Evo Heat Pump Manual Version 5
Page 13 of 84
Fig 4 Heat Pump with Underfloor and Multiple Manifolds Schematic
As an alternative to a buffer vessel it is possible to have some zones left
“
open
”
–
i.e. without electric
actuators. These zones will still require thermostats so can call for heat when required. In houses, the best
zones to chose are ensuite bathrooms, and hallways, neither of which are likely to be overheated.
If the
“
open
”
zone method is chosen, to avoid short cycling of the heat pump the smallest actuator
controlled zone (plus all the open zones on that manifold) should be capable of absorbing the minimum
thermal load of the heat pump. This minimum load is approximately 25% for single compressor heat
pumps.
Please Note : The above drawing is a schematic only and additional valves and fittings maybe required.
H
eat P
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mp
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ee
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arr
an
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ic
al s
et
to
ru
n
El
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tr
ic
al
in
stal
lati
o
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Me
ch
an
ic
al
in
stal
lati
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In
stal
lati
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G
en
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ral
p
ro
d
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ct
in
fo
rmatio
n
Safet
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in
fo
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In
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d
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cti
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n
Please note: A filling loop is required on
the ground and distribution side. Please
see recommended method in Section
4.6.5.vi Fig 18
Meter Ready Requirement.
Isolation values to reserve space
for flow meter and temperature
sensor in the return line and space
for a temperature sensor in the
flow line. See section 4.6.6.1
