
9
10
11
12