Airwell PNXA 12 DCI, Руководство по обслуживанию

Страница: 76 / 108

CONTROL SYSTEM
12-8
SM PNXADCI 1-A.1 GB
HST
n
is the current reading of HST and HST
n-1
is the last reading of HST.
HST
n
-HST
n-1
HST
n
<-1 -1 0 1 >1
HST
n
> HSTOH5 SC SC SC SC SC
HSTOH4 ≤ HST
n
< HSTOH5 D1 D1 D2 D2 D2
HSTOH3 ≤ HST
n
< HSTOH4 SR SR D1 D2 D2
HSTOH2 ≤ HST
n
< HSTOH3 SR SR SR D1 D1
HSTOH1 ≤ HST
n
< HSTOH2 Norm Norm Norm SR SR
HST
n
< 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.
12.7.7 System Over Power Protection
Power
n
-Power
n-1
Power
n
<-50 [-50,-1] 0 [1,50] >50
Power
n
> OVRPWR5 SC SC SC SC SC
OVRPWR4 ≤ Power
n
<
OVRPWR5
D1 D1 D2 D2 D2
OVRPWR3 ≤ Power
n
<
OVRPWR4
SR SR D1 D2 D2
OVRPWR2 ≤ Power
n
<
OVRPWR3
SR SR SR D1 D1
OVRPWR1 ≤ Power
n
<
OVRPWR2
Norm Norm Norm SR SR
Power
n
< OVRPWR1 Norm
12.7.8 Outdoor Coil Deicing Protection
In the deicing protection, IFAN is forced OFF.
12.7.8.1 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<-4 AND TLD> 100 minutes
•
Case 3: OCT is Invalid AND TLD > DI
•
Case 4: Unit is just switched to STBY AND OCT<-DST
•
Case 5: compressor is stopped during heating operation, OCT<-DST AND TLD>DI,
OCT – Outdoor Coil Temperature
OAT – Outdoor Air Temperature
TLD – Time from Last Deicing
DI – Deicing Interval (Time Interval Between Two Deicing)
DT- Deicing Time