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Millbrook House, Grange Drive, Hedge End, Southampton, SO30 2DF
0844 879 3587
dimplex.co.uk | gdcgroup.co.uk
22
4.1.1 Pipe Sizing Information
When selecting piping to install w ith the heat p ump please ensure that:
•
• The safety group and expansion vessel (space heating side) are accurately sized by the installer
based on the system volume (these are not supplied by Dimplex).
• External pipework and valves should be adequately insulated with vapour resistant insulation and
protected against damage to prevent excessive heat losses. All joints should be suitably sealed
and exposed pipework must be avoided.
• Ensure the water out and water in pipes are positioned correctly for connection to the heat pump
NOTE: The hydraulic installation information provided in this manual applies only to the components
provided in the Glen Dimplex hydraulics pack (see Scope of Delivery for information).
A8M A12M / A16M
Space heating only
DHW with
A-Class cylinder
Water ow rate
@ 1100 l/h
(nominal)
@ 2100 l/h
(nominal)
@ 1800 l/h
(nominal)
Associated head available 60kPa 14kPa 18kPa
Pipe diameter
(mm)
Internal diameter
(mm)
Maximum equivalent pipe length
90 N/A N/A
300 23 38
22
28
32
19.8
25.6
29.6
0.31 l/m
0.51 l/m
0.69 l/m 600 46 77
Table 1: Maximum equivalent length for copper pipe - water only
CAUTION: Table 1 above is provided as a guideline when using water only. Any percentage of anti-freeze
added will affect the pressure drop of the system greatly and will render this table invalid.
Not all types of pipe will have the same internal diameter, e.g. multi-layered/plastic pipes will have
a thicker wall so the guidelines set out in table 1 will not apply. Microbore (8mm) and 15mm pipe is
not suitable.
As a rule of thumb, the equivalent straight length (L [mm]) of each elbow is found by multiplying
the outer diameter of the pipe (D [mm]) by 30, e.g. 4 elbows of diameter 22mm pipe is equivalent to
2.5m of 22mm pipe.
Volume of
water per
metre of pipe
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