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lp-548 Rev. 000 Rel. 004 Date 1.11.19

11

Register 40003/AV2 needs to receive the rate 

command as follows: Acceptable range is 0 to 

100. Value needs to be greater than 15 for the 

appliance to fire.

When the command is 16, the appliance will 

run at minimum fan speed (firing rate). When 

the command is 100 the appliance will run at 

max fan speed (firing rate) If the command 

value is anywhere between 16 and 100, the 

appliance will run at a fan speed proportional 

to the command sent between minimum and 

maximum firing rates.

NOTE: 

To ensure proper operation, resend the 

configuration bits to holding register 40001 / 

AV0 prior to issuing a command.

Figure 6 - Firing Rate Curve

E. Example #4 - Hot Water Generation

Hot water generation can be accomplished 

using one of two methods when an appliance is 

Holding Registers

Definition

BACnet Decimal 

Value

MODBUS Decimal 

Value

HEX Value

Action

40001 / AV0

Configuration

26

26

001A

Set configuration to read 40002, 4 and 5

40002 / AV1

Coils

16

16

0010

Enables Tank Tstat (00 00 disables appliance)

40004 / AV3

Tank setpoint

130.0

1300

82

Sets setpoint to 130.0F

40005 / AV4

Tank 

temperature

150.5

1505

96

Passes tank temp from remote sensor (ex: 150.5F) to tank

Table 17 - Example #3

NOTE: 

To ensure proper operation, resend the configuration bits to holding register 40001/AV0 prior to issuing a command. For proper 

hexadecimal conversion of rate percentage, please refer to the rate and temperature conversion section of this manual.

To ensure that the appliance can properly respond to a call for hot water generation, the following holding registers must be set in addition 

to other commands:

*The appliance will not respond to the internal DHW limit while the Tank Temperature AND Tank Enable is being written from 

MODBUS/BACnet!

connected to a BMS system, DHW with direct control, and DHW with remote control.

DHW with Direct Control

This is the typical installation with a hot water generator in close proximity to the appliance with the tank thermostat, or tank temperature 

sensor, wired to the terminal strip or Customer Connection Board of the appliance.

DHW with Remote Control

This installation may or may not have the hot water generator in close proximity to the appliance. Its sensors and thermostat values are only 

available through the MODBUS communication bus.

F. Cascade

In order to operate the appliance in cascade with MODBUS or BAC/net communications, configure the master appliance. Connect the 

remaining appliances in the cascade through the normal cascade communications wiring. Cascade control can then be accomplished 

automatically through the master appliance.

NOTE: With MODBUS or BAC/net communication connected only to the master appliance, only total cascade information can be seen 

through the communications link. Information from the follower appliances is limited to follower appliance rate command, supply 

temperature, fault code, and fault status.

If you want to see complete data from each follower, or use the master to control cascading of multiple appliances, each appliance will need 

a MODBUS or BAC/net communication board. If this is implemented, remember that each appliance will present its data as Appliance 1. You 

must then use the Appliance’s address to determine which follower you are accessing.

G. Temperature Conversions (MODBUS Only)

The MODBUS adapter passes temperature data to the appliance in degrees Fahrenheit. Also, to accommodate decimal places, the decimal 

value must be divided by 10. 

In some BMS systems, the data sent over the MODBUS is passed as an unsigned 16-bit integer (16BIT UINT). This poses no problem unless the 

data becomes negative, such as temperatures below zero. In this case, the compliment has to be calculated as follows:

Example for WRITING negative temperature values to the appliance:

Temperature to be sent over MODBUS = -22

o

F.

First multiply by 10-22 X 10 = -220.

Calculate compliment 65536-220 = 65316. Data to be sent is a decimal value of 65316.

Summary of Contents for 7350P-636

Page 1: ...s or to important product information CAUTION used without the safety alert symbol indicates a potentially hazardous situation which if not avoided may result in property damage Table of Contents Part 1 General Information 2 A What s in the Box 2 B Minimum System Requirements 2 C Definitions 2 Part 2 Installation 2 A BMS Wiring Requirements 3 B Jumper Setting 3 Part 3 Communication Configuration 4...

Page 2: ... protocol developed by AEG Modicon Baud Baud Rate Number of data bits transmitted per second bps MSB Most Significant Byte BMS Building Management System RS232 RS232 serial full duplex FDX transmission of data standard EMS Energy Management System RS485 RS485 serial transmission of data standard FDX Full Duplex RTU Remote Terminal Unit HDX Half Duplex PG Industry Standard liquid tight wiring entry...

Page 3: ...S BACnet adapter inside the appliance housing Doing so may affect appliance operation or damage the MODBUS BACnet adapter A BMS Wiring Requirements RS 485 Communication Bus Maximum length 4000 feet Cable specification 24 AWG A B twisted pair and GND shielded with characteristic impedance 120 ohm Maximum load 32 units 32 nodes Wires will be passed through the PG connector on the side of the adapter...

Page 4: ...h the RS485 address of 31 will have a device ID of 600031 NOTE MODBUS must be enabled on the appliance as outlined above for the following parameters to be viewed and changed The BACnet address space is comprised of 256 addresses These are defined as follows Address 255 is a broadcast address The master can send data to address 0 and all followers will process the data Addresses 0 127 are free to ...

