Toshiba MMY-MUP0961HT6P-UL Service Manual page 54

Item Description of operation, numerical data, and other information
2. Outdoor 1. Cooling fan control
fan control 1) Outdoor fan speed (mode) is controlled on the basis of measurements provided by
the Pd sensor.
2) For a specified period after the start of cooling operation, the header outdoor unit
controls outdoor fan speed (mode) on the basis of measurements provided by the
Pd sensor. Follower units, on the other hand, control outdoor fan speed (mode) on
the basis of measurements provided by the TE1 temperature sensor.
Pd
psi (MPa)
435(3.00)
406(2.80)
384(2.65)
355(2.45)
341(2.35)
312(2.15)
290(2.00)
283(1.95)
203(1.40)
* Available control modes are 0 (at rest) to 63.
2. Heating fan control
1) Outdoor fan speed (mode) is controlled on the basis of the measurements provided
by the TE temperature sensor.
2) If TE > 77 ºF(25 ºC) is continuously detected for 8 minutes, the fan maybe turned off.
However, this condition is the same as normal thermostat OFF, so that fan operation
will be restarted.
3) For a specified period after air conditioner start up and during defrosting this control is
disabled.
4) When refrigerant is extremely short supply, this control may cause the air conditioner
to be repeatedly turned on and off.
TE1 temperature
°F(°C)
77(25)
46.4(8)
42.8(6)
39.2(4)
35.6(2)
3. Upper limit shift correction control in outdoor fan mode while operating in heating mode
. . . This is a control that lowers the upper limit of the outdoor fan speed during heating
operation when the air conditioning load is low and the number of indoor units
operating is small.
1) Lowers the current fan mode upper limit by -1 mode
2) After that, while the conditions are met, the mode will be down every 30 seconds.
3) The lower limit of the mode down is the fan mode "54".
4) When the comp is turned off, this control is canceled and it returns to the initial setting
upper limit mode.
5) When the number of indoor driving increases, one mode will be up every 30 seconds.
[Highest mode]
[Current mode -1] / F seconds
(mode being lowered: Highest
mode -1 → 1)
[Current mode -1] / 2 or 16 seconds
(down to mode 0)
(mode lowered as rapidly
as every two seconds)
Zone A: Lowest mode, timer count for forced compressor shutdown
Zone B: -2/15 seconds (down to lowest mode)
Zone C: -1/15 seconds (down to lowest mode)
Zone D: Hold (staying at current mode)
Zone E: +1/15 seconds (up to highest mode)
Zone F: Highest mode
Zone A: Lowest mode, timer count for forced compressor shutdown
Zone B: -2/15 seconds (down to lowest mode)
Zone C: -1/15 seconds (down to lowest mode)
Zone D: Hold (staying at current mode)
Zone E: +1/15 seconds (up to highest mode)
Zone F: Highest mode
TE1 temperature °F(°C)
[Current mode +1] / 1 second
[Current mode +1] / 3 seconds
[Current mode +1] / F seconds
(mode 2 ~ Highest)
[Current mode +1] / 75 second
[Hold]
(mode raised up to 13)
(mode 1 to highest)
Mode being raised:mode 0→1
Interval control
[Mode [0]:180 seconds
Mode [1]:30 seconds]
- 54 -
Remarks
• The fan speed
corresponding to the
highest mode varies with
the capacity of the
outdoor unit.
• Pd control point may
change depending on
conditions and operation
mode
• TE sensor temperature
is the lowest temperature
by comparing TE 1, 2, 3
• The fan speed
corresponding to the
highest mode varies with
the capacity of the
outdoor unit.
• Mode down is valid only
when TH(x) temperature
< 167°F(75°C)
• Mode up is valid only
when TH(x) temperature
≥ 176°F(80°C)