3. System
Parts name
Requirement
Flow switch
It is required to protect system from the effects of insufficient flow.
Strainer /Magnetic filter
(water circuit)
Provide it as required to protect parts from damages caused by iron particles/water/contamination (e.g. the position before pump and return
part from emitters).
Pressure relief valve
(Primary circuit side)
(Sanitary water side)
It is required to protect system from reaching high pressure.
Select the operating pressure depending on water pressure in the circuit in normal use.
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 1A or multiple pumps, please note the following.
1. Use (a) relay(s).
2. When power is supplied from outdoor unit, TOTAL current (including the other parts) requirement MUST be
3A (otherwise, the fuse on
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 3A. (otherwise, the fuse on the FTC4
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
Water flow rate range [L/min]
Packaged
PUHZ-W50
6.5 - 14.3
PUHZ-W85
10.0 - 25.8
PUHZ-HW112
14.4 - 32.1
PUHZ-HW140
17.9 - 40.1
Split
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
* 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)
Continue to the next page.
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.
N
L
7 8 9
3-way valve
SPST type
N
L
7 8 9
3-way valve
motor
motor
SPDT type
TBO. 1
