Electra DCR 25 Service Manual page 30

11.1.9 Heating Element Control
Heating element can be started if LOAD > 0.8 * MaximumNLOAD AND Indoor Coil
temperature < 45.
The heating element will be stopped when LOAD < 0.5 * MaximumNLOAD OR if Indoor Coil
temperature > 50.
11.1.10 Outdoor Fan Control
•
The OFAN motor is an AC type that operates with 2 speeds (Low/High),
controlled by Relays.
•
OFAN speed depends on the compressor Target Frequency, and it's set according to the
following table and graphs.
•
OFAN can change its Speed only if it has been working in the current
at least 35 seconds:
Compressor
Target Frequency
Freq=0
10 ≤ Freq < OFLowFreq
OFLowFreq ≤ Freq< OFMedFreq
OFMedFreq≤ Freq
Notes:
When OAT is faulty or disabled OFAN will follow 'Normal cases' rules (left column).
O FAN St at e
at Cool M ode
A
B
C
Not e: Per i or i t i es A>B>C
1. OFLowFreq =
OFLowFreqC
2. OFMedFreq =
OFMedFreqC
The OFAN will be off when the compressor is off.
•
An exception for the following rule is when compressor was operating in cool
mode before stopped. In this case OFAN will remain on in low speed for 1
minute.
•
Whenever the indoor unit is under indoor coil overheating protection, as long as the
protection status is HzD2, the outdoor fan will change to off. It will be enabled to be back on
when the status of this protection becomes normal.
•
Upon receiving night mode signal (ON), through communication, the OFAN will be
operating in LOW speed only in Cool. It will be back to its normal operation when receiving
OFF signal.
Service Manual - Delta DCI
Normal cases
State A at cool / Heat
OFF
Low
High
High
3 Degrees
3 Degrees
7 20 O AT
in cool mode, and
in cool mode, and
Revision Y05-01
CONTENT
CONTROL SYSTEM
OFAN Speed
State B State C
at cool at cool
OFF OFF
Low Low
Low Low
Low Low
in heat mode.
OFLowFreqH
in heat mode.
OFMedFreqH
speed for
o
OAT>15 C
at heat
OFF
Low
Low
High
11-3