Mitsubishi Electronics PUZ-A24NHA2-BS, PUZ-A42NHA2-BS, PUZ-A30NHA2

(5) Operation data during emergency operation

During emergency operation, no communication is performed with the indoor unit, so the data items needed for operation are set to the following values:

Operation data	Operation mode		Remarks

	COOL	HEAT
	COOL	HEAT

Intake temperature (TH1)	27:, 81˚F	20.5:, 69˚F

Indoor fluid pipe temperature (TH2)	5:, 41˚F	45:, 113˚F

Indoor 2-phase pipe temperature (TH5)	5:, 41˚F	50:, 122˚F

Set temperature	25:, 77˚F	22:, 72˚F

Outdoor fluid pipe temperature (TH3)	45:, 113˚F	5:, 41˚F	(w1)

Outdoor 2-phase pipe temperature (TH6)	50:, 122˚F	5:, 41˚F	(w1)

Outdoor air temperature (TH7)	35:, 95˚F	7:, 45˚F	(w1)

Temperature difference code (intake temperature - set temperature) (ΔTj)	5	5

Discharge super heat (SHd)	30degC, 54degF	30degC, 54degF	(w2)

Sub-cool (SC)	5degC, 9degF	5degC, 9degF	(w2)

w1: If the thermistor temperature data is normal (not open/short), that data is loaded into the control as valid data. When the unit enters emergency operation and TH values are mismatched, set the thermistors to open/short. And the unit runs emergency operation with the values listed above.

w2: If one thermistor is set to open/short, the values of SHd/SC will be different from the list abve.

[Example] When liquid temperature thermistor (TH3) has an open or short circuit.

Thermistor	COOL	HEAT

TH3	45:, 113˚F	5:, 41˚F

TH6	Ta	Tb

	Regard normal figure as effective data.
	Regard normal figure as effective data.

TH4	Tc	Td

	Regard normal figure as effective data.
	Regard normal figure as effective data.

TH5	5:, 41˚F	50:, 122˚F

TH2	5:, 41˚F	45:, 113˚F

Discharge superheat (SHd)

Cooling = TH4 - TH6 = Tc - Ta

Heating = TH4 - TH5 = Td - (50: or 122˚F)

Degree of subcooling (SC)

Cooling = TH6 - TH3 = Ta - (45: or 113˚F)

Heating = TH5 - TH2 = 50: - 45: = 5 degC. or

= 122˚F - 113˚F = 9degF

PUZ-A36NHA2-BS, PUY-A12NHA2, PUY-A42NHA2-BS, PUY-A30NHA2, PUZ-A36NHA2 specifications

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(5) Operation data during emergency operation

COOL

HEAT

Sub-cool (SC)

TH2

PUZ-A36NHA2-BS, PUY-A12NHA2, PUY-A42NHA2-BS, PUY-A30NHA2, PUZ-A36NHA2 specifications