HTP 7350P-636, Installation Instructions Manual

lp-548 Rev. 000 Rel. 004 Date 1.11.19

8

MODBUS

Heating Appliance

Water Heater

BACNET

Address

Description

Description

Object Type Object Instance

Unit

Resolution

Input Registers

Input Registers

30056

Vortex 2 flow

N/A

AI

55

LPM

0.1

30057

Vortex 2 temp

N/A

AI

56

Deg F

0.1

30091

Total Faults

N/A

AI

90

1

30092

Total Last Faults

N/A

AI

91

1

30093

Run Hours CH

AI

92

x5

30094

Run Hours DHW

AI

93

x5

30095

Run Hours Cas CH

N/A

AI

94

x5

30096

Run Hours Cas DHW

N/A

AI

95

x5

30097

Power Hours

AI

96

x5

30099

Start Counter

AI

98

1

30100

Start Counter

AI

99

1

Holding Registers

40001

Configuration

Configuration

AV

0

See 

Configuration 

Bits Section

1

40002

Coils

Coils

AV

1

1

40003

0-10 volt / rate / setp

0-10 volt / rate / set

AV

2

V

0.1

40004

DHW setpoint

DHW set

AV

3

Deg F

0.1

40005

DHW temperatur

DHW temp

AV

4

Deg F

0.1

40006

Outdoor temp.

Outdoor Sensor

AV

5

Deg F

0.1

40007

Sys supply temp.

N/A

AV

6

Deg F

0.1

40008

Sys rtn temp.

N/A

AV

7

Deg F

0.1

40009

I4 for direct

N/A

AV

8

Deg F

0.1

40010

CH post purge

N/A

AV

9

Seconds

1

40011

DHW post purge

N/A

AV

10

Seconds

1

40012

Pump 4 Speed

N/A

AV

11

%

0.1

40014

Extra out ECS

N/A

AV

13

%

0.1

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. The configuration bits are as follows:

C. Configuration Bits

Holding Register 40001 / AV0

Decimal Value

HEX Value

Selected Signal (Register) to Write to

0 = Taken from Control

1 = Taken from MODBUS

B0 (LSB)

1

01

Boiler enable (40002 / AV1)

0/1

B1

2

02

Tank enable (40002 / AV1)

0/1

B2

4

04

Rate command / 0-10V input / setpoint command 

(40003 / AV2)

0/1

B3

8

08

DHW setpoint (40004 / AV3)*

0/1

Holding Register 40001 / AV0

Decimal Value

HEX Value

Selected Signal (Register) to Write to

0 = Taken from Control

1 = Taken from MODBUS

B4

16

10

DHW temperature (40005 / AV4)

0/1

B5

32

20

Outdoor temperature (40006 / AV5)

0/1

B6

64

40

System supply temperature (40007 / AV6)

0/1

B7

128

80

System return temperature (40008 / AV7)

0/1

B8

256

100

I4 offset (40009 / AV8)

0/1

B9

512

200

CH post purge (40010 / AV9)

0/1

B10

1024

400

DHW post purge (40011 / AV10)

0/1

B11

2048

800

Pump 4 speed (40012 / AV11)

0/1

B12

4096

1000

Pump 5 speed (40013 / AV12)

0/1

B13 (MSB)

8192

2000

Extra 0-10V output (40014 / AV13)

0/1