Lochinvar BMS Assembly Instructions

LV 311273 | June 2022
0311273 R2.1 / 2622 - Changes Reserved
Installation, Commissioning &
User Instructions
BMS Interface

These instructions must be read and understood before installing, commissioning, operating
or maintaining the equipment.
IMPORTANT INFORMATION
!

3
Read this manual
carefully
Trademarks
Liability
More information
Warning
Read this manual carefully before starting the BMS Interface. Failure to read the manual
and to follow the printed instructions may lead to personal injury and damage to the BSM
Interface, water heater or any other equipment.
Copyright © 2013
All rights reserved.
Nothing from this publication may be copied, reproduced and/or published by means of
printing, photocopying or by whatsoever means, without the prior written approval of the
supplier.
The supplier reserves the right to modify specifications stated in this manual.
Any brand names mentioned in this manual are registered trademarks of their respective
owners.
The supplier accepts no liability for claims from third parties arising from unauthorised
use, use other than that stated in this manual, and use other than in accordance with the
General Conditions registered at the Chamber of Commerce.
Refer further to the General Conditions. These are available on request, free of charge.
Although considerable care has been taken to ensure a correct and suitably
comprehensive description of all relevant components, the manual may nonetheless
contain errors and inaccuracies.
Should you detect any errors or inaccuracies in the manual, we would be grateful if you
would inform us. This helps us to further improve our documentation.
If you have any comments or queries concerning specific aspects related to the BMS
Interface, then please do not hesitate to contact the supplier of the BMS Interface.
In the event of problems with your electricity or water supply connections, please contact
the supplier/installation engineer of your installation.

Installation, Commissioning & User Instructions
4
Content
1
1.1
1.2
2
2.1
2.2
2.3
3
4
4.1
4.2
5
5.1
5.2
5.3
6
6.1
6.2
Lay-out .......................................................................................................................... 5
Introduction ..................................................................................................................... 5
Lay-out ........................................................................................................................... 5
Mounting and Installing ............................................................................................... 6
Introduction ..................................................................................................................... 6
Mounting ......................................................................................................................... 6
Connecting ..................................................................................................................... 6
Settings ......................................................................................................................... 9
Data readout ................................................................................................................. 10
Introduction .................................................................................................................... 10
Parameters ................................................................................................................... 11
Errors ........................................................................................................................... 13
Introduction ................................................................................................................... 13
Lock-out codes ............................................................................................................. 14
Blocking codes .............................................................................................................. 14
Status .......................................................................................................................... 15
Introduction ................................................................................................................... 15
Status water heater ...................................................................................................... 15

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1 Lay-out
1.1 Introduction
1.2 Lay-out
The BMS Interface is an interface that is used to connect a building management system
(BMS) to the control of a EcoCharger. The communication, between the BMS and the
EcoCharger, will be handled via a Modbus communication protocol and is meant for
reading the data of the connected water heater. The BMS Interface does not have its
own display or push buttons.
Schematic sketch BMS Interface
IMD-1155 R0.0
The BMS Interface will be supplied as in the pictured below, with a black plastic housing.

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2 Mounting and Installing
2.1 Introduction
2.2 Mounting
2.3 Connecting
This chapter covers the following topics:
• Mounting the BSM Interface;
• Connecting the BMS Interface between the water heater and BMS.
The BMS Interface is supplied with the following components:
- power supply cable;
- communication cable to connect the BMS Interface to the control of the water heater;
- communication cable to connect the BMS Interface to the building management
system (Modbus).
Note
Mount the BMS Interface near the water heater.
The BMS Interface should be mounted in the following way:
1. Remove the cover of the BMS Interface
2. Mount the rear side of the BMS Interface to the wall with fitting plugs.
The BMS Interface should be connected to the BMS and water heater in the following
way:
1. Connect the power supply cable to the connector
on the upper right side of the BMS Interface.
Connect the other side of the cable to the mains
power supply by using a double-pole isolator.
Note
Fit cable in the strain relief.
Attention
Do not power up the system until all the electrical
connections have been made.
2. Connect the communication cable to the water
heater, via the pull relief, to the two way connector
on the lower right side of the BMS Interface.
Note
Fit cable in the strain relief.

