Indoor Service Manual

Specications are subject to change without notice. © 2016 Mitsubishi Electric US, Inc.
21
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.
Factory Setting Mode
Heater Operation In
Error
Heater Operation During
Defrost
Fan Control When
Heater ON
Wired remote controller
(RF thermostat)
11 (111) 23 (123)
1 1 ● No Heater Present
2 1 ─
Heater Available
OFF OFF High
Disable heater during
Defrost and Error
2 2 ─
Heater Available
ON ON High
Enable heater and fan
during Defrost and Error
*1
*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]
Mode Change
Condition
(To -T
RA
) >
2.7 ° F
[1.5 °C]
AND
T
RA
has not
increased by
0.9 °F [0.5°
C] in X min
EH1 ON for
> 7 min
AND
(To -T
RA
) >
2.7 ° F
[1.5 ° C]
AND
T
RA
has not
increased by 0.9 ° F
[0.5° C] in 7 min
(To -T
RA
) <
0.9 °F
[0.5° C]
EH1 ON ○ AND ○
EH2 ON ○ AND ○ AND ○
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)