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9 SYSTEM PUMP SELECTION & OPERATING LIMITS
9.1
System Pump Selection
We offer two pump selections which will need to be confirmed on ordering the heat pump as this pump is fitted within
the heat pump housing and wired up to the heat pump control panel. The selections of pumps are the
“modulating”
model (standard supply) or
a “high head” model (additional option).
The design of the system pump is to transfer the system water from the heat pump to a buffer vessel.
9.1.1
M
ODULATING
P
UMP
–
S
TANDARD
S
UPPLY
The below graph shows the remaining head available after pumping through the heat pump plate heat exchanger for
the primary pipework to the buffer vessel and the buffer vessel itself.
It does not include the pressure drop of the DHW 3 port valve
– refer to the DHW 3 port valve pressure drop graph
shown in chapter 6.2 and add the resistance to the calculations.
This graph is refered to the unit operating with a temperature at 10c (Density 1000 kg/m3)
Example - S-ASX 40 at 45c flow temperature at 7c air temperature:
-
Flow rate = 7,716 l/h
-
Pump head available = Approx. 30 kPa
-
Pressure drop through DHW 3 port valve = Approx. 3 kPa
-
Total available head for system at 7,716 l/h = 27 kPa.
9.1.2
H
IGH
H
EAD
P
UMP
–
A
DDITIONAL
O
PTION
The following graph shows the remaining head available after pumping through the heat pump plate heat exchanger
for the primary pipework to the buffer vessel and the buffer vessel itself.
It does not include the pressure drop of the DHW 3 port valve
– refer to the DHW 3 port valve pressure drop graph
shown in chapter 6.2 and add the resistance to the calculations.
Summary of Contents for S-ASX 30
Page 2: ...2 ...
Page 24: ...24 10 CORRECTIVE FACTORS 10 1 Heating Performances ...