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3. Connect the communication cable to the BUS link
connections (X5 and X6) on the far right side of
the electrical connection box on top of the water
heater.
Note
Fit cable in the strain relief.
Max. length communication cable
It is possible to select another, longer
communication cable for the communication
between the BMS Interface and the water heater.
The maximum length of the cable depends on the
cable diameter, see the table.
Cable diameter
[mm2]
Max. cable length
[m]
0,25 100
0,50 200
0,75 300
1,00 400
1,50 600
4. Connect the communication cable, for Modbus connection to the two connectors on
the lower side of the BMS Interface.
Note
Fit cable in the strain relief.
Attention
First connect the twelve way connector containing the ground wire, next the four way
connector can be connected.
5. Connect the Modbus communication cable
to the BMS in the required way. For this
purpose use the connectors which are
supplied together with the BMS Interface.
Note
Fit cable in the strain relief.

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6. Connect the cable from the BMS to the supplied contra connector. First lead the
cable through the strain relief. This three wire cable (2 wires + PE) is not supplied
with the BMS Interface. Make sure that the wires are connected in the right
sequence.
Attention
For optimal communication between the BMS Interface and the BMS, the cable must be
shielded twisted pair with a maximum length of 1200 meters.
7. Finally, place the supplied clip over the connector and use this to lock both connector
parts. All the wiring has now been connected properly.
1 = brown  Modbus 1 - Tx+
2 = white  Modbus 1 - Tx-
3 = yellow/green  Earth

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3 Settings
To approach the BMS Interface, from the BMS, some settings need to be made in order
to make the communication possible.
Setting Value
Type Modbus RTU
Baud rate 9600
Initial address 247
Data bits 8
Parity None
Stop bits 1

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4 Data readout
4.1 Introduction
The BMS Interface supplies data, in a Modbus format, to the BMS. The user will receive
this data and needs to process this. The attached parameter list can be used.
Pay special attention to some of the data that has to be converted into the wright format
before receiving the expected values. The required conversions are also a part of the
table given on the next page.
ATTENTION:
The parameters mentioned in the table are all of the type “read only”. The only exception
is parameter 0, which is “read/write”.

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4.2 Parameter list
Para-
meter
Register
type Value Type Unit Description Conversion
y = first byte
x = second byte
Setting
0 03 16 bits direct Address - Actual Modbus address BMS Interface - Yes
1 03 16 bits direct Temperature °C Temperature in the top of the water heater x/100 Yes
2 03 16 bits direct Temperature °C Temperature in the bottom of the water heater x/100 Yes
3 03 16 bits direct Temperature °C Flue gas sensor (dummy) x/100 n.a.
4 03 16 bits direct Temperature °C Set point water heater x/100 Yes
5 03 16 bits direct Delta T K Hysteresis up gas burner x/256 Yes
6 03 16 bits direct Delta T K Hysteresis down gas burner x/256 Yes
7 03 16 bits direct State - Unit state - Yes
8 03 16 bits direct Relay - Relay: Potable water pump 1=Closed, 0=Open Yes
9 03 16 bits direct Burning hours Hours Burning hours water heater - Yes
10…14 03 16 bits direct Error - Last 5 lock outs (internal codes) - Yes
15…19 03 16 bits direct Error - Last 5 blocking errors (internal codes) - Yes
20 03 16 bits direct Error - Actual error code (internal code) - Yes
21 03 16 bits direct Relay ON/OFF Relay: External ON / OFF 1=Closed, 0=Open Yes
22 03 16 bits direct Solar State - State solar control - n.a.
23…27 03 16 bits direct Error - Last 5 solar errors (internal codes) - n.a.
28 03 16 bits direct Temperature °C Temperature solar collector (S1) x/100 n.a.
29 03 16 bits direct Temperature °C Solar temperature in the bottom of the tank (S2) x/100 n.a.
30 03 16 bits direct Temperature °C Solar temperature in the top of the storage tank (S3) x/100 n.a.

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Para-
meter
Register
type Value Type Unit Description Conversion
y = first byte
x = second byte
Setting
31 03 16 bits direct Temperature °C Solar return temperature of the Q/T sensor (S4) x/100 n.a.
32 03 16 bits direct Temperature °C Temperature limit for solar heating x/100 n.a.
33 03 16 bits direct Contribution Watt Solar contribution; actual - n.a.
34 03 16 bits direct Contribution MJ Solar contribution; last 24h - n.a.
35 03 16 bits direct Contribution GJ Solar contribution; total - n.a.
36 03 16 bits direct Flow l/min Actual flow through the Q/T sensor x/10 n.a.
37 03 16 bits direct Solar pump % Modulation percentage of the solar pump x/2.55
(0…100% = 0…255) n.a.
38 03 16 bits direct Warning ON/OFF Warning Service required ON 1=On, 0=Off Yes
39 03 16 bits direct Day Anti legionella purge; day Sun (=0) … Sat (=6)
Legionella off = 7 Yes
40 03 16 bits BCD Time hh:mm Anti legionella purge; start time y=hh, x=mm Yes
41 03 16 bits BCD Time hh:mm Anti legionella purge; end time y=hh, x=mm Yes
42 03 16 bits direct Temperature °C Anti legionella purge; set point x/100 Yes
43 03 16 bits direct Error - Actual error solar system (internal code) - n.a.
44 03 16 bits direct Warning ON/OFF Warning Anode ON 1=On, 0=Off Yes
45 03 16 bits direct Heat input % Actual heat input in % of the maximum load - Yes
46 03 16 bits direct Relay - Relay: Error activated 1=Closed, 0=Open Yes
47 03 16 bits direct Temperature °C CV setpoint x/100 Yes
48 03 16 bits direct Temperature °C CV temperature x/100 Yes
49 03 16 bits direct Relay - Relay: Heat demand roomthermostat 1=Closed, 0=Open Yes
50

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a
5 Errors
5.1 Introduction
5.2 Lock-out codes
Through the BMS Interface, internal error codes can be viewed. On parameter 20, the
actual error code for lock outs and blocking errors are displayed. Parameters 10 … 14,
15 … 19 and 23 … 27 show the five most recent errors of respectively the lock outs,
blocking errors and solar errors.
These internal codes are not the same code as the texted error that is visible on the
display of the water heater and in the user manual of the water heater. The table below
shows the explanation of these internal codes of the lock-out errors:
Internal code Display
error code Description
0 C02 Internal error control
1 F04 Ignition error (3 attempts)
3 C22 Watchdog error
4 C02 Internal error control
5 C02 Internal error control
6 C02 Internal error control
7 F02 Fan error
8 C02 Internal error control
9 C02 Internal error control
10 F09 Maximum temperature error
11 C02 Internal error control
16 E03 Temperature difference top tank
17 C02 Internal error control
18 F07 Flame error
19 F08 Flame error
22 F05 Flame error
23 F03 APS not closed
24 F03 APS not open
25 F15 Flue gas temperature error
28 E05 Blocking error for 20 hours
255 - No error

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5.3 Blocking codes The table below shows the explanation of the internal codes related to the blocking
errors:
Internal code Display
error code Description
36 C02 Internal error control
37 C02 Internal error control
38 C02 Internal error control
39 C02 Internal error control
40 F11 Flame error
41 E01 Maximum temperature error
42 F01 Reversed phase error
43 C02 Internal error control
44 F06 Ionisation error
45 C02 Internal error control
47 S01 Bottom tank sensor open
50 S04 Flue gas sensor 1 open
52 S05 Flue gas sensor 2 open
53 S02 Top tank sensor 1 open
54 S03 Top tank sensor 2 open
63 S11 Bottom tank sensor shorted
66 S14 Flue gas sensor 1 shorted
68 S15 Flue gas sensor 2 shorted
69 S12 Top tank sensor 1 shorted
70 S13 Top tank sensor 2 shorted
79 C03 Reset error
80 C04 Selection error
82 F19 Supply voltage error
255 - No error

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6 Status
6.1 Introduction
6.2 Status water heater
Via the BMS Interface, the state of the water heater and the solar control can be read out
separately. The actual state of the control of the water heater can be found on parameter
7.
The numbers that will be read out refer to certain states of the control(s). Some states
shall appear and disappear so quickly that they won’t be visible. This is no problem.
In the table beneath, the reference to the numbers is specified:
Code Description
0 Resetting the control
1 Resetting the control
2 Standby, no active burner cycle
3 Pre purge of the fan / unit
4 Pre purge of the fan / unit
5 Pre purge of the fan / unit
6 Check safety devices
7 Check safety devices
8 Ignition of the gas mixture
9 Ignition of the gas mixture
10 Burning is started, unit is heating up
11 Stop signal for burner cycle
12 Stop signal for burner cycle
13 Post purge of the fan / unit
14 Post purge of the fan / unit
15 Error present
16 Error present
17 Internal check of the control
18 Internal check of the control
19 Internal check of the control
20 Internal check of the control
21 Waiting time between states

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0311 273 R2.1 EN

8 Lombard Way, The MXL Centre, Banbury, Oxon, OX16 4TJ
Tel: [phone], Fax:[phone], Email: [e-mail]
www.lochinvar.ltd.uk
Lochinvar Ltd reserves the right to change
specifications without prior notice