Mitsubishi Electric PAC-IF051B-E Installation Manual page 7

3. System
3.4 Fourth step (Functions setting)
* Make sure to check the followings for your safety when designing a system. These are the minimum requirement for the safe use of FTC4 unit.
Parts name Requirement
It is required to protect system from the effects of insufficient flow.
Flow switch
Strainer /Magnetic filter
Provide it as required to protect parts from damages caused by iron particles/water/contamination (e.g. the position before pump and return
(water circuit) part from emitters).
Pressure relief valve It is required to protect system from reaching high pressure.
(Primary circuit side) Select the operating pressure depending on water pressure in the circuit in normal use.
(Sanitary water side) Follow the national regulations.
3-way valve Current: 0.1A Max (If over 0.1A you must use a relay)
Power supply: 230V AC
Connect earth cable, if there is one.
Type: SPST
SPDT type can NOT be used.
2-way valve Current: 0.1A Max (If over 0.1A you must use a relay)
Power supply: 230V AC
Connect earth cable, if there is one.
Type: Normally closed
Select the 2-way valve that slowly opens and shuts off to prevent water hammer.
A by-pass valve or circuit should be installed between pump and 2-way valve for safety (to release pressure when the both 2-way valves are closed).
Select a 2-way valve equipped with manual override, which is necessary for topping up or draining of water.
Water circulation pump Current: 1.0A Max, Power supply: 230V AC
When connecting a pump with an electric current of
1. Use (a) relay(s).
2. When power is supplied from outdoor unit, TOTAL current (including the other parts) requirement MUST be
the outdoor unit PCB will blow. )
3. When independent power supplies (i.e. from the FTC4 unit itself) , total current for the pump(s) is
PCB will blow. )
Connect earth cable, if there is one.
Adjust the pump speed setting so that the flow rate in the primary circuit is appropriate for the outdoor unit installed see the table and figures below.
Outdoor heat pump unit
Packaged
Split
* The water velocity in pipes should be kept within certain limits of material to avoid erosion corrosion and excessive noise generation.
(e.g. Copper pipe: 1.5m/s)
1A or multiple pumps, please note the following.
Water flow rate range [L/min]
PUHZ-W50 6.5 - 14.3
PUHZ-W85 10.0 - 25.8
PUHZ-HW112 14.4 - 32.1
PUHZ-HW140 17.9 - 40.1
PUHZ-RP35 5.0 - 11.8
PUHZ-RP50 7.0 - 17.2
PUHZ-RP60 8.6 - 20.1
PUHZ-(H)RP71 10.2 - 22.9
PUHZ-(H)RP100 14.4 - 32.1
PUHZ-(H)RP125 17.9 - 40.1
PUHZ-RP140 20.1 - 45.9
PUHZ-RP200 27.3 - 64.2
PUHZ-HRP200 28.7 - 68.9
PUHZ-RP250 32.1 - 80.3
PUHZ-SW40 5.0 - 11.8
PUHZ-SW50 7.0 - 17.2
PUHZ-SW75 10.2 - 22.9
PUHZ-SW100 14.4 - 32.1
PUHZ-SW120 20.1 - 45.9
PUHZ-SW175 27.3 - 64.2
PUHZ-SW190 32.1 - 80.3
PUHZ-SHW80 10.2 - 22.9
PUHZ-SHW112 14.4 - 32.1
PUHZ-SHW140 17.9 - 40.1
PUHZ-SHW230 28.7 - 68.9
N L N L
TBO. 1
7 8 9 7 8 9
3-way valve 3-way valve
motor motor
SPST type SPDT type
3A (otherwise, the fuse on
3A. (otherwise, the fuse on the FTC4
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