Lochinvar 000 - 500 User Manual
1.
Maximum operating pressure for the pump must
exceed system operating pressure.
exceed system operating pressure.
2.
Maximum water temperature should not ex
ceed
nameplate rating.
3.
Cast iron circulators may be used for closed loop
systems.
systems.
4.
A properly sized expansion tank must be in stalled
near the boiler and located on the suction side of
the pump.
near the boiler and located on the suction side of
the pump.
Boilers are equipped with a relay for controlling the
circulation pump for the hot water loop. The relay turns
ON and OFF in response to the “W” input from the wall
thermostat or zone control.
circulation pump for the hot water loop. The relay turns
ON and OFF in response to the “W” input from the wall
thermostat or zone control.
The field installed boiler pump MUST NOT exceed
1 h.p. For continuous pump operation, wire the system
pump to the 120V supply. The pump should be
connected at the junction box as shown in Figure 41.
1 h.p. For continuous pump operation, wire the system
pump to the 120V supply. The pump should be
connected at the junction box as shown in Figure 41.
FIG. 41 Boiler Wiring - Circulation Pump to Junction Box
PUMP INSTALLATION AND MAIN TE NANCE: The
boiler circulating pump must be purchased lo cal ly. For
installation and maintenance information on the
circulator pump, refer to the pump man
boiler circulating pump must be purchased lo cal ly. For
installation and maintenance information on the
circulator pump, refer to the pump man
u
fac
tur
ers
in struc tion package included with the pump.
These units are equipped with an integral bypass pump,
which is designed to provide efficiency optimization by
maintaining a constant flow through the unit’s heat
exchanger loop when building system flow is reduced.
The bypass pump assembly is standard equipment and is
NOT to be used as a system pump.
which is designed to provide efficiency optimization by
maintaining a constant flow through the unit’s heat
exchanger loop when building system flow is reduced.
The bypass pump assembly is standard equipment and is
NOT to be used as a system pump.
FIG. 42 - Single Boiler Full System Flow
33
CIRCULATOR PUMP SPECIFICATIONS
CIRCULATOR PUMP OPERATION
(Heating Boilers Only)
TABLE - L
HEAT EXCHANGER PRESSURE DROP CHART
FOOT HEAD LOSS
BYPASS PUMP 45,000 - 260,000 Btu/hr
(Heating Boilers Only)
The bypass pump is dedicated to the unit and does not
affect the building’s system or primary/secondary
flow characteristics and will not circulate the
building.
affect the building’s system or primary/secondary
flow characteristics and will not circulate the
building.
NOTE:
EXPANSION TANK
MAKE-UP WATER
HEATING RETURN
LOOP
LOOP
HEATING SUPPLY LOOP
AIR SEPARATOR