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Gross heat input (kW)
Net heat input, Q (kW)
Heat output, P
Non condensing (kW)
Heat output
Condensing mode (kW)
Burner CO
(%) at maximum rate
2
+0.3, -0.5
Approximate Gas rate (m
- After 10min from cold
Off-set pressure at minimum rating (mbar)
Minimum water flow rate (m
3.3.
GAS SUPPLY
(a) The Local Gas Supplier should be consulted at the installation planning stage in order to establish the
availability of an adequate supply of gas.
(b) An existing service pipe MUST NOT be used without prior consultations with the gas supplier.
(c)
A gas meter can only be connected by the Local Gas Supplier or by his Contractor.
(d) An existing meter should be of sufficient size to carryout the maximum boiler input plus the demand of
any other installed gas appliance, (BS 6891:1988). The supply from governed meter must provide
steady inlet working pressure of 20mbar (8in wg) at the boiler. See section Technical Data for the gas
required for each specific model.
(e) The gas supply line must be purged. WARNING: before purging open all doors and windows and also
extinguish any cigarettes, pipes and any other naked lights.
(f)
The complete gas installation must be tested.
3.4.
ELECTRICITY SUPPLY
(a) The boiler must be permanently connected to a 230V~, 50Hz supply. This appliance MUST BE
EARTHED.
(b) All external wiring to the boiler must be in accordance with the latest I.E.E. Wiring Regulation, and any
local regulations, which may apply.
(c) There must be only one common isolator for the boiler and its control system, and it must provide
complete electrical isolation via a double pole isolator fused at 3A maximum with a contact separation of
at least 3mm in both poles.
(d) The fused spur box should be readily accessible and preferably adjacent to the appliance and it should
be identified as to its use.
(e) Alternatively the connection can be made through an unswitched shuttered socket and 3A fused 3-pin
plug both to the current issue of BS 1363 may be used, provided they are not used in a room containing
bath or shower.
(f) In the event of an electrical fault after installation of the appliance, preliminary electrical checks must be
carried out i.e. Earth Continuity, Short Circuit, Polarity, and Resistance to Earth.
VER: 02.3 _260505
Supplied By www.heating spares.co Tel. 0161 620 6677
Table 3.2. Thermal, combustion and gas data
Rating
GB30
Maximum
Minimum
Maximum
Minimum
Maximum
Maximum
Minimum
Case off
Case on
3
/h)
Maximum
3
/h)
Boiler Model
GB25
GB20
34.2
28.3
22.6
10.0
8.5
6.8
30.8
25.5
20.4
9.0
7.7
6.1
30.2
25.0
20.0
32.0
27.2
22.0
9.8
8.4
6.6
9.6
9.6
9.6
9.8
9.8
9.8
3.3
2.7
2.2
- 8.0
- 10.0
-10.0
1.37
1.17
0.94
GB15
GB10
17.0
11.3
5.1
4.6
15.3
10.2
4.6
4.1
15.0
10
16.4
10.9
4.9
4.5
9.7
9.6
9.9
9.8
1.6
1.1
-10.0
-9.0
0.70
0.48
Page:11/41
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