Water Circulation Pump Characteristics - Mitsubishi Electric ecodan ERST20 series Installationshandbuch

4
installation

Water Circulation Pump Characteristics

1. Primary circuit
Pump speed can be selected by main remote controller setting (see <Figure 4.3.5 to
4.3.7> ).
Adjust the pump speed setting so that the flow rate in the primary circuit is
appropriate for the outdoor unit installed (see Table 4.3.1). It may be necessary to
add an additional pump to the system depending on the length and lift of the
primary circuit.
For outdoor unit model not listed in the <Table 4.3.1>, refer to Water flow rate
range in the specification table of outdoor unit Data Book. In such case, make sure
that the flow rate is greater than 7.1 L/min and less than 27.7 L/min.
<Second pump >
If a second pump is required for the installation please read the following carefully.
If a second pump is used in the system it can be positioned in 2 ways.
The position of the pump influences which terminal of the FTC the signal cable
should be wired to. If the additional pump(s) have current greater than 1A please
use appropriate relay. Pump signal cable can either be wired to TBO.1 1-2 or
CNP1 but not both.
Option 1 (Space heating/cooling only)
If the second pump is being used for the heating circuit only then the signal cable
should be wired to TBO.1 terminals 3 and 4 (OUT2). In this position the pump can
be run at a different speed to the cylinder unit's in-built pump.
Option 2 (Primary circuit DHW and space heating/cooling)
If the second pump is being used in the primary circuit between the cylinder unit
and the outdoor unit (Package system ONLY) then the signal cable should be
wired to TBO.1 terminals 1 and 2 (OUT1). In this position the pump speed MUSt
match the speed of the cylinder unit's in-built pump.
note: refer to 5.2 Connecting inputs/outputs.
Water circulation pump characteristics
e*St20C series
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0 5.0 10.0 15.0
Flow rate [L/min]
<Figure 4.3.5>
eHPt20X series
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0 5.0 10.0 15.0
Flow rate [L/min]
<Figure 4.3.7>
* For installation of eHPt20 series, set its pump speed with a pressure drop between the cylinder unit and the outdoor unit factored into the external static pressure.
15
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
20.0 25.0 30.0 35.0 40.0
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
20.0 25.0 30.0 35.0 40.0
Outdoor heat pump unit
Packaged model PUHZ-W50
PUHZ-W85
PUHZ-W112
PUHZ-HW112
PUHZ-HW140
Split model SUHZ-SW45
PUHZ-SW40
PUHZ-SW50
PUHZ-FRP71
PUHZ-SW75
PUHZ-SW100
PUHZ-SW120
PUHZ-SHW80
PUHZ-SHW112
PUHZ-SHW140
PUMY-P112
PUMY-P125
PUMY-P140
<Table 4.3.1>
* If the water flow rate is less than 7.1 L/min, the flow rate error will be activated.
If the water flow rate exceeds 27.7 L/min, the flow speed will be greater than 1.5
m/s, which could erode the pipes.
2. Sanitary circuit
Default setting: Speed 2
DHW circulation pump MUST be set to speed 2.
e*St20d series
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0 5.0 10.0 15.0
Water flow rate range [l/min]
7.1-14.3
10.0-25.8
14.4-27.7
14.4-27.7
17.9-27.7
7.1-12.9
7.1-11.8
7.1-17.2
11.5-22.9
10.2-22.9
14.4-27.7
20.1-27.7
10.2-22.9
14.4-27.7
17.9-27.7
17.9-27.7
17.9-27.7
17.9-27.7
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
20.0 25.0 30.0 35.0
Flow rate [L/min]
<Figure 4.3.6>
40.0