Technical data

www.dimplex.de 01.2012 | Project planning manual for heat pumps for heating and domestic hot water preparation | 97
Integration of the heat pump in the heating system 8.4
8.3.5 Dual differential pressureless manifold
In a heat pump, the dual differential pressureless manifold is a
useful alternative to the buffer tank connected in parallel, since it
fulfills the same function without compromising when it comes to
efficiency. The hydraulic isolation is realised using two manifolds
without differential pressure with a check valve each (see
Fig. 8.41 on page 120).
Advantages of the dual manifold without differential pressure:
 Hydraulic isolation of the generator circuit and the consumer
circuit
 Operation of the circulating pump (M16) in the generator cir-
cuit with the compressor in heating operation only, to avoid
unnecessary operation
 Possibility for a joint use of the buffer tank connected in se-
ries by the heat pump and the additional heat generator
 Protection of the heat pump against too high temperatures
when external energy is fed into the buffer tank connected in
series
 Guarantee of the minimum compressor runtimes and de-
frosting in all possible operating conditions through full circu-
lation of the buffer tank connected in series
 Interruption of the heating operation for the domestic hot
water and swimming pool water preparation so that the heat
pump is always operated with the lowest possible tempera-
ture level.
NOTE
The hydraulic integration via a dual differential pressureless manifold of-
fers maximum flexibility, operational safety and efficiency.
8.4 Domestic hot water distribution system
The domestic hot water distribution system consists of perfectly
matched individual components which can be combined accord-
ing to individual requirements. The maximum permissible heat-
ing water flow rate of each component must be taken into ac-
count during the dimensioning.
Connecting the buffer tank and ensuring the
heating water flow rate
 Compact manifold
KPV 25 (recommended up to 1.3m
3
/h)
 Extension module for the manifold without differential pres-
sure EB KPV (recommended for up to 2.0m
3
/h)
 Dual differential pressureless manifold
DDV 25 (recommended up to 2.0m³/h)
DDV 32 (recommended up to 2.5m
3
/h)
DDV 50 (recommended up to 7.5 m³/h)
Heating distribution system modules
 Unmixed heating circuit module
WWM 25 (recommended up to 2.5 m³/h)
WWM 50 (recommended up to 8.0 m³/h)
 Mixed heating circuit module
MMH 25 (recommended up to 2.0 m³/h)
MMH 50 (recommended up to 8.0 m³/h)
 Manifold bar for connecting two heating circuits
VTB 25 (recommended up to 2.5m
3
/h)
Domestic hot water preparation distribution
system modules
 Domestic hot water module
WWM 25 (recommended up to 2.5m
3
/h)
Manifold bar for connecting KPV 25 and WWM 25
VTB 25 (recommended up to 2.5m
3
/h)
 Domestic hot water pump assembly WPG 25 or 32 for direct
connection of the domestic hot water circulating pump on
the domestic hot water cylinder (see Fig. 8.36 on page 117)
Extension modules for the distribution system
 Mixer module for bivalent systems
MMB 25 (recommended for up to 2.0m
3
/h)
 Solar station for domestic hot water
SST 25
NOTE
The components of the domestic hot water distribution system are shown
in the integration diagrams in Chapt. 8.14 on page 112dashed lines.