88
Note 1: Criteria for the difference between suction and discharge temperatures
(1) 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) 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 control 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.
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).
* 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
* 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 6, “Control Outline: Outdoor Unit, Outdoor Fan
Control.”
Model MMY-MAP 0724HT6UL 0964HT6UL 1144HT6UL
Current value (A) 18 23 24
Model
Operating
mode
Pressure
(psi)
Pipe surface temperature
(°F)
Number of compressor
rotations
(rps)*
Indoor
fan
Air temp.
condition
(DB/WB) (°F)
MMY-MAP Pd Ps
Discharge
(TD)
Suction
(TS)
Indoor
heat
exchanger
(TCJ)
Outdoor
heat
exchanger
(TE)
Liquid
temp.
(TL)
Comp.1 Comp.2 Comp.3 Indoor
Outdo
or
0724HT6UL
Cooling 410 130 180 60 48 105 105 50 50 – High 80/67 95/-
Heating 420 102 181 40 100 35 90 50 50 – High 70/- 47/43
0964HT6UL
Cooling 415 130 181 60 48 105 105 45 45 45 High 80/67 95/-
Heating 430 102 183 38 100 35 90 50 50 50 High 70/- 47/43
1144HT6UL
Cooling 435 130 183 60 50 105 105 50 50 50 High 80/67 95/-
Heating 420 100 181 39 100 35 90 57 57 57 High 70/- 47/43
Operating mode Cooling Heating
Indoor temp. (°F) 64 – 90 59 – 77
Outdoor temp. (°F) 77
– 95 41 – 50
Pressure
Pd (psi) 290
– 465 365 – 475
Ps (psi) 75
– 135 70 – 110
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