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Page 4

LAARS Heating Systems Company

1L. Oil

Use only No. 2 Heating Oil. Do not use gasoline,

crankcase draining or any oil containing gasoline.

1M. Oil Storage and Pipe Layout

(See Figures 3 and 4)

Figure 3: One-pipe system - pipe and tank layout.

Figure 4: Two-pipe system - pipe and tank layout.

1N. Electrical Connections

All electrical wiring must conform to local codes

and/or the National Electrical Code ANSI / NFPA No.

70 - Latest Edition. The system must be electrically

grounded in accordance with the requirements of the

authority having jurisdiction or, in the absence of such

requirements, with the National Electrical Code

mentioned above.

1O. Operation

(using Honeywell L.8124A
aquastat relay)

A call for heat from the room thermostat causes

the relay to “make” the burner circuit and also feed

the circulator, provided the boiler water temperature is

above the low limit setting (usually 190° to 210°F).

The burner and circulator then continue to run until

the room thermostat is satisfied.

A high limit switch shuts off burner in the event

of water temperature exceeding the high limit setting,

usually 20° to 30°F above the low limit setting.

The low limit switch and circulator maintain

boiler water temperature for domestic hot water

service and prevents circulation of heating system

water if domestic water is not hot enough.

1P. Domestic Water Piping

Connect hot water tempering valve (12) “HOT”

port to hot water outlet from unit. This valve  should

be mounted 8" to 12" below the outlet and set  for

120°F mixed delivery temperature or as local codes

dictate.

Connect gate or shutoff valve (13) to tempering

valve (12) “MIX” port, and cold water inlet.

Connect pressure relief valve (11) (if required by

codes), maximum 150 PSI as close to the unit  as

possible. No other valves or restrictions may be

installed between the DHW coil and the relief valve.

(DO NOT USE A TEMPERATURE/

PRESSURE RELIEF VALVE AS THIS IS NOT A

STORAGE HOT WATER HEATER).

SECTION 2.
Maintenance

WARNING

Flue gases are dangerous - do not operate boiler if
there is an escape of flue gas.  Call a qualified
serviceman and have the entire flue and venting
system inspected.

2A. Cleaning the Boiler

To maintain the high thermal efficiency and a

long life from your boiler, it should be cleaned at least

once a year, preferably at the end of the heating

season.  This is particularly important as rusting can

occur when the boiler is idle.

It is recommended that a service contract be

arranged with a properly equipped serviceman who

will be able to do the job efficiently and without mess.
1.

Switch off electrical supply to the boiler.

2.

Remove front cleaning cover.

3.

Remove flue baffles and thoroughly brush out

flue tubes.

4.

Remove flue deposits from flue collector box

using a vacuum nozzle through side cleaning

ports.

5.

Vacuum out accumulated deposits from

combustion chamber through cleaning cover

opening.

6.

Replace all parts, ensuring flue baffles are

correctly located and cleaning cover is tightly

sealed.

2B. Cleaning the Chimney

Sweep all soot deposits from chimney and

smoke-pipe once a year, preferably at the end of the

heating season.  It is also advisable to inspect the

chimney and smoke-pipe at the beginning of heating

season as birds may have built their nest inside or

other material may be causing a blockage.

2C. Servicing the Burner

This should only be carried out by a trained and

licensed service technician in accordance with the

burner maker’s instructions.

B

O

I

L

E
R

11

12

13

8 - 12"

Figure 1.

OUT OF

PRODUCTION

Содержание Horizon

Страница 1: ...lue gases which could cause serious injury property damage or death Improper installation and or operation will void the warranty WARNING If the information in this manual is not followed exactly a fi...

Страница 2: ...Draft Requirements 3 1I Jacket normally fitted 3 1J Oil Burner normally fitted 3 1K Boiler Controls normally fitted 3 1L Oil 4 1M Oil Storage and Pipe Layout 4 1N Electrical Connections 4 1O Operatio...

Страница 3: ...ction 4g 1C Boiler Installation For recommended installation practice reference should be made to the National Fire Protection Standard for Oil Burning Equipment NFPA 31 Latest Edition 1D Boiler Locat...

Страница 4: ...onnect pressure relief valve 11 if required by codes maximum 150 PSI as close to the unit as possible No other valves or restrictions may be installed between the DHW coil and the relief valve DO NOT...

Страница 5: ...ise on the most satisfactory method of cleaning or whether a replacement coil is necessary 2E Coil Removal 1 Switch off electrical supply and turn off water to boiler 2 Drain the complete system 3 Dis...

Страница 6: ...me Observation Glass CO2 and Draft Test Plug Flame Retention Oil Burner Glass fiber Rope for positive gas tight seal Flame Reverse Combustion Vent Pipe Hydronic Supply with dip tube Heavy gauge Enamel...

Страница 7: ...ve Fitting Alternate Hydronic Return 1 Figure 3 Supply Pipe Vent Relief Valve Tridicator N P T Aquastat Relay L8124A N P T Wiring Conduit to Circulator Oil Burner Draft Regulator and Smoke Pipe not su...

Страница 8: ...2 84 4 Firing Rate G P H 85 1 1 25 1 50 1 75 2 00 2 25 2 50 Net Stack Temperature 333 371 319 354 325 350 330 360 Water Capaqcity Gal 21 21 34 34 42 42 48 48 Coil Capacity G P M 5 5 5 5 5 5 5 5 Appro...

Страница 9: ...pe System Figure 6 Two Pipe System WARNING The height should not exceed 13 feet WARNING The vacuum must not excedd 11 44 HG 11 44 inches of Mercury Burner is shipped from the factory set up for two pi...

Страница 10: ...g Operation of Boiler and Circulator Power supply provides disconnect means overload protection as required 24V Room Thermostat 1K L1 Hot Power Supply 120V L2 Circulator Switch Low Limit Circulator Hi...

Страница 11: ...ly 145 175 59 090 Burner Door Assembly 145 175 59 136 Flue Cover Assembly 145 175 Part Number Description Size 59 170 Front Panel Assembly 145 175 59 164 Left Panel Assembly 145 175 59 154 Right Panel...

Страница 12: ...Service Advisors 20 Industrial Way Rochester NH 03867 603 335 6300 Fax 603 335 3355 1869 Sismet Road Mississauga Ontario Canada L4W 1W8 905 238 0100 Fax 905 366 0130 www Laars com Litho in U S A Laars...

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