13
5
Troubleshooting
(continued)
Hot Water Generator Installation and Operation Manual
S
SY
YM
MP
PT
TO
OM
M
P
PR
RO
OB
BA
AB
BL
LE
E C
CA
AU
US
SE
E
C
CO
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RR
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EC
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E A
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ON
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Outlