Microprocessor Control; Auto Operation - Mitsubishi Electric CITY MULTI PEFY-AF1200CFM-E Technical & Service Manual

[ VII Microprocessor Control ]
VII Microprocessor Control

[1] Microprocessor Control

1. Auto operation

PEFY-AF1200CFM-E
The operating mode is only "AUTO" in this system.
If operating mode is set to other than "Auto" , the display on RC is changed to "Auto" in a little
time automatically. The system keeps "Auto" mode constantly.
Supply air (SA)
(A) TH24
(B) HU
(C) TH21
1.Thermoregulation function
Supply air temperature (C) is controlled to reach the target supply air temperature TDm.
Inlet air temperature (A) and humidity (B) are used for the thermorequlating.
(1) Thermoregulating function
M o d e Condition
C o o n i l g TH24 < 70°F[21°C] and TDin<TDm and 3mins. has passed.
TH24 ≥ 72°F[22°C] and TDin ≥ TDm+2F and 3mins. has passed.
TH24 ≥ TDm+2F and 3mins. has passed.
H e t a n i g
TH24 < TDm and 3mins. has passed.
TDin Dew point temperature of inlet air
TDm Target temperature by dip switch setting
SW3-6 SW3-8
OFF OFF
OFF ON
ON OFF
ON ON
The factory setting is 55°F[12.8°C]
*1 Temperature set range of remote controller is from 50°F to 70°F [10°C to 21°C].
If set temp. is set beyond or below RC range(50-70 ° F[10-21°C]), the display on RC is changed to
lowest (50 ° F[10°C]) or highest (70 ° F[21°C]) possible temp. in a little time automatically.
2.Mode change
(1)HEAT mode → COOL mode
TH24 ≥ TDm + 2F and 3mins. has passed.
(2)COOL mode → HEAT mode
TH24 < TDm and 3mins. has passed.
HWE13100
Indoor unit
Heat exchanger
(C)
Thermistor (Inlet air temperature)
Humidity sensor (Inlet air humidity)
Thermistor (Outlet air temperature)
TDm
50°F [10°C]
55°F [12.8°C]
60°F [15.6°C]
Preset temperature by remote controller*1
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Fan motor
(B)
Inlet air (OA)
(A)
Outdoor unit
S a t e t
T h r e m o O F F
Thermo ON
T h r e m o O F F
Thermo ON
GB