Page 5: ... 5 Final Baud Rate Settings E Parity and Stop Bits NOTE This setting only applies to MODBUS operation The BACnet protocol does not utilize parity for communication and this setting will have no effect The parity stop bits parameter of the MODBUS BACnet adapter must be set to match the rest of the devices on the bus Although it is common to set serial devices to use no parity setting the parity to ...

Page 6: ...XCEPT Versa Hydro Alarm output BI 33 1 on 0 off 1 10035 CH pump 1 N A BI 34 1 on 0 off 1 10036 DHW pump 1 N A BI 35 1 on 0 off 1 10038 Gas valve 1 Gas valve BI 37 1 on 0 off 1 10039 Sys pump N A BI 38 1 on 0 off 1 10049 Boiler 1 Run same as 11118 Run status BI 48 1 on 0 off 1 10050 Boiler 2 Run same as 10023 N A BI 49 1 on 0 off 1 10051 Boiler 3 Run N A BI 50 1 on 0 off 1 10052 Boiler 4 Run N A BI...

Page 7: ...utlet 3 N A AI 25 Deg F 0 1 30027 Boiler 3 Firing Rate N A AI 26 1 30028 Boiler 3 Status N A AI 27 N A 1 30029 Boiler 3 Lockout N A AI 28 N A 1 30030 Boiler Outlet 4 N A AI 29 Deg F 0 1 30031 Boiler 4 Firing Rate N A AI 30 1 30032 Boiler 4 Status N A AI 31 N A 1 30033 Boiler 4 Lockout N A AI 32 N A 1 30034 Boiler Outlet 5 N A AI 33 Deg F 0 1 30035 Boiler 5 Firing Rate N A AI 34 1 30036 Boiler 5 St...

Page 8: ...Table 8 MODBUS and BACnet Memory Map Only Valid Valves During Heating Cycle Address 40001 AV0 contains configuration bits sent from the BMS to the appliance These bits tell the appliance to use its own internal inputs or inputs from the BMS When a bit is set to 1 the appliance will ignore the corresponding value contained internally and expect the BMS to write that value into the holding registers...

Page 9: ...rs Definition Decimal Value HEX Value Action 40001 AV0 Configuration 3 0011 Set configuration to read 40002 40002 AV1 Coils 1 0001 Enables CH Demand 00 00 disables demand boilers only 40002 AV1 Coils 16 0010 Enables DHW demand on appliance 00 00 disables demand 40002 AV1 Coils 17 0011 Enables both CH and DHW demand DHW demand will have priority Table 10 Example 1 Holding Registers Definition Decim...

Page 10: ...with the setpoint controlled by the 600 menu parameter CENTRAL HEAT on appliances or the PHOENIX setting in the water heater user menu If the command value is anywhere between 16 and 100 the appliance will run at a setpoint proportional to the command sent between minimum and maximum setpoints NOTE To ensure proper operation resend the configuration bits to holding register 40001 AV0 prior to issu...

Page 11: ... the typical installation with a hot water generator in close proximity to the appliance with the tank thermostat or tank temperature sensor wired to the terminal strip or Customer Connection Board of the appliance DHW with Remote Control This installation may or may not have the hot water generator in close proximity to the appliance Its sensors and thermostat values are only available through th...

Page 12: ... No Burner Control Communication 0 5 seconds on 1 5 seconds off No MODBUS BACnet Communication 1 5 seconds on 0 5 seconds off Figure 7 MODBUS BACnet Diagnostic LEDs B Physical Layer 1 Adapter and Serial Port a Ensure adapter is plugged into the correct four pin connector i It plugs into the WHITE connector on the BIC 926 control ii It plugs into the BLACK connector on the BIC 928 control C Communi...

Page 13: ...19 Water Low 2 34 None 5 Blocking Temperature 20 Water High 2 35 Service Pump 6 DHW Function Internal 21 CH On Off Thermostat 40 Lockout 7 DHW Function Internal 22 CH Zone Demand 51 Frost Protection Pump 8 DHW Indirect 23 CH Cascade Demand 52 Frost Protection Burner 9 DHW Direct 24 CH Pool Demand 60 Summer Kick 10 DHW Phoenix 25 CH 61 Save EEPROM Blocking 11 DHW Spa 26 CH 96 Running 12 DHW 27 CH 1...

Page 14: ...ing 186 ECS7 Temperature Lockout 233 F09 No Flame After Ignition 190 F05 S1 Maximum Temperature 235 APS Stuck Closed 191 F06 S2 Maximum Temperature 236 APS Stuck Open 192 S1 Shorted 237 F11 False Flame 193 F02 S1 Interrupted 239 F01 Safety Thermostat Open 194 S2 Shorted 240 F00 Flue Thermostat Open 195 S2 Interrupted 241 External LWCO 196 Low Water Lockout 243 Gas Pressure 197 Flue Sensor Shorted ...

Page 15: ...ty Wizard http www htproducts com Warranty Wizard html to check warranty eligibility You may also contact HTP Technical Support at 1 800 323 9651 for questions or assistance Warranty coverage requires review and approval of the issue with HTP Technical Support or through the Warranty Wizard prior to a full unit replacement Any claim for warranty reimbursement will be rejected if prior approval fro...

Page 16: ...lp 548 Rev 000 Rel 004 Date 1 11 19 16 Installation and Maintenance Notes ...

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