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11. SYSTEM DESIGN
11-2-5. External Input/Output Function
Preset temperature input (external analog input: 4mA-20mA)
External input is input through CN421, CN422 on the circuit board. (Fig. 1)
[Fig. 1]
3
2
1
External
3
2
1
analog input
Use the supplied connector.
If no temperature settings are made via the MA remote controller, the temperature changes with the current of generator.
Refer to the instructions manual that came with the MA remote controller for how to make the settings.
4 mA → 50 °F (10 °C)
20 mA → 160 °F (71 °C)
External output terminal
External output terminal (refer to Fig. 2) is ineffective when the circuit is open.
Refer to Table 1 for information about each contact.
The current in the circuit to be connected to the external output terminal must be 0.6A or less.
[Table. 1]
OUT1
Operation ON/OFF
OUT2
OUT3
Compressor
OUT4
Error Signal
External input terminal
Wiring length must be within 328 ft. (100 m).
External input terminal (refer to Fig. 2).
Refer to Table 2 through Table 4 for information about each contact.
Only the "pump interlock" function is ineffective when the circuit is short-circuited.
Connect a relay circuit to the external output terminal as shown in Fig. 3.
The specifications of the relay circuit to be connected must meet the following conditions.
Contact rating voltage >= DC15V
Contact rating current >= 0.1A
Minimum applicable load =< 1mA at DC
[Table 2 TB142A]
IN1
Pump Interlock
[Table 3 TB142B]
IN3
Connection Demand
IN4
Operation ON/OFF
[Table 4 TB142C]
COM+
Common
IN5 *1
Hot Water/Heating
IN6 *2
Heating ECO *5
IN7 *3
Antifreeze *6
IN8 *4
Cooling Operation
*1
PWFY-P36NMU-E-BU: Hot Water
PWFY-P36, 72NMU-E-AU: Heating
*2
Effective when SW 4-3 is set to ON.
*3
Effective when SW 4-4 is set to ON.
*4
PWFY-P36, 72NMU-E-AU only
*5
When Heating ECO mode is effective, the outlet water temp. will be changed based on ambient temp. automatically.
*6
When Anti-freeze mode is effective, the unit will work for keeping set water temp. automatically.
Note: Dip S/W 1-1 OFF: Water Inlet Temp.
Dip S/W 1-1 ON : Water Outlet Temp.
The factory setting for Dip SW 1-1 is OFF.
Signal priority = External input > centralized controller > remote controller
3
2
1
current
direction
+
Current generator
[Fig. 2]
Defrost
[Fig. 3]
TB142A
IN1
PWFY-P-NMU-E-BU/PWFY-P-NMU-E-AU (Sept. 2010)
3
2
1
current
direction
+
TB141A
OUT1
OUT2
TB142B
IN2
IN3
IN4
COM+
OUT3
OUT4
TB142C
IN5IN6 IN7 IN8
PWFY-31
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