Carrier MMY-MAP0724FT9UL Service Manual page 111

Note 1: Criteria for the difference between suction and discharge temperatures
(1) Individual cooling operation
After operating for a minimum of 30 minutes in "COOL" mode, if the ΔT dry bulb temperature difference
between suction and discharge air of the indoor unit is 46.4°F (8°C) or more, it is normal.
(2) Individual heating operation
After operating for a minimum of 30 minutes in "HEAT" mode, if the ΔT dry bulb temperature difference
between suction and discharge air of the indoor unit is 59°F (15°C) or more, it is normal.
* If demand from the indoor unit on the outdoor unit is low because the difference between the temperature
set by the remote controller and the temperature of the room is small, then the ΔT temperature difference
is small.
* Consider that ΔT temperature difference may diminish in cases of a system in which the connected indoor
unit capacity exceeds the outdoor unit capacity, the pipe length is long, or a large difference exists among
outdoor units.
Note 2: Criteria for operating power current
The table below shows the maximum current for each outdoor unit. Under standard conditions, operating
current is about 80% of the value shown in the table below.
Outdoor unit MMY-MAP
current valve (A)
Note 3: Criteria for cycle status
(1) These data are based on operating a 4-way Cassette type air conditioner of 100% connection with
standard piping length.
Data may vary depending on temperature conditions, installed pipe length, and room shape combinations,
or indoor unit connection capacity.
For pressure criteria in different temperature conditions, refer to (2).
Pressure (psi)
Model Operating
MMY-MAP mode
Pd
All cooling 410
0724FT9UL
/ 0724FT6UL
All heating 428
All cooling 415
0964FT9UL
/ 0964FT6UL
All heating 430
All cooling 421
1204FT9UL
/ 1204FT6UL
All heating 435
* This compressor is driven with a 4-pole motor. The value of the compressor frequency (rps) measured with a
clamp meter at the compressor lead line is two times the rotation count (rps) of the compressor.
* Each compressor may have a different frequency as a measure against resonance.
* The temperature of the indoor heat exchanger (TC) indicates TCJ sensor temperature when cooling, and
TC2 sensor temperature when heating, respectively.
(2) Criteria for operating pressure
Operating mode
Indoor temp.
Outdoor temp.
Pd
Pressure
Ps
* Criteria after 15 minutes or more has passed since operating started.
(3) On rotations of outdoor fans
Outdoor fans may rotate slowly to control pressure when cooling with low outer air temperature or heating
with excessive load. For control content, also refer to items in Section 5, "Control Outline: Outdoor Unit,
Outdoor Fan Control."
0724FT9UL 0964FT9UL
34 50
Pipe surface temperature (˚F)
Discharge Suction 1 Suction 2
Ps
(TD) (TS1) (TS2)
130 183 82 59
102 184 39 40
130 184 83 60
102 186 37 38
130 186 84 60
100 184 37 39
All cooling All heating
(˚F) 64 – 90
(˚F) 77 – 95
(psi) 290 – 465 365 – 475
(psi) 75 – 135
1204FT9UL 0724FT6UL 0964FT6UL 1204FT6UL
52
Indoor Outdoor
Liquid
heat heat
temperature
exchanger exchanger
(TL)
(TC) (TE)
48 105 102
100 38 90
48 105 102
100 36 91
50 105 102
101 36 91
59 – 77
41 – 50
70 – 110
– 111 –
19 28
Number of compressor rotations (rps)*
Compressor Compressor Compressor
1 2
50 50
50 50
45 45
50 50
50 50
57 57
30
Air temperature
Indoor condition
(DB/WB)(˚F)
fan
3
Indoor Outdoor
— High 80/67 95/—
— High 70/— 47/43
45 High 80/67 95/—
50 High 70/— 47/43
50 High 80/67 95/—
57 High 70/— 47/43