Mitsubishi Electric ecodan ECOSLIM150L-PP-MEUK Installation Manual page 49

Electrical Installation
23
(continued)
2 Zone Control
The FTC4 factory manual uses a different method of 2 zone control to that commonly seen in the UK.
A low loss header or mixing tank is used to separate the hot water zone and the heat pump from the two
space heating zones; no zone valves are used on the output side of the header. Instead additional circulation
pumps are employed, one on each zone. There is also the option for different flow temperatures on each zone.
An example of this arrangement is shown below:
This setup cannot be integrated onto a 'standard' Pre-Plumbed Slimline Cylinder without drastically increasing
physical size and costs.
Therefore the hydraulic and electrical configuration on the Mitsubishi Electric Pre-Plumbed Slimline Cylinder
has been tailored to suit common UK 2 zone applications with a motorised valve controlling each zone directly
connected to the primary circuit. To achieve this a 2 zone accessory pack must be purchased, this will comprise
of the following items:
• Honeywell spring return 2 port zone valve
• Copper pipe stub including additional thermistor pockets
• Four additional flow and return thermistors
• Prewired cable with colour coded plug connector
In conjunction with this accessory pack the addition of a thermostats to control both zones will be required.
These thermostats must be third party items and connect to IN1 and IN6, both SW2-1 and SW3-1 MUST be
turned ON if IN1 and IN6 are to be utilised.
Please note that the flow switches will be turned off via DIP switches as will the mixing valve control as shown
in the above diagram.
All pre-plumbed cylinders come with DIP switches pre-set for 1 zone function; in the case that the 2 zone
accessory pack is to be utilised you MUST set the DIP switches appropriately as indicated in the table on page 43.
Pre-Plumbed Slimline Cylinder Installation Manual
49