Lochinvar 2.5 Manuel D’Utilisation

        

Installation & Operation Manual

 

Boiler system piping should be sized per the pipe 

 

requirements listed in Tables 5A and 5C.    

2.  Boiler circulating pump:
 

Field supplied.  When using Primary/Secondary piping the 

 

boiler circulating pump should be sized per Table 5A.

3.  Hot Water Generator circulating pump:
 

Field supplied.  When installed in a Primary/Secondary 

 

arrangement, the Crest requires an additional pump for 

 

the Hot Water Generator Loop. The pump should 

 

be sized per Table 5A.  Consult the indirect water 

 

heater operating guide to determine flow characteristics 

 

for the selected product used.  The pump’s total flow and 

 

heat requirements are the sum of the boiler and the indirect 

 water 

heater.

 

Field supplied.  Full port valves are required.  Failure 

 

to use full port valves could result in a restricted flow 

 

rate through the boiler.

  Field supplied. Check valves are required for 
 

installation as shown in FIG.’s 5-2 and 5-3.  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 valves are required.  Failure to use 

 

full port 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 

(46°C).

 

Factory supplied.  The pressure relief valve is sized to 

 ASME 

specifications.

9.  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.  The sensor should be 
 

located far enough downstream to sense system diluted 

 water 

temperature. 

A system supply sensor (factory supplied) 
MUST BE installed with Primary/Secondary 
systems for proper boiler operation.

10. Y-Strainer:
 

Field supplied.  A Y-strainer 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.

 CAUTION

The maximum allowable water flow rate 
through a single Crest boiler is 350 GPM. 
Exceeding this flow rate will result in damage 
to the heat exchanger and/or piping.

Reference Table 5B1 for the minimum 
recommended flow rate through a single 
Crest boiler at full fire to maintain a 80°F 
temperature rise.  Reference Table 5B2 for 
the absolute minimum flow rate through a 
single Crest boiler.  

35

46

58

70

81

25

25

25

25

45