Modbus Instructions

4Wiring Requirements

Note that when the System Supply Temperature and/or the Tank Temperature are provided by the BAS, they need to be refreshed every few seconds. This is required in order to prevent unwanted fluctuations in these temperatures. If these values are not provided every few seconds (timeout is programmable), the boiler will revert to its own internal control. If neither of these temperatures is provided by the BAS, but any of the other control signals are being provided, the BAS will still need to refresh these inputs at least every 4 minutes.

Physical Wiring

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)

NOTE: Cable must be terminated with 120 ohm impedance matching resistor on each end.

Figure 4-1_Terminal Strip Connections

 

 

 

 

 

 

 

 

 

 

 

 

8 FLOW SWITCH

 

10 FLOW SWITCH

 

12 THERMOSTAT

 

 

LBL20052 REV B

 

MOD BUS

0 - 10VINPUT

 

 

 

 

 

 

 

CASCADE

 

 

COMMUNICATIONBUS

 

 

 

 

 

 

 

 

1 ALARM

2 CONTACTS

3 RUN TIME

4 CONTACTS

5 LOUVER

6 PROVING

7 HEX 2

9 HEX 1

11 TANK

ENABLE

 

15 SHIELD GND

 

17 B 18 SHIELD GND

21 SYSTEM

22 SENSOR

23 OUT DOOR

24 SENSOR

25 TANK

26 SENSOR

27 SHIELD GND

 

 

30 SHIELD GND

 

 

 

 

 

 

 

 

 

13 R

14 W

16 A

19 (+)

20 (-)

28 B

29 A

 

BOILER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SHIELD

MODBUS

A B TO NEXT

SHIELD

TO NEXT BOILER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A B

 

 

 

SHIELD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SHIELD

PREVIOUS BOILER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FROM

BUILDING

MANAGEMENT

SYSTEM

LOUVER

PROVING

SWITCH

 

HEAT

EXCHANGER 2

FLOW SWITCH

 

 

 

HEAT

EXCHANGER 1

FLOW SWITCH

 

TANK

THERMOSTAT

 

 

 

 

 

ENABLING DEVICE

 

 

 

SYSTEM SENSOR

 

 

 

OUTDOOR SENSOR

 

 

TANK SENSOR

 

 

 

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page 9
Image 9
Lochinvar 1.0- 1.3- 1.5 operation manual Wiring Requirements, Physical Wiring

1.0- 1.3- 1.5 specifications

Lochinvar has long been recognized as a leader in the water heating industry, offering high-efficiency solutions for residential and commercial applications. Among its celebrated products are the Lochinvar 1.0, 1.3, and 1.5 models, which represent a range of advanced technologies and features designed to meet diverse customer needs.

The Lochinvar 1.0 is crafted for residential applications, featuring a robust design that emphasizes energy efficiency and reliability. This model incorporates condensing technology, ensuring that water heating is optimized, resulting in reduced energy costs. With a thermal efficiency rating of up to 95%, the Lochinvar 1.0 significantly lowers fuel consumption while providing ample hot water for households. This model also includes a digital control system that offers precise temperature management, enhancing user convenience.

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All three models feature durable components including stainless steel heat exchangers, enhancing longevity and resistance to corrosion. They also integrate user-friendly interfaces, making them accessible for easy adjustments and monitoring. Additionally, all Lochinvar models are designed with environmental responsibility in mind, contributing to reduced greenhouse gas emissions.

In summary, Lochinvar's 1.0, 1.3, and 1.5 models showcase a commitment to innovation in water heating technology. They offer a blend of efficiency, capacity, and user-friendly features suitable for various applications, making them a wise choice for those in search of reliable hot water solutions.