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8.5 Electric Heater Control
NOTE
• Electric heat will only operate when DIP SW are set for AHU controller to operate in
Return Air Control.
• If DIP SW are set for AHU controller to operate in Return Air Control, Damper Signal
Output can be used to control 2nd stage electric heat (EH2).
8.5 Electric Heater Control
NOTE
• Control specifications and DIP S/W setting
• Electric heat will only operate when DIP SW are set for AHU controller to operate in Return Air Control.
• If DIP SW are set for AHU controller to operate in Return Air Control, Damper Signal Output can be used to control 2nd stage electric heat (EH2).
– Table 1 shows the function settings for the field-installed heater. Select the desired pattern in the table
• Control specifications and DIP S/W setting
below, and set the DIP SW on the outdoor and indoor units as shown in Table 1.
• Table 1 shows the function settings the field-installed heater. Select the desired pattern in the table below, and set the DIP SW on the outdoor and indoor units as shown in Table 1.
Table 1. [DIP S/W]
Table 1. [DIP S/W]
Outdoor unit setting
DIP S/W OFF In the case of:
TKMU/YKMU: SW4: 932 OFF
TLMU/YLMU: SW4: 932 OFF
DIP S/W ON In the case of:
TKMU/YKMU:
SW4: 932 ON
TLMU/YLMU:
SW4: 932 ON
a
Default settings: SW3-2 OFF, SW3-4 OF
b
Heater will not operate during all error modes. Heater will only operate during a communication error between indoor unit and outdoor unit.
c
Heater will not operate during all error modes. Heater will only operate during a communication error between indoor unit and outdoor unit.
Table 2
d
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 shows how the field-installed heater is controlled.
Table 2. [Heater Control Table]
Table 2. [Heater Control Table]
(T
-T
)
O
RA
Mode Change
> 2.7 °F[1.5 °C]
●
EH1 ON
EH2 ON
EH1 OFF
EH2 OFF
KEY
• EH1: Electric Heater 1 (CN24)
• EH2: Electric Heater 2 (CN27)
• T
: Set point temperature
O
• T
: Return Air temperature
RA
• X: Time delay (Selectable. Default is 20 min. Selectable to 10, 15, or 25 min)
Specifications are subject to change without notice.
PAC-AH001-1
Condition of outdoor unit
N / A
Normal drive
Normal Drive
Defrost drive
H/P drive
H/P drive
Defrost drive
Outdoor temp.
H/P drive
Parameters a/b/c/d are set by
H/P stop
maintenance tool.
1
T
has not
RA
increased by
EH1 ON for
AND
0.9 °F [0.5°C]
> 5 min
in X min
●
AND
●
48
PAC-AH001-1
DIP SW
a
(AHU controller)
SW3-2
SW3-4
Mode
OFF
-
ON
OFF
Heater Available
ON
ON
Heater Available
OFF
-
ON
OFF
Heater Available
ON
ON
Heater Available
OFF
-
ON
OFF
Heater Available
ON
ON
Heater Available
Condition
T
increased by
(T
-T
)
O
RA
AND
AND
0.9 °F [0.5°C]
> 2.7 °F [1.5 °C]
●
AND
AND
Heater Control
Defrost
Error
Heater not Available
OFF
OFF
b
ON
ON
Heater not Available
OFF
OFF
ON
b
ON
Heater not Available
OFF
OFF
b
ON
ON
has not
RA
(T
-T
)
O
RA
< 0.9 °F [0.5°C]
in 5 min
●
●
●
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