4
Keston Combi -
Installation and Servicing
general
Table 1 - General Data
Note. Gas consumption is calculated using a
caloric value of 38.7 MJ/m
3
(1038 Btu/ft
3
) gross
or 34.9 MJ/m
3
(935 Btu/ft
3
) nett
To obtain the gas consumption at a different
caloric value:
a. For l/s - divide the gross heat input
(kW) by the gross C.V. of the gas (MJ/m
3
)
b. For ft
3
/h - divide the gross heat input (Btu/h)
by the gross C.V. of the gas (Btu/ft
3
)
c. For m
3
/h - multiply l/s by 3.6.
Key to symbols
PMS = Maximum operating pressure of water
C
13
C
53
= A room sealed appliance designed for connection via ducts to
a horizontal terminal, which admits fresh air to the burner and
discharges the products of combustion to the outside. The fan is
up stream of the combustion chamber.
I
2H
= An appliance designed for use on 2nd Family gas, Group H only.
* The value is used in the UK Government’s Standard Assessment Procedure (SAP) for energy rating of dwellings. The test data from
which it has been calculated have been certied by a notied body.
*Required for maximum ow rate. Boiler operates down to 2 l/min DHW delivery
** In areas of low water pressure the DHW restrictor can be removed
Keston Combi 30 35
Gas supply 2H - G20 - 20mbar
Gas Supply Connection 15mm copper compression
Injector Size (mm) 4.65 4.9
Inlet Connection DHW 15mm copper compression
Outlet Connection DHW 15mm copper compression
Flow Connection CH 22mm copper compression
Return Connection CH 22mm copper compression
Flue Terminal Diameter mm (in) 50 (nominal)
Average Flue Temp-Mass Flow Rate (DHW) 68
o
C - 13g/s 73ºC - 15g/s
Maximum Working Pressure (Sealed Systems) bar (lb/in
2
) 2.5 (36.3)
Maximum Domestic Hot Water Inlet Pressure bar (lb/in
2
) 10.0 (145)
Minimum Domestic Hot Water Inlet Pressure* bar (lb/in
2
) 1.3 (18.9) 1.3 (18.9)**
Electrical Supply 230 V ~ 50 Hz.
Power Consumption W 152 177
Fuse Rating External : 3A Internal : T4H HRC L250 V
Water content CH litre (gal) 1.2 (0.26)
DHW litre (gal) 0.5 (0.11)
Packaged Weight kg (lb) 37.8 (83.3) 38 (83.8)
Maximum Installation Weight kg (lb) 32.8 (72.3) 33 (72.8)
Boiler Casing Size Height mm (in) 700 (27.5)
Width mm (in) 395 (15.5)
Depth mm (in) 278 (11)
Table 2 - Performance Data - Central Heating
Table 3 - Performance Data - Domestic Hot Water
Boiler Input : Max. Min. 30 Min. 35
Boiler Input ‘Q’ Nett CV kW 24.3 6.1 7.1
(Btu/h) (82,900) (20,700) (24,100)
Gross CV kW 27.0 6.7 7.9
(Btu/h) (92,000) (23,000) (26,900)
Gas Consumption m
3
/h 2.512 0.623 0.734
(ft
3
/h) (89) (22) (25.9)
Boiler Output :
Non Condensing kW 24.2 6.1 7.1
70
o
C Mean Water temp. (Btu/h) (82,600) (20,700) (24,100)
Condensing kW 25.6 6.4 7.5
40
o
C Mean Water temp. (Btu/h) (87,400) (21,800) (25,500)
Seasonal efciency* SEDBUK 2005
SEDBUK 2009
91.1%
89%
91%
88.9%
NOx Classication CLASS 5
Maximum DHW Input : 30 35
Nett CV kW 30.4 35.4
(Btu/h) (103,600) (120,900)
Gross CV kW 33.7 39.3
(Btu/h) (115,000) (134,200)
Gas Consumption m
3
/h 3.135 3.658
(ft
3
/h) (111) (129)
Maximum kW 30.3 35.3
DHW Output (Btu/h) (103,300) (120,500)
DHW Flow Rate l/min 12.4 14.5
at 35°C temp. rise. (gpm) (2.8) (3.2)
DHW Specic Rate l/min 14.5 16.9
(gpm) (3.2) (3.7)
(54 pages)
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