Installation manual

12
3 Installation
3.1 Plumbing Information
3.1.1 P IPE S IZING I NFORMATION
When selecting piping to install with the heat pump please ensure that:
• The pipe sizes are adequate to allow the correct nominal water flow rate through the heat pump.
• 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.
• Existing hot water systems should be flushed prior to connection to the heat pump to remove all contaminants and
impurities, in accordance with the latest version of MIS3005. Ensure the water out and water in pipes are positioned
correctly for connection to the heat pump as shown on the label in figure 1(a) and on the back of the heat pump in
figure 4.
• Isolation valves (non-return valve and ball valve with strainer), supplied in the Dimplex heat pump hydraulics pack,
allow the strainer to be removed and cleaned without having to drain the system. Installation of these valves is
discussed in greater detail in section 3.2.
• If multiple heat emitter circuits are installed, operating at different flow and return temperatures (such as under floor
heating and standard radiators), a mixing valve must be used on low temperature circuits to prevent high
temperature water from entering the under floor heating manifold.
Table 1 shows guidelines for the maximum length of pipe allowed to achieve nominal flow rates, depending on pipe
diameter. This table is only valid when using the pump supplied in the Dimplex hydraulic kit (see pages 2-4).
A8M
Space Heating Only Space Heating Only DHW with A-Class Cylinder
Water Flow Rate @ 1100 l/h (nominal) @ 2100 l/h (nominal) @ 1800 l/h (typical)
Associated Head
Available
60kPa 14 kPa 18kPa
Pipe
Diameter
(mm)
Internal Diameter
(mm)
Maximum Equivalent Length (m)
~
22* 19.8 90 7 11
28^ 25.6 300 23 38
32^ 29.6 600 46 77
A12M / A16M
15* 12.0 8 N/A N/A
*Only suitable for special conditions ^Recommended pipe diameter for A12M/A16M
~
Assuming straight length with no incidents
(e.g. elbows, tees)
Table 1: Maximum Equivalent Length for Copper Pipe - Water ONLY
NOTE: T HE HYDRAULIC INSTALLATION INFORMATION PROVIDED IN THIS MANUAL APPLIES ONLY TO THE
COMPONENTS PROVIDED IN THE G LEN D IMPLEX HYDRAULICS PACK ( SEE PAGES 2-4 FOR PACK INFORMATION ).