Lochinvar 000 - 500 User Manual

1.

Check all local codes.

2.

For serviceability of the boiler, always install
unions.

3.

Always pipe pressure relief valves to an open
drain.

4. 

Locate system air vents at the highest point of  the
system.

5.

Expansion tank must be installed near the boil er
and on the suction side of the pump.

6.

Support all water piping.

Filling the System: All air must be purged from the
system for proper operation.  An air scoop and air vent
must be located close to the boiler outlet and there
should be a minimum distance between the cold water
feed and the system purge valve.

1.    Close all drain cocks and air vents.

2.    Open the makeup water valve and slowly fill the

system.

3.    If a makeup water pump is employed, ad just the

pressure to provide a minimum of 12 psi at the
highest point in the system.  If a pressure regulator
is also installed in the line, it should be adjusted to
the same pressure. 

4.

Close all valves.  Purge one circuit at a time as
follows:

A. Open one circuit drain valve and let the water

drain for at least five minutes.  Ensure that
there are no air bubbles visible in the wa ter
stream before closing the drain valve.

B. Repeat this procedure for each circuit.

5.

Open all valves after all circuits have been purged.
Make sure there are no system leaks.

6.

Run the system circulating pump for a min i mum of
30 minutes with the boiler turned off.

7.

Open all strainers in the system and check for
debris.

8.

Recheck all air vents as described in step 4,
General Plumbing Rules.

9.

Inspect the liquid level in the expansion tank.  The
system must be full and under normal operating
pressure to ensure proper water level in the
expansion tank.  Ensure that diaphragm type
ex 

pan 

sion tanks are properly charged and not

water logged.

45,000                              1.9                               

75,000                               3.1                                        

90,000                               3.7                                        

135,000                               5.6                                        

180,000                               7.4                               

215,000                               8.9                                        

260,000                             10.7                                        

315,000                             13.0                               

360,000                             14.9                                        

399,999                             16.5                                        

500,000                             20.7  

Input Btu/hr

GPM Flow

Minimum flow is based on a 40°F tem per a ture rise
across the boiler.  Minimum flow may not prove a
flow switch installed in the boiler piping.  Use care
when operating a boiler at or near the min 

i 

mum

recommended flow because conditions unique to the
installation (system pressure, operation of multiple
zone valves, glycol, variations in flow, etc.,) may
result in overheating of the boiler water caus 

ing

noise or nui 

sance operation of safety limit 

con trols.  Typical heat ing boiler applications will
op er ate with a 20°F to 30°F temperature rise across
the boiler.

Do not use petroleum based stop leak products.  All
system leaks must be repaired.  The constant
addition of make-up water can cause damage to the
boiler heat exchanger due to scale accumulation.
Scale reduces flow and heat transfer, causing
overheating of the heat exchanger.