3
3
3.3 CoMBi He & CoMBiPaC He - teCHniCal Details
21
Heat Output
kW
12-20
20-26
26-35
COnneCtiOns
-
-
-
Heating Flow
22 mm dia.
22 mm dia.
28 mm dia.
Heating Return
22 mm dia.
22 mm dia.
28 mm dia.
Mains Cold Feed (Copper)
15 mm dia.
15 mm dia.
15 mm dia.
Hot Water Delivery (Copper)
15 mm dia.
15 mm dia.
15 mm dia.
Drain Off Valve
½” BSP
½” BSP
½” BSP
Safety Pressure Valve Outlet (Copper)
15 mm dia.
15 mm dia.
15 mm dia.
Condensate Trap
22 mm dia. plastic pipe
22 mm dia. plastic pipe
22 mm dia. plastic pipe
CirCulating pump
UPM 3
UPM 3
UPM 3
Domestic Hot Water Plate Heat Exchanger
25 plate
25 plate
25 plate
Integral Expansion Vessel Normal Capacity
12 litres
12 litres
12 litres
Expansion Vessel Pre-charge Pressure
1 bar
1 bar
1 bar
Low Pressure Water Switch?
✔
✔
✔
Filling Loop Included?
✔
✔
✔
Water COntent
-
-
-
Boiler
24 litres
24 litres
24 litres
Primary Tank
20 litres
20 litres
20 litres
D.H.W. guiDe perfOrmanCe*
-
-
-
in litres/min (120 litre draw-off at 40˚C ∆t.)
16
16
20
flue (inDOOr BOilers)
-
-
-
Balanced Flue Assembly
125 (5”) mm dia.
125 (5”) mm dia.
125 (5”) mm dia.
Max. Low Level Flue Length
1.5m
1.5m
1.5m
Max. High Level Balanced Flue Length
6m
6m
6m
Heating system (sealeD)
Fit in accordance with BS 7074 Part 1, BS 5449, OFTEC standards and all other relevant legislation.
Max. Operating Pressure
2 bar
2 bar
2 bar
Max. System Pressure Cold
1.5 bar
1.5 bar
1.5 bar
Min. System Pressure Cold
0.5 bar
0.5 bar
0.5 bar
Preset Pressure Relief Valve
3 bar
3 bar
3 bar
mains Water supply pressure
Min. 3 bar - Max. 5 bar (for user comfort, we recommend pressure at tap to be between 2 and 3 bar).
Limescale excess: When over 150/200 ppm, fit appropriate scale reducer/water softener.
Water siDe resistanCe
flow rate to give a nominal Output at 10K Differential
12-20kW
20-26kW
26-35kW
Flow Rate Measured
1642 kg/h
2135 kg/h
2874 kg/h
Waterside Resistance
0.18 mbar 0.18 mbar 0.18 mbar
flow rate to give a nominal Output at 20K Differential
Flow Rate Measured
870 kg/h
1131 kg/h
1523 kg/h
Waterside Resistance
0.19 mbar 0.19 mbar 0.19 mbar
* where water demand exceeds this, a flow restrictor is recommended. This will ensure a water supply at an adequate temperature.
teCHniCal sPeCiFiCation
