Lochinvar 80 - 285 User Manual download pdf (Page 32)

Installation & Operation Manual

6 Hydronic piping

System water piping methods

The Knight is designed to function in a closed loop

pressurized system not less than 12 psi. A temperature and

pressure gauge is included to monitor system pressure and

outlet temperature and should be located on the boiler outlet.

It is important to note that the boiler has a minimal amount

of pressure drop and must be figured in when sizing the

circulators. Each boiler installation must have an air

elimination device, which will remove air from the system.

Install the boiler so the gas ignition system components are

protected from water (dripping, spraying, etc.) during

appliance operation for basic service of circulator

replacement, valves, and others.

Observe a minimum of 1 inch clearance around all

un-insulated hot water pipes when openings around the pipes

are not protected by non-combustible materials.

Low water cutoff device

On a boiler installed above radiation level, some states and

local codes require a low water cutoff device at the time of

installation.

Chilled water system

If the boiler supplies hot water to heating coils in air handler

units, flow control valves or other devices must be installed to

prevent gravity circulation of heater water in the coils during

the cooling cycle. A chilled water medium must be piped in

parallel with the heater.

Freeze protection

Freeze protection for new or existing systems must use glycol

that is specially formulated for this purpose. This includes

inhibitors, which prevent the glycol from attacking the

metallic system components. Make certain to check that the

system fluid is correct for the glycol concentration and

inhibitor level. The system should be tested at least once a

year and as recommended by the producer of the glycol

solution. Allowance should be made for the expansion of the

glycol solution in the system piping.

3. Install purge and balance valve or shutoff valve and drain

on system return to purge air out of each zone.

4. Install a backflow preventer on the cold feed make-up water

line.

5. Install a pressure reducing valve on the cold feed make-up

water line, (15 psi nominal). Check temperature and

pressure gauge (shipped separately), which should read a

minimum pressure of 12 psi.

6. Install a circulator as shown on the piping diagrams in this

section. Make sure the circulator is properly sized for the

system and friction loss.

7. Install an expansion tank on the system supply. Consult the

tank manufacturer’s instruction for specific information

relating to tank installation. Size the expansion tank for the

required system volume and capacity.

8. Install an air elimination device on the system supply.

9. Install a drain valve at the lowest point of the system.

Note: The boiler cannot be drained completely of water

without purging the unit with an air pressure of 15 psi.

10. This appliance is supplied with a relief valve sized in

accordance with ASME Boiler and Pressure Vessel Code,

Section IV (“Heating Boilers”). Pipe the discharge of the

safety relief valve to prevent injury in the event of pressure

relief. Pipe the discharge to a drain. Provide piping that is

the same size as the safety relief valve outlet. Never block

the outlet of the safety relief valve.

See the *piping illustrations included in this section, FIG.’s 6-4

thru 6-9 for suggested guidelines in piping the Knight boiler

with either zone valves or circulator pumps.

*Please note that these illustrations are

meant to show system piping concept only,

the installer is responsible for all equipment

and detailing required by local codes.

Use only inhibited propylene glycol

solutions, which are specifically

formulated for hydronic systems. Ethylene

glycol is toxic and can attack gaskets and

seals used in hydronic systems.

 WARNING

NOTICE

General piping information

Basic steps are listed in this section along with illustrations on

the following pages (FIG.’s 6-4 thru 6-9), which will guide you

through the installation of the Knight boiler (reference

FIG.’s 6-2A and 6-2B).

1. Connect the system return marked “Inlet”, make sure to

install with pipe sealant compound.

2. Connect the system supply marked “Outlet”, make sure to

install with pipe sealant compound.

Relief valve and temperature and pressure

gauge installation

Basic steps are listed below to guide you through the installation

of the relief valve and the temperature and pressure (T & P)

gauge provided with the unit.

1. Install the tee with the 3/4 inch fitting positioned

vertically and on the top as shown in FIG. 6-1.

2. Install the relief valve into the 3/4 inch fitting of the tee

installed in Step 1 (FIG. 6-1).

3. Install a field provided close nipple and tee with the fitting

positioned vertically on the top on the downstream

side of the relief valve (see FIG. 6-1).

4. Install the temperature and pressure gauge provided with

the unit into the top fitting of the tee (a bushing may be

necessary) installed in Step 3 (FIG. 6-1).

 WARNING

The relief valve, tee and any necessary

fittings are shipped in the install kit with the

boiler and are to be field installed (FIG. 6-1).

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Lochinvar 80 - 285 User Manual Page 32

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