Carrier MMY-MAP0724FT9UL Service Manual page 61

NO. Item
2
Outdoor fan 1. All cooling fan control
control
1) Outdoor fan speed (mode) is controlled on the basis of measurements provided
2) For a specified period after the start of cooling operation, the header outdoor
384 (2.65)
355 (2.45)
341 (2.35)
312 (2.15)
290 (2.00)
283 (1.95)
* Available control modes are 0 (at rest) to 63.
2. All heating fan control
1) Outdoor fan speed (mode) is controlled on the basis of measurements provided
2) If TE1 > 77°F (25°C) is continuously detected for 8 minutes, the fan may be
3) For a specified period after air conditioner startup and during defrosting, this
4) When refrigerant is in extremely short supply, this control may cause the air
TE1 temperature
3. Mainly cooling fan control
The outdoor fan rps (mode) is controlled by the objective condensation
temperature (Pd) during mainly cooling operation.
4. Control while follower unit stops
To prevent refrigerant stagnation into heat exchanger of the outdoor unit, operate
the fan with Mode 1. (Except defrost operation)
by the Pd pressure sensor.
unit controls outdoor fan speed (mode) on the basis of measurements provided
by the Pd pressure sensor. Follower units, on the other hand, control outdoor fan
speed (mode) on the basis of measurements provided by the TE1 temperature
sensor.
Pd
pressure
psi (MPa)
435 (3.0)
[Highest mode]
[Current mode - 1]/50 seconds
Mode being lowered:
Highest mode - 1
[Current mode - 1]
(Mode lowered as rapidly as
every two seconds)
(down to mode 0)
by the TE1 temperature sensor.
turned off.
However, this condition is the same as normal thermo OFF, so that fan operation
will be restarted.
control is disabled.
conditioner to be repeatedly turned on and off.
˚F (˚C)
Zone A: Lowest mode, timer count for forced compressor shutdown
77 (25)
Zone B: -2/30 seconds (down to lowest mode)
46.4 (8)
Zone C: -1/30 seconds (down to lowest mode)
42.8 (6)
Zone D: Hold (staying at current mode)
39.2 (4)
Zone E: +1/30 seconds (up to highest mode)
35.6 (2)
Zone F: Highest mode
Pd (psi(MPa))
At heating At heating
thermo-OFF thermo-ON
450 (3.10) 466 (3.21)
426 (2.94) 455 (3.14)
395 (2.72) 426 (2.94)
387 (2.67) 415 (2.86)
373 (2.57) 400 (2.76)
Specification outline
[Current mode + 1]
(Mode raised as rapidly
as every second)
[Current mode + 1]/50 seconds
[Hold]
Mode being raised: mode 0
1
[Mode at present + 1] / Until Min.1 second
[Mode at present + 1] / 40 seconds
HOLD (Keeps the mode at present)
[Mode at present – 1] / 40 seconds
[Mode at present – 1] / 16 seconds
[Mode at present – 1] / 2 seconds
– 61 –
[Current mode + 1]/75 seconds
(Mode raised up to 13)
(Mode 1 to highest)
1
Interval control
[Mode [0]: 180 seconds
Mode [1]: 30 seconds]
Remarks
• The fan speed
corresponding to
the highest mode
varies with the
Ton capacity of
the outdoor unit.
• The fan speed
corresponding to
the highest mode
varies with the Ton
capacity of the
outdoor unit.
• The fan speed
corresponding to
the highest mode
varies with Ton
capacity of the
outdoor unit
• This control may
cause the air
conditioner to be
fan stop.