Mitsubishi Electric Ecodan HUS210FTC4ST Installation Manual page 25

Cylinder & Hydraulic Components Install Guidance
17
(continued)
Immersion Heaters
Only immersion heaters with a thermal high limit cut-out may be used. To help ensure this the immersion heaters
have a 2¼" BSP thread. They are rated at 3kW at 240 V and are of low noise construction. They have both a
control thermostat and a high limit cut-out. Please order the correct replacement, fitting non-approved immersions
may affect your guarantee. When fitting, ensure the 'O' ring is positioned correctly on the head of the immersion
heater and lubricate before fitting. Fit it by hand until almost home and then tighten gently as the 'O' rings will seal
easily. The electrical supply to each immersion heaters must be fused spur rated at 16A via a double pole isolating
switch to BS 3456. The cable must be at least 2.5mm² heat resistance (85°C HOFR) sheathed flex complying to BS
6141:1981. In all cases it is the responsibility of the electrician to select and certify the cabling and fuse rating of the
immersion heater circuit. Do not operate the immersion heater/s until the unit is full of water. Do not operate the
immersion heater if any sterilisation liquid is in the cylinder as this will cause premature failure. To complete the
wiring use the appropriate wiring diagrams in the electrical installation section of this manual. Ensure that if internal
control stat is fitted it is set higher than the target on the main controller.
Connecting To The Cylinder
All of the pipework connections on the cylinder are 22mm compression and supplied complete with gland nuts and
olives in the Accessory Kit box. Only connect 22mm copper tube to these connections. Cut the tube with a pipe
cutter and ensure no sharp edges or burrs protrude. Slide both the gland nut and olive onto the tube and push the
tube fully home into the connection ensuring the tube end fully bottoms on the connection recess. Smear the outer
wall of the olive with plumbing paste and tighten the gland nut in the prescribed manner. Upon filling /
commissioning ensure all connections are completely watertight.
Note: No control or isolation valve should be fitted between the expansion relief valve and the storage cylinder. The
relief valve connections should not be used for any other purpose. Check all the connections for tightness including
any factory made connections
Fernox TF1 Compact Filter
All Mitsubishi Electric pre-plumbed cylinders now have the TF1 compact filter factory fitted on the heat pump return
pipework which is common to both heating and hot water zones. This has been done following feedback from our
installers and in an effort to ensure that every cylinder and Ecodan
ferrous and non-ferrous material. Periodic servicing of this filter in accordance with the manufacturer's
recommendations is strongly advised to ensure there are no restrictions to the flow rate. Full technical details on
this product can be found in the accompanying manual.
Zone Valves
All cylinders come with pre-installed Honeywell spring return two port valves, on all models above 150 litres there
are two heating valves serving separate hydraulic zones all models also come with a hot water valve.
® combination is adequately protected against
FTC4 Installation Manual
25