Delta PG-35 User Manual download pdf (Page 35)

11-7

CONTROL SYSTEM

SM DELTAZ 1-E.0 GB

11.7.5 Heat Sink Over Heating Protection

A new control status will be set according to the following graph every one-minute or whenever when

going up by the rows.

HST

is the current reading of HST and HST

n-1

is the last reading of HST.

HST

-HST

n-1

<-1 -1 0 1 >1

HST

> HSTOH5 SC SC SC SC SC

HSTOH4 ≤ HST

< HSTOH5 D1 D1 D2 D2 D2

HSTOH3 ≤ HST

< HSTOH4 SR SR D1 D2 D2

HSTOH2 ≤ HST

< HSTOH3 SR SR SR D1 D1

HSTOH1 ≤ HST

< HSTOH2 Norm Norm Norm SR SR

HST

< HSTOH1 Norm

(*) Normal (Norm) – No protection status is ON.

Stop-Rise (SR) – System is in protection.

HzDown1 (D1) - System is in protection.

HzDown2 (D2) - System is in protection.

11.7.6 Outdoor Coil Deicing Protection

11.7.6.1 Deicing Starting Conditions

Deicing operation will start when either one of the following conditions exist:

 Case 1: OCT <-DST – AND TLD > DI

 Case 2: OCT < OAT

max

– 12 AND TLD > 30 minutes.

 Case 3: OCT <-1 AND TLD> 100 mnutes.

 Case 4: OCT is Invalid AND TLD > DI

 Case 5: Unit is just switched to STBY AND OCT <-DST

 Case 6: NLOAD = 0 AND OCT <-DST

DST Calculation:

When OATmax >0 or OAT is invalid; then DST=8

When OATmax ≤0; then DST= round down (-0.8 * OATmax) + 8

OATmax calculation:

After compressor starts for 3 minutes, OATmax calculation is start.

The OATmax is the moving value of the Maximum OAT during the 1st 10mintues within last

30minutes

OCT – Outdoor Coil Temperature

OAT – Outdoor Air Temperature

TLD – Time from Last Deicing

DI – Deicing Interval (Time Interval Between Two Deicing)

Deicing interval time when compressor is first started in heat mode, is 10 minutes if OCT < -2, and

is 40 minutes in other cases.

Deicing interval time is changed (increased/ decreased in 10 minutes steps) as a function of

deicing time. If deicing time is shorter then former deicing time, the deicing interval time will be

increased. If deicing time is longer then former deicing time, the deicing interval time will be

decreased.

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Delta PG-35 User Manual Page 35

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