Lochinvar 80 - 285 User Manual download pdf (Page 35)

Installation & Operation Manual

6 Hydronic piping (continued)

It is required that near boiler piping

systems utilize Primar y/Secondar y

configurations as shown in FIG.’s 6-4

thru 6-9 only. The use of other near

boiler piping configurations could result

in improper building and system flow

rates leading to inadvertent boiler high

limit shutdowns and poor system

performance.

Near boiler piping components

1. Boiler system piping:

Boiler system piping MUST be sized per the pipe

requirements listed in Table 6A. Reducing the pipe size

can restrict the flow rate through the boiler, causing

inadvertent high limit shutdowns and poor system

performance. Flow rates are based on 20 feet of piping,

4 - 90° elbows, and 2 - fully ported ball valves.

2. Boiler system circulating pump:

A Grundfos UPS26-99F pump will be provided by the

factory as the boiler circulation pump based on 20 feet

of piping, 4 - 90° elbows, and 2 - fully ported ball

valves.

3. Domestic hot water circulating pump:

Field supplied. The pump MUST be sized to meet

the specified minimum flow requirements listed in

FIG. 6-3. Consult the indirect water heater operating

guide to determine flow characteristics for the selected

product used.

4. Boiler isolation valves:

Field supplied. Full port ball valves are required.

Failure to use full port ball valves could result in a

restricted flow rate through the boiler.

5. Check valves:

Field supplied. Check valves are recommended for

installation as shown in FIG.’s 6-4 thru 6-9. Failure to

install check valves could result in a reverse flow

condition during pump(s) off cycle.

6. Domestic indirect hot water isolation valves:

Field supplied. Full port ball valves are required. Failure

to use full port ball valves could result in a restricted flow

rate through the boiler.

7. Anti-scald mixing valve:

Field supplied. An anti-scald mixing valve is

recommended when storing domestic hot water above

115°F.

8. Unions:

Field supplied. Recommended for unit serviceability.

9. Temperature and pressure gauge:

Factory supplied. The temperature and pressure gauge is

shipped loose. It is the responsibility of the contractor to

install the temperature and pressure gauge on the boiler

water outlet.

10. Pressure relief valve:

Factory supplied. The pressure relief valve is sized to

ASME specifications.

11. Boiler purge valve:

Field supplied. The boiler purge valve is used to

remove entrapped air from the heat exchanger during

start-up.

12. System temperature sensor:

Lochinvar supplies a system temperature sensor.

The sensor is to be installed in the heating loop

downstream from the boiler hot water piping and

heating loop junction. Typically the sensor will be

located far enough downstream to sense system diluted

water temperature.

13. Indirect water heaters:

The Knight boiler may be piped to an indirect water heater

to heat domestic hot water with the space heat transfer

medium. As depicted in the piping diagrams on pages 36

thru 41, the space heating piping will branch off to flow

the space heat transfer medium through a single wall heat

exchanger coil inside the indirect water heater.

The Knight boiler is pre-configured to control the

operation of the DHW pump with Domestic Hot Water

Prioritization programming. The DHW programming is

designed to control and balance the space heating demand

with the domestic hot water demand.

Lochinvar offers the Squire which is a series of indirect

water heaters. The Squire features a stainless steel vessel

with a single wall stainless steel heat exchanger.

NOTICE

Pump sizing and flow requirements are

based on 20 feet of piping, 4 - 90°

elbows, and 2 - fully ported ball valves.

NOTICE

 WARNING

The National Standard Plumbing Code, the

National Plumbing Code of Canada and the

Uniform Plumbing Code limit the pressure

of the heat transfer fluid to less than the

minimum working pressure of the potable

water system up to 30 psi maximum. Also,

the heat transfer fluid must be water or other

non-toxic fluid having a toxicity of Class 1,

as listed in Clinical Toxicology of

Commercial Products, 5

Edition.

14. Dirt separator:

Field supplied. A dirt separator or equivalent multipurpose

strainer is recommended at the inlet of the heat exchanger

to remove system particles from older hydronic systems and

protect newer systems.

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