Leslie Controls NYC Heat Exchanger Supplement User Manual
Page 8
Page 8 of 9
Trouble Shooting Quick Check
Condition
Possible Cause
Fix
No Steam/Low Steam
Adjust steam regulator.
Blocked tubes in heat exchanger
Flush Heat exchanger.
Drain valves from steam traps are shut
Open drain valves.
Condensate drain line is blocked or valves are turned off
Clear line and turn on valves.
Solenoid is tripped
Turn on Manual switches “H-1” and
H-2”
Blend valve element defective
Test blend valve element and replace if
necessary.
No Hot water
Over temperature condition was reached and Thermo Switches
are still engaged.
Find out why over temperature
happened and let Thermo Switches
reset.
Shut of the Gain adjusters
Cold water main from street is shut off.
Reset Gain Valves (39)
Steam pressure above 15 psi
Steam adjust steam pressure or fix
steam regulator.
Steam Traps broken and steam is being sent to the condensate
cooler
Fix Steam traps.
System
Tripped
Blend valve element defective.
Test blend valve element and replace if
necessary.
Water
temperature
fluctuates or is
colder than
required
Blockage in condensate line causing condensate to back up into
heat exchangers.
Gain adjusters not adjusted correctly
Check the temperature of heat
exchanger outside casing. If top is hot
and bottom is warm or cold, shut unit
off and check draining of condensate.
Water
temperature
can not be
maintained at
120 F
Solenoid valves were back pressured and solenoid plug is
blocking flow.
Shut down unit, disassemble and
inspect solenoid units.
Water was drained from system and tubing to differential
pressure switch was not bled of air .
Run pump and then loosen inlet
compression fitting and bleed line until
all air is out of line. Do same with
outlet compression fitting.
Pump 1 or
Pump 2 Light
is lit and No
flow light is
on. Can see
Pump is
turning and
water is re-
circulating.
New differential pressure switch installed and not adjusted.
Run pump and then loosen inlet
compression fitting and bleed line until
all air is out of line. Do same with
outlet compression fitting. If light is
still on then adjust pressure switch
according to manufactures instructions.