Pressure Drop Chart; Boiler Pump Operation; Typical Piping - Lochinvar 000 - 500 Installation And Service Manual

TABLE - L
HEAT EXCHANGER PRESSURE DROP CHART
FOOT HEAD LOSS
CIRCULATOR PUMP SPECIFICATIONS
1. Maximum operating pressure for the pump must
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.
4. A properly sized expansion tank must be in stalled
near the boiler and located on the suction side of
the pump.
CIRCULATOR PUMP OPERATION
(Heating Boilers Only)
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.
The field installed boiler pump MUST NOT exceed
1 h.p. For continuous pump operation, wire the system
pump to the 120V supply.
connected at the junction box as shown in Figure 41.
The pump should be
33
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 u fac tur ers
in struc tion package included with the pump.
BYPASS PUMP 45,000 - 260,000 Btu/hr
(Heating Boilers Only)
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.
NOTE:
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.
MAKE-UP WATER
AIR SEPARATOR
HEATING SUPPLY LOOP
FIG. 42 - Single Boiler Full System Flow
EXPANSION TANK
HEATING RETURN
LOOP