Leslie Controls NYC Heat Exchanger - Manual (Page 8)

Page 8 of 25
Schematic Component Descriptions
1. Power on Light:
•
Indicates that power is being supplied to
system.
•
Fuse F1 blown, burnt out light or
disconnection of power will cause light to go
out.
2. No flow light:
•
Will light red when pressure switch
(PS1) senses no pressure across pumps.
3. Reset Switch:
•
This switch is only used if unit was set up so
that it will not automatically reset. It is a
manual switch that will unlatch latched relay
and set all switches back to start position
after an over temperature condition was seen
by unit .
•
Note, this switch is not required if unit is
setup for automatic restart.
4. P1/P2 Switch:
•
Turns first pump on and second pump off or
vice versa.
•
Front panel light will identify active pump.
5. Primary and secondary over temperature
switches:
•
If either primary or secondary switch sees an
over temperature condition, then:
1.
Solenoid supplying hot water is de-
energized to the shut position.
2. Latching relay and over temperature
light are energized.
3. Power to re-circulation pump is cut off.
4. Latching relay supplies power to three
way condensate diverting valve and
Three way condensate diverting valve
diverts hot condensate water away from
cooler and sends it directly to condensate
return line.
•
Latching relay:
1.
Upon an over temperature condition,
latch will hold three way condensate
diverting valve in diverting position until
over temperature switch has reset and
over temperature condition no longer
exists. It will then allow diverting valve
to go back to sending condensate water
to cooler.
6. Auto/Manual Switches:
•
Perform same function as primary and
secondary temperature over temperature
switches.
Pump Connections
Figure 5 - Motor Conduit Box Wiring Detail
D. OPERATION OF NORMAL
RECIRCULATION PUMP
PERIODIC INSPECTION
It is recommended that periodic inspections be made to
check for potential problems with pump. If any leakage or
evidence of leakage is present, repair or replace unit.
Figure 6 - Pump Sectional Drawing
“P-1” pump is used under normal situations. Green light
for “P-1” is lit and red light for “NO-FLOW” is not lit. If
this pump should fail then Red light for “NO_FLOW” will
light. Follow instructions for isolating this pump and
starting secondary pump.
E. OPERATION OF SECOND
RECIRCULATION PUMP
This pump is used under maintenance situations. Light for
“P-2 is lit and red light for “NO-FLOW” is not lit. If this CAUTION!
Manufacture’s IOM must be referred to. This IOM is
FOR GENERAL USE ONLY .