SM YAZE218 1-A.2 GB | 11—15
11—CONTROL SYSTEM
11.5.10 ODU Protections
There are 3 ODU protections:
●
Compressor overheating
●
Heat sink overheating
●
System over power
Operation logic of all protections is the same. The controlled input (CTT, HST, or PWR) is
controlled by changing the protection level using the fuzzy logic algorithm according the input
level and the change rate.
There are two sets of POWER values, the selection of the values are set according to the state
of the Power-Shed dry contact input.
Power-Shed input open 7 Power1
Power-Shed input sort 7 Power2
The following table summarizes the basic levels of each protection.
Protection level Comp Overheat
(CTT)
Heat Sink
(HST)
Power1
Power2
Stop compressor
105
84
2800
2100
Down 2
100
80
2650
1988
Down 1
95
77
2500
1875
Stop rise
90
74
2350
1763
Normal
85
71
2350
1763
11.5.10.1 Total Protection Level De nition
The total protection level is de ned by the higher level of protection received.
11.5.11 Deicing
11.5.11.1 Deicing Starting Conditions
Deicing operation will start when either one of the following conditions exist:
Case 1: OCT < OAT – DST AND TLD > DI
Case 2: OCT < OAT – 12 AND TLD > 30 minutes.
Case 3: OCT is Invalid AND TLD > DI
Case 4: Unit is just switched to STBY AND OCT < OAT – DST
Case 5: NLOAD = 0 AND OCT < OAT - DST
Case 6: OAT is invalid AND OCT< DST AND TLD > DI AND Compressor ON Time > CTMR minutes
OCT – Outdoor Coil Temperature
OAT – Outdoor Air Temperature
TLD – Time from Last Deicing
DI – Deicing Interval (Time Interval between Two Deicing)
DST – Deicing static threshold (Temperature)
Deicing interval time when compressor is rst 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.
Summary of Contents for YAZE218
Page 11: ...4 1 SM YAZE218 1 A 2 GB 4 OUTLINE DIMENSIONS 4 OUTLINE DIMENSIONS 4 1 Indoor Unit HJD009 012 ...
Page 25: ...6 2 SM YAZE218 1 A 2 GB 6 OPERATING CURVES 6 1 2 Heating Technician Mode ...
Page 26: ...SM YAZE218 1 A 2 GB 6 3 6 OPERATING CURVES 6 1 3 Tubing Length correction Factor ...
Page 28: ...SM YAZE218 1 A 2 GB 8 1 8 WIRING DIAGRAMS 8 WIRING DIAGRAMS 8 1 YAZE218 Wiring Diagrams ...
Page 29: ...8 WIRING DIAGRAMS 9 1 SM YAZE218 1 A 2 GB 9 REFRIGERATION DIAGRAMS 9 1 YAZE218 Cooling Mode ...
Page 30: ...8 WIRING DIAGRAMS SM YAZE218 1 A 2 GB 9 2 9 2 YAZE218 Heating Mode ...
Page 77: ...14 1 SM YAZE218 1 A 2 GB 14 APPENDIX A 14 APPENDIX A INSTALLATION AND OPERATION MANUAL ...
Page 78: ...SERVICE MANUAL YAZE218 ...