Heater Control - Mitsubishi Electric M Series Service Manual

9

HEATER CONTROL

9-1. Control Specifications And Function Setting
• Table 1 shows the mode setting for the field-installed heater.
Table. 1 [Function Table]
Select unit numbers 01 to 03 or all units (AL [wired remote controller] / 07 [IR wireless remote controller])
Mode (function ) No.
Wired remote controller
Factory Setting
(RF thermostat)
11 (111) 23 (123)
1 1
2 1
2 2
*1 Heater will not operate during all error modes. Heater will only operate during a communication error between indoor unit and
outdoor unit.
• Table 2 shows how the field-installed heater is controlled.
Table. 2 [Heater Control Table]
(To -T RA ) >
Mode Change
2.7 ° F
[1.5 °C]
EH1 ON
EH2 ON
EH1 OFF
EH2 OFF
KEY
• EH1: Electric Heater 1
• EH2: Electric Heater 2
• To: Set point temperature
• T RA : Return Air temperature
• X: Time delay (Selectable. Default is 24 min. Selectable to 14, 19, or 29 min)
Mode
Heater Available
Disable heater during
Defrost and Error
Heater Available
Enable heater and fan
during Defrost and
Error *1
T RA has not
increased by EH1 ON for
AND
0.9 °F [0.5° > 7 min
C] in X min
AND
19
Heater Operation In Heater Operation
Error During Defrost
No Heater Present
OFF OFF
ON ON
Condition
(To -T RA ) >
AND 2.7 ° F AND
[1.5 ° C]
AND AND
Fan Control When
Heater ON
High
High
T RA has not (To -T RA ) <
increased by 0.9 ° 0.9 °F
F [0.5° C] in 7 min [0.5° C]
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