Delta PG-35 Service Manual download pdf (Page 48)

11-3

CONTROL SYSTEM

SM DELTA 1-E.2 GB

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

speed for

at least 35 seconds:

Compressor

Target Frequency

OFAN Speed

Normal cases

State A at cool / Heat

State B

at cool

State C

at cool

OAT>15

at heat

Freq=0

OFF OFF OFF OFF

10 ≤ Freq < OFLowFreq Low Low Low Low

OFLowFreq ≤ Freq< OFMedFreq High Low Low Low

OFMedFreq≤ Freq High Low Low High

Notes:

When OAT is faulty or disabled OFAN will follow ‘Normal cases’ rules (left column).

1. OFLowFreq =

OFLowFreqC in cool mode, and OFLowFreqH in heat mode.

2. OFMedFreq =

OFMedFreqC in cool mode, and OFMedFreqH in heat mode.

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.

OAT

OFAN St

at Cool Mode

3 Degrees

No t e : Per i o r i t i es A>B>C

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Delta PG-35 Service Manual Page 48

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