Boiler specification, Boiler design – Glow-worm Betacom C User Manual

Page 8

Boiler

Specification

Boiler Design

These boilers are designed for use as part of a sealed water

central heating system with fully pumped circulation. The

pump, expansion vessel and associated safety devices are all

fitted within the boiler.

BOILER SPECIFICATION

24c

30c

Lift weight

37 kg (82 Ib)

38 kg (84 Ib)

Total weight (installed)

40 kg (88 Ib)

41 kg (90 Ib)

Gas connection Ø O.D.

22mm. copper

Heating flow and return connection Ø O.D.

22mm. copper

Domestic hot water connection Ø O.D.

15mm. copper

Condensate connection Ø I.D.

21.5mm. plastic

Safety valve discharge connection Ø O.D.

15mm. copper

Heating circuit safety valve (preset)

3.5 bar (53.5 Ibf/in2)

Heating system minimum pressure

0.8 bar (11.6 Ibf/in2)

0.8 bar (11.6Ibf/in2)

Heating system nominal pressure

1.5 bar (21.7 Ibf/in2)

Maximum domestic water supply pressure

8 bar (116 Ibf/in2)

Minimum domestic water supply pressure

0.25 bar (3.6 Ibf/in2)

Maximum domestic hot water temperature

64ºC

Maximum central heating temperature

85ºC

Maximum domestic hot water output at 35

o Δ T

9.4

L/min.

10.5

L/min.

Expansion vessel capacity

7 litres (1.53 gallons)

8 litres (1.76 gallons)

Expansion vessel pre-charge pressure

1.0bar (14.6 Ibf/in2)

Minimum flow rate around the

776 L/hr.

1032 L/hr.

central heating circuit at 35 rise
Electrical supply

230V~50Hz fused 5A

Maximum power comsumption

220 Watt

EN60529 IP clasification

IPX4D

Internal fuse rating on main PCB

Gas supply (governed meter only - NG)*

G20 - NG /G31 - Propane

G20 - NG /G31- Propane

Gas category

2H3P

Inlet gas working pressure - NG

20 mbar

Heat input maximum

25.7 kW.

28.5 kW.

Heat output maximum

24.7 kW.

27.6 kW.

Heat input minimum

11 kW.

Heat output minimum

10.2 kW.

Usefull efficiency at 100% load

96%

96.8%

Usefull efficiency at 30% load

102.4%

103.3%

Burner injector NG / LPG (G31)

1.20 mm / 0.75mm

1.15 mm / 0.75mm

Burner pressure maximum NG**

12.5 mbar

14 mbar

Burner pressure minimum NG

2.5 mbar

2.3 mbar

SEDBUK rating

Band B 86.0%

Band 86.4%

NOx

Class 3

Flue Type

C12-C32-C42-C52

* See Commissioning section for NG (G20) to LPG (G31) conversion

** Installation to (G31) Propane is by conversion kit only

The appliance has a built in frost protection device that

protects the boiler from freezing.

Once the controls are set the boiler operates automatically.