Supplementary Information; Refrigerant Collecting (Pumpdown) For Split Model Systems Only; Back-Up Operation Of Boiler; Multiple Outdoor Units Control - Mitsubishi Electric EHSC serie Para El Instalador

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Supplementary information

Refrigerant collecting (pumpdown) for split model systems only

Refer to "Refrigerant collection" in the outdoor unit installation manual or service manual.

Back-up operation of boiler

Heating operation is backed up by boiler.
For more details, refer to the installation manual of PAC-TH0HT-E.
<Installation & System set up>
. Set Dip-SW - to ON "With boiler" and SW2-6 to ON "With Mixing tank".
2. Install the thermistors THWB (Flow temp.) and THWB2 (return temp.) * on the boiler circuit.
3. Connect the output wire (OUT0: Boiler operation) to the signal input (room thermostat input) on the boiler. *2
4. Install one of the following room temp. thermostats. *3
Wireless remote controller (option)
Room temp. thermostat (field supply)
Main controller (remote position)
* The boiler temp. thermistor is an optional part.
*2 OUT0 has no voltage across it.
*3 Boiler heating is controlled on/off by the room temp. thermostat.
<Remote controller settings>
. Go to Service menu > Heat source setting and choose "Boiler" or "Auto". *3
2. Go to Service menu > Operation settings > Boiler settings to make detailed settings for "Auto" above .
*3 The "Auto" automatically switches heat sources between Heat pump (and Electric heater) and boiler.

Multiple outdoor units control

To realize bigger systems by using multiple outdoor units, up to 6 units of the same model can by connected.
The hydrobox can be used as a slave unit for multiple outdoor unit control.
For more details, refer to the installation manual of PAC-IF05/052B-E.
<Dip switch setting>
• Set Dip SW4- to ON "Active: multiple outdoor unit control".
• Keep Dip SW4-2 OFF (default setting) (master/slave setting: slave).
• Set Dip SW-3 to ON when the hydrobox is connected to a DHW tank.
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