Safety Device Connections; Electrical Connection - Mitsubishi Electric ecodan ERSE series Installationshandbuch

4
Installation

Safety Device Connections

The hydrobox contains a pressure relief valve. (see <Figure 4.3.7>) The con-
nection size is G1/2" female. The installer MUST connect appropriate discharge
pipework from this valve in accordance with local and national regulations.
Failure to do so will result in discharge from the pressure relief valve directly into
the hydrobox and cause serious damage to the product.
All pipework used should be capable of withstanding discharge of hot water.
Relief valves should NOT be used for any other purpose, and their discharges
should terminate in a safe and appropriate manner in accordance with local regu-
lation requirements.
Note: Beware that the manometer and the pressure relief valve are NOT
strained on its capillary side and on its inlet side respectively.
If a pressure relief valve is added, it is essential that no check valve
or isolation valve is fitted between the hydrobox connection and the
added pressure relief valve (safety matter).
Piping diagram for 2-zone temperature control
Connect the pipe work and locally supplied parts according to the relevant circuit
diagram shown in Section 3. Technical Information, of this manual.
For more details on wiring, refer to "5.3 Wiring for 2-zone temperature controls".
Note: Do not install the thermistors on the mixing tank. This could affect
correct monitoring of flow and return temperatures through each
zone.
Install the Zone2 flow temp. thermistor (THW8) near the mixing valve.

4.4 Electrical Connection

All electrical work should be carried out by a suitably qualified technician. Failure
to comply with this could lead to electrocution, fire, and death. It will also invalidate
product warranty. All wiring should be according to national wiring regulations.
Breaker abbreviation Meaning
ECB1 Earth leakage circuit breaker for booster heater
TB1 Terminal block 1
ECB1
E
C
B
A
<Figure 4.4.1>
15
TB1
D
Discharge to drain
(pipe MUST be fitted by installer).
<Figure 4.3.7>
The hydrobox can be powered in two ways.
1. Power cable is run from the outdoor unit to the hydrobox.
2. Hydrobox has independent power source.
Connections should be made to the terminals indicated in the figures to the left
below depending on the phase.
Booster heater and immersion heater should be connected independently from
one another to dedicated power supplies.
Locally supplied wiring should be inserted through the inlets situated on the
base of the hydrobox. (Refer to <Table 3.3>.)
Wiring should be fed down the left hand side of the control and electrical box
and clamped in place using clips provided.
The wires should be inserted individually through the cable inlets as below.
Power line (B.H.)
Power line (I.H.) (option)
Indoor-Outdoor wire
Output wires
Signal input wires
Wireless receiver (option) wire
(PAR-WR51R-E)
Connect the outdoor unit – hydrobox connecting cable to TB1.
Connect the power cable for the booster heater to ECB1.
• Make sure that ECB1 is ON.
Factory-fitted pressure relief valve
(G1/2" female connection)
2 4 5 8
1 3 6 7