Heatcraft Mohave, Installation & Operation Manual, Page: 73 / 76

73
Last elapsed defrost time (minutes) Word 17
DFTM
Compressor cycles since midnight (0 to 255) Word 18
CCYC
Run time since midnight (0000 to 2359 HHMM) Word 19
RnTM
Elapsed time since last defrost (00000 to 25559 HHHMM) Word 20
ETLD
Run time since last defrost (00000 to 25559 HHHMM) Word 21
RTLD
Holding Registers -
CMD 0x03 (Read), CMD 0x06 (Single Write)
Data Type
Word Addr. Label
CMD 0x10 (Multiple Write)
Display Right char. (7-bit ASCII + 0x80 DP) Word 0
Display Ctr-Right char. (7-bit ASCII + 0x80 DP) Word 1
Display Ctr-Left char. (7-bit ASCII + 0x80 DP) Word 2
Display Left char. (7-bit ASCII + 0x80 DP) Word 3
Time of Day (0000 to 2359 HHMM) Word 4
CLKH CLKM
Pressure Regulator setpoint (0 to 820 steps) Word 5
revised
Refrigerant Type (0=R-22, 1=R-404A, 2=R-507, 3=R-407A, 4=R-407C,
5=R-407F, 6=R-448A, 7=R-449A)
Word 6
REFR
Application Type (0=Low temp, 1=Medium temp) Word 7
APPL
Model Number (500 to 5000) Word 8
MODL
Displayed temperature units (0=degrees F, 1=degrees C) Word 9
øFøC
Displayed time mode (0=12 hour, 1=24 hour) Word 10
1224
Evaporator fan mode if not cooling (0=off, 1=on) Word 11
EVPF
Parameter lock mode (0=unlocked, 1=locked) Word 12
Number of evaporators (1 or 2) Word 13
Evaporator #1 defrost termination temp (+50 to +100 degrees F) Word, signed 14
DFT1
Evaporator #2 defrost termination temp (+50 to +100 degrees F) Word, signed 15
DFT2
Defrost termination pressure (175 to 315 psia), displayed as 160 to 300 psig Word 16
DEFP
Defrost override time limit (5 to 30 minutes) Word 17
DEFT
Alarm condition duration (2 to 120 minutes) Word 18
ALRT
Pressure Regulator full scale (100 to 820 steps) Word 19
PRFS
Equalization time (1 to 10 minutes) Word 20
EQUT
Low Pressure Switch high limit (15 to 45 psia), displayed as 0 to 30 psig Word 21
LPSH
Low Pressure Switch low limit (15 to 45 psia), displayed as 0 to 30 psig Word 22
LPSL
Evaporator re-freeze temperature threshold (+20 to +40 degrees F) Word, signed 23
FZET
Normal valve update interval (10 to 30 seconds) Word 24
PRUI
Initial defrost Pressure Regulator opening (50 to 100%) Word 25
DFIO
Evaporator re-freeze time limit (0 to 10 minutes) Word 26
FZTM
Cooling mode LLS Pulsing time limit (0 to 15 minutes) Word 27
LLSP
ESV/PR valve manufacturer (0=Carel or 1=Alco) Word 28
VALM
CU Aux Room Temperature control (0=off, 1=on) Word 29
AUXT
CU Aux Room Temperature setpoint (-25 to +50 degrees F) Word, signed 30
BOXT
High CU Aux Temp Alarm threshold (-35 to +100 degrees F), +127 if disabled Word, signed 31
ALRH
Low CU Aux Temp Alarm threshold (-35 to +100 degrees F), -128 if disabled Word, signed 32
ALRL
Run-time defrost interval (0030 to 1200 HHMM), 0000 if disabled Word 33
RTDF
Defrost #1 start time (0000 to 2330 HHMM), 2530 if not used Word 34
DF01
Defrost #2 start time (0000 to 2330 HHMM), 2530 if not used Word 35
DF02
Defrost #3 start time (0000 to 2330 HHMM), 2530 if not used Word 36
DF03
Defrost #4 start time (0000 to 2330 HHMM), 2530 if not used Word 37
DF04
Defrost #5 start time (0000 to 2330 HHMM), 2530 if not used Word 38
DF05
Defrost #6 start time (0000 to 2330 HHMM), 2530 if not used Word 39
DF06
Defrost #7 start time (0000 to 2330 HHMM), 2530 if not used Word 40
DF07
Heatcraft Mohave Control Modbus Definitions