Water Circulation Pump Characteristics; Immersion Heater - Mitsubishi Electric EHST20C-VM6HB Installationshandbuch

4
installation

Water Circulation Pump Characteristics

Pump speed can be selected by main controller setting (see <Figure 4.3.2 to
4.3.5> ).
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.
<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 FTC4 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 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)
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
EHST20 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 4.3.2>
EHPT20 series (with PUHZ-W85)
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 4.3.4>
* 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.

immersion heater

When an immersion heater is fitted, do NOT energise the heater until the DHW tank is full of water. Also do NOT energise any immersion heater if any sterilisation chemicals
remain in the DHW tank as this will cause premature failure of the heater.
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
20.0 25.0 30.0 35.0
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
20.0 25.0 30.0 35.0
Outdoor heat pump unit
Packaged PUHZ-W50
PUHZ-W85
PUHZ-HW112
PUHZ-HW140
Split PUHZ-RP35
PUHZ-RP50
PUHZ-RP60
PUHZ-(H)RP71
PUHZ-(H)RP100
PUHZ-(H)RP125
PUHZ-RP140
PUHZ-SW40
PUHZ-SW50
PUHZ-SW75
PUHZ-SW100
PUHZ-SW120
PUHZ-SHW80
PUHZ-SHW112
PUHZ-SHW140
SUHZ-SW45
<Table 4.3.1>
* If the water flow rate is less than 7.1 L/min, the flow switch 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.
EHPT20 series (with PUHZ-W50)
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0 5.0 10.0
EHPT20 series (with PUHZ-HW112/140)
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
0.0 5.0 10.0
Water flow rate range [l/min]
7.1 - 14.3
10.0 - 25.8
14.4 - 27.7
17.9 - 27.7
7.1 - 11.8
7.1 - 17.2
8.6 - 20.1
10.2 - 22.9
14.4 - 27.7
17.9 - 27.7
20.1 - 27.7
7.1 - 11.8
7.1 - 17.2
10.2 - 22.9
14.4 - 27.7
20.1 - 27.7
10.2 - 22.9
14.4 - 27.7
17.9 - 27.7
7.1 - 12.9
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
15.0 20.0 25.0 30.0
Flow rate [L/min]
<Figure 4.3.3>
Speed 5 (Default setting)
Speed 4
Speed 3
Speed 2
Speed 1
15.0 20.0 25.0 30.0
Flow rate [L/min]
<Figure 4.3.5>
35.0
35.0
14