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7-2-2-3. Snowfall Fan Control
7-2-2-4. External master ON/OFF control
Operation
The outdoor unit fan operates when a Snowfall signal is received.
The control contents are accepted during leading and trailing of
the input signal.
(The status of leading and trailing should be held for 100mm. sec.
or more.)
External master ON/OFF control board : TCB-PCMO 2E
Outdoor unit destination to be connected becomes the header
outdoor unit (U1).
SMC: Snowfall detection switch
Operation
The outdoor unit starts or stops the system.
The control contents are accepted during trailing of the input signal.
(The status of trailing should be held for 100mm. sec. or more.)
NOTES
1) Do not turn on COOL and HEAT terminals concurrently.
2) Be sure to prepare a contact for each terminal.
Outside signal: No voltage pulse contact
External master ON/OFF control board : TCB-PCMO 2E
Outdoor unit destination to be connected becomes the header
outdoor unit (U1).
SMC: Input signal for start.
SMH: Input signal for stop.
Terminal
COOL
(SMC)
Heat
(SMH)
Input signal
ON
OFF
ON
OFF
Operation
Starts collectively indoor units.
Stops collectively indoor units.
Terminal
COOL
(SMC)
Input signal
ON
OFF
ON
OFF
Operation
Snowfall fan control
(Operates outdoor unit fan.)
Usual operation
(Releases control.)
CN509 (4P BLK)
Header outdoor unit interface P.C. board
Connection cable
External master
ON/OFF
control board
PJ17
(4P WHI)
SMC
HEAT
COOL
COM
Procured locally (Snow sensor)
CN512 (4P BLU)
Header outdoor unit interface P.C. board
Connection cable
External master
ON/OFF
control board
PJ17
(4P WHI)
SMC
HEAT
COOL
COM
Procured locally
SMH