Control Outline - Toshiba MCY-MHP0404HS-E Service Manual

6

Control outline

Outdoor unit
Item Description of operation, numerical data, and other information
1. Pulse PMV1 control
motor valve 1) During air conditioner operation, the pulse count of a PMV (pulse motor valve) is
(PMV) controlled between 30 and 500.
control 2) During cooling, the PMV opening is controlled on the basis of measurements
provided by the TL temperature sensor and the PD pressure sensor (subcool
control).
3) During heating, the PMV opening is controlled on the basis of measurements
provided by the TS and TD temperature sensors and the PS pressure sensor
(super heat control).
4) PMVs are fully closed when the air conditioner is in thermostat OFF state or upon
being turned off normally or shut down due to an abnormality.
2. Outdoor 1. Cooling fan control
fan control 1) Outdoor fan speed (mode) is controlled on the basis of measurements provided by
the PD pressure sensor.
2) For a specified period after the start of cooling operation, the outdoor unit controls
outdoor fan speed (mode) on the basis of measurements provided by the PD
pressure sensor.
PD
pressure
[MPa]
* Available control modes are 0 (at rest) to 31.
AMP Air Conditioning
[Highest mode]
[Hold]
[Current mode - 1] / 40 seconds
Mode being lowered:
Highest mode 1
[Current mode + 1]
(Mode raised as rapidly as
every two seconds)
[Current mode + 1] / 40 seconds
[Current mode + 1] / 40 seconds
(Mode raised up to 7)
(Mode 1 to highest)
Mode being raised: mode 0
Interval control
[Mode [0]: 180 seconds
Mode [1]: 30 seconds]
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Remarks
1
The fan speed
corresponding to the highest
mode varies with the HP
capacity of the outdoor unit.