Mitsubishi Electric ecodan ECOSLIM150L-PP-MEUK Installation Manual page 48

Electrical Installation
23
Fossil Fuel Boiler Connection
As shown on the schematic for Ecodan
technologies into a common system.
This setup provides the option for the FTC4 to intelligently control and prioritise either heat source, dependant on
either an outdoor temperature, energy use, cost or CO
control thermistors (PAC-TH011HT-E) which must be purchased separately and are required for this type of
installation.
Only space heating operation can be supplemented by the boiler; hot water mode is not possible directly from
the FTC4. When installing a boiler and Ecodan
Cylinder, the position of the low loss header means that both heat sources will be common to both DHW and space
heating. However, please note the boiler will only operate in space heating mode. Please refer to the schematic
earlier in this manual for clarification.
As boiler operation commences, pump overrun will occur meaning that all circulators will be energised.
This continues for a time dictated by the settings entered under 'economy setting for pump'. As detailed in the
'main controller operation' section this should always be set to 3 minutes with this option turned on via the tick box.
It is assumed the boiler will have its own dedicated circulation pump which is interlocked with the boiler not the
FTC4. Once the pump overrun period has ended, the main circulation pump on the cylinder (OUT1) and the
dedicated Ecodan
circulator and the boiler circulator are providing flowrate on each side of the low loss header.
The boiler control output (OUT10) has no voltage across it, unlike the other 240v outputs. It MUST be decided prior
to installation if the boiler in question can be controlled by this method or if a control voltage (AC/DC) is required
when boiler operation is ON.
For more details, refer to the installation manual of PAC-TH011HT-E.
Installation & System set up
1. Set Dip-SW 1-1 to ON "With boiler" and SW2-6 to ON "With Mixing tank".
2. Install the thermistors THWB1 (Flow temp.) and THWB2 (return temp.) *1 on the boiler circuit.
3. Connect the output wire (OUT10: Boiler operation) to the signal input (room thermostat input)
on the boiler. *2
Remote controller settings
Go to Service menu > Heat source setting and choose "Boiler" or "Hybrid". *3
1.
2. Go to Service menu > Operation settings > Boiler settings to make detailed settings for "Hybrid" above .
*1 The boiler temp. thermistor is an accessory.
*2 OUT10 has no voltage across it.
*3 The "Hybrid" automatically switches heat sources between heat pump and boiler.
Pre-Plumbed Slimline Cylinder Installation Manual
48
and fossil fuel boiler connection, it is possible to combine the two
®
®
circulation pump (OUT1 with relay protection) will de-energise meaning that the space heating
®
(continued)
emissions. Full instructions are provided with the boiler
2
in conjunction with a Mitsubishi Electric Pre-Plumbed Slimline