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ERV
SYSTEM MONITORING
TYPE
#
VARIABLE
DESCRIPTION
RANGE
READ/WRITE
MODE (RET)
InputRegister
20
SF_Command.Val
Supply Fan Command (actual)
%
Read_NoWrite
InputRegister
22
EF_Command.Val
Exhaust Fan Command (actual)
%
Read_NoWrite
InputRegister
24
CO2_Level.Val
CO2 Level
PPM
Read_NoWrite
InputRegister
26
VOC_Level.Val
VOC Level
PPM
Read_NoWrite
InputRegister
28
Space_Press.Val
Space Pressure
iwc
Read_NoWrite
InputRegister
30
Duct_Press.Val
Duct Pressure
iwc
Read_NoWrite
InputRegister
32
CA_Temp.Val
CA Temperature (after tempering) F
Read_NoWrite
InputRegister
34
Cooling_Command.Val
Cooling Command
%
Read_NoWrite
InputRegister
36
Heating_Command.Val
Heating Command from Program
%
Read_NoWrite
InputRegister
98
OA_Temp.Val
OA Temperature
F
Read_NoWrite
InputRegister
42
SF_ControlType_BN
SF_ControlType_BN
(See Notes)
Read_NoWrite
InputRegister
43
EF_ControlType_BN
EF_ControlType_BN
(See Notes)
Read_NoWrite
InputRegister
44
HTG_ControlType_BN
HTG_ControlType_BN
(See Notes)
Read_NoWrite
InputRegister
45
CLG_ControlType_BN
CLG_ControlType_BN
(See Notes)
Read_NoWrite
InputRegister
48
Heating_SetPtType_BN
Heating_SetPtType_BN
(See Notes)
Read_NoWrite
InputRegister
50
UnitStatus_BN
UnitStatus_BN
(See Notes)
Read_NoWrite
12.9.1 Turning the Unit On and OFF
If you plan to use the BMS to turn the unit on and off, make sure you have the control enabled
through the keypad. Use Modbus Coil “OnOffUnitMng.BmsOnOff” at Coil 0. The status can be
read at “UnitOn” at Discrete Input 9.
12.9 MODBUS APPLICATION NOTES
All of the following have to be true in order for the unit to be on:
u
There are no serious alarms.
u
The Digital Input for start/stop (terminals 17 and 18) are closed.
u
The unit is turned on at the keypad.
u
The time is within the scheduler “ON” time, if scheduler enabled.
u
The BMS has written the unit on signal, if BMS control is enabled.