Mitsubishi Electric PAC-IF032B-E Installation And Operation Manual page 7

3. System
3.4. Fourth step (Water circuit parts installation)
* Make sure to check the followings for your safety when designing a system. These are the minimum requirement for the safe use of FTC2B unit.
Parts name
Booster heater General
Control Power for
Contactor
Separate power for
Heater
Safety device
Immersion heater General
Control Power for
Contactor
Separate power for
heater
Safety device
Water circulation pump Connect a pump via relay.
Current: 0.5A Max , 10mA Min
Power supply: 230V AC
Connect the surge absorber according to the load at site.
Adjust the pump speed 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)
* Consider necessity and capacity of booster heater to meet the following points.
(1) Heating capacity and flow water temperature should always be sufficient.
(2) System can increase the temperature of the stored water in tank to inhibit legionella bacterium growth.
Current: 0.5A Max , 10mA Min , Power supply: 230V AC
* Use a relay.
Connect the surge absorber according to the load at site.
Install an earth leakage circuit breaker for heater, separate from control power.
* When using two booster heaters, booster heater 1 capacity must be less than that of booster heater 2.
When using a single booster heater, use booster heater 1.
Heater capacity/Breaker/wiring (recommended)
<1 Phase>
Description Power Total capacity
supply (BH1 + BH2)
Booster heater ~/N 230V 2 kW (2 kW + 0 kW) 16 A
(Primary circuit) 50Hz
6 kW (2 kW + 4 kW) 32 A
* When installing a booster heater with the capacity of bigger than shown above, select an appropriate size breaker and
cable (diameter) based on the maximum possible electric current.
(1) Use an overheat protection thermostat (manual reset type) (to detect unusual temperature increase/heating up without water).
Protection device operating temperature must be above 80 °C. Protection device should not operate quickly, but water
circuit must not boil even when heater(s) overshoot.
(Reference value) Thermostat operation temperature used in our Cylinder unit and Hydrobox : 90 °C ± 4 °C
(2) Connect a pressure relief valve on the primary circuit side.
* Consider necessity and capacity of immersion heater to meet the following points.
(1) Heating capacity and flow water temperature should always be sufficient.
(2) System can increase the temperature of the stored water in tank to inhibit legionella bacterium growth.
Current: 0.5A Max , 10mA Min , Power supply: 230V AC
* Use a relay.
Connect the surge absorber according to the load at site.
Install an earth leakage circuit breaker for heater, separate from control power.
Heater capacity/Breaker/wiring (recommended)
Description Power supply
Immersion heater (DHW tank) ~/N 230V 50Hz
* When installing an immersion heater with the capacity of bigger than shown above, select an appropriate size breaker
and cable (diameter) based on the maximum possible electric current.
(1) Install the enclosed thermistor THW5 on the DHW tank. （Microcomputer detecting temperature for protection: 80 °C)
(2) Use a built-in direct cut-off thermostat (manual reset type).
Protection device operating temperature must be above 80 °C. Protection device should not operate quickly, but water
circuit must not boil even when a heater overshoots.
(Reference value) Thermostat operation temperature used in our Cylinder unit : 85 °C ± 5°C
(3) Connect a pressure relief valve on the sanitary water side.
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
Requirement
<3 Phase>
Breaker Wiring
Description Power
supply
2.5 mm² Booster heater 3~ 400V
(Primary circuit) 50Hz
6.0 mm²
Capacity Breaker Wiring
3 kW 16 A 2.5 mm²
Total capacity Breaker Wiring
(BH1 + BH2)
9 kW (3 kW + 6 kW) 16 A 2.5 mm²