HTP 7350P-636, Installation Instructions Manual

MODBUS / BACnet Adapter Installation Instructions

Part # 7350P-636

For Use with BIC-928 Control Based EnduroTI and Elite Premier Boilers (see page 2 to determine compatibility)

BIC-926 Control Based Modcon, Modcon VWH, Pioneer, and Versa Flame Products Manufactured On or After July 1, 2011,

and BIC-926 Control Based Elite, Elite VWH, and Phoenix Water Heaters Manufactured On or After August 1, 2011

272 Duchaine Blvd.

New Bedford, MA 02745

www.htproducts.com

lp-548 Rev. 000 Rel. 004 Date 1.11.19

STOP! Follow these instructions or warranty will be void!

The manufacturer reserves the right to make changes or updates without notice and will not be held liable for errors in literature.

NOTE TO CONSUMER: PLEASE KEEP ALL INSTRUCTIONS FOR FUTURE REFERENCE.

NOTE: 

Contains additional information important to a procedure.

Foreword

This manual provides guidelines for the use and installation of the MODBUS/

BACnet communication system with HTP appliances.

For the Installer

The installer should be guided by the instructions furnished with the 

MODBUS/BACnet, local codes and utility company requirements. Preference 

should be given to codes and requirements where they differ from the 

This manual must only be used by a qualified heating installer / service 

technician. Read all instructions in this manual before installing. Failure to 

comply could result in property damage or improper appliance operation. 

Such damages or service calls to correct operation ARE NOT covered by 

warranty.

The following defined terms are used throughout this manual to bring 

attention to the presence of hazards of various risk levels 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

A. MODBUS/BACnet Enable 

4

B. MODBUS Address 

4

C. BACnet Address 

4

D. Baud Rate 

5

E. Parity and Stop Bits 

5

Part 4 - MODBUS Registers and BACnet Objects 

5

A. Primary Data Tables 

5

B. Appliance Memory Map 

6

C. Configuration Bits 

8

Part 5 - Appliance Operation 

9

A. Appliance Operation with MODBUS and BACnet

     Communications 

9

B. Example #1 - Enable / Disable CH and DHW Demand 

9

C. Example #2 - Sending DHW Setpoint Via Direct Write Method 

9

D. Example #3 - Sending Setpoint or Firing Rate from BMS 

9

1. Sending Desired Setpoint from BMS to Appliance Via Simulated 0-10V

    Method 

9

2. Send Firing Rate Command from BMS to Appliance 

10

E. Example #4 - Hot Water Generation 

11

F. Cascade 

11

G. Temperature Conversions (MODBUS Only) 

11

Part 6 - Troubleshooting 

12

A. MODBUS/BACnet Board Diagnostics 

12

B. Physical Layer 

12

C. Communications 

12

D. Error Codes 

13

E. Appliance 0-7 Status Codes 

13

F. Appliance 0 and Appliance 1 Blocking Codes 

13

G. Appliance 0-7 Lockout Codes 

14

Communication Adapter Limited Warranty 

15

Installation and Maintenance Notes 

16

furnished instructions.

Additional publications which should guide the installer include:

1. The latest version of the National Electrical Code, NFPA No. 70.

2. In Canada, refer to Canadian Electrical Code C 22.1, from Canadian Standards Association, 5060 Spectrum Way, Suite 100, Mississauga, 

Ontario, Canada L4W 5N6.
3. Local, state, provincial, and national codes, laws, regulations, and ordinances.