Toshiba CARRIER RAV-SP300AT2-UL - Manual (Page 80)

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SW804
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SW804 Operation when pushdown button switch SW801 is pushed
4-way valve relay operation (For RY700, CN70 check)
Turn on 4-way valve power relay (RY700).
When pushing SW801 again or when 2 minutes elapsed, the
operation returns to the normal control.
[NOTE]
In case of these models adopting the self hold valve, the coil
develops fever. Therefore do not perform this operation as coil is
connected.
Self-hold valve suction operation (Exchange to heating cycle)
(For RY700 RY701, RY705, CN701 check)
Turn on relay RY700, RY701, RY705.
(CN701 between  and „ : Voltage=Approx. +198 to 380V)
This function works for 10 seconds and then is OFF.
Self-hold valve separation operation (Exchange to cooling cycle)
Turn on relay RY700.
(CN701 between 1) and 4): Voltage=Approx. –198 to 380V)
This function works for 10 seconds and then is OFF.
SV valve relay operation (For RY702, CN702 check)
Turn on SV valve relay (RY702).
When pushing SW801 again or when 2 minutes elapsed, the
operation returns to the normal control.
* For these models, the part is not mounted, so do not operate.
Heater output relay operation (For check RY703, CN703 check)
Turn on relay for option heater (RY703).
When pushing SW801 again or when 2 minutes elapsed, the
operation returns to the normal control.
Outside output relay operation (RY704, CN704)
Turn on relay for outside output (RY704).
When pushing SW801 again or when 2 minutes elapsed, the
operation returns to the normal control.
(No operation especially)
Relay operation change for outside output
[CAUTION]
Do not use this setting.
[CAUTION]
Although these operations can be
performed even during operation,
basically perform operation while
the unit stops.
If performing this operation during
driving the unit, it is dangerous
because the pressure may change
suddenly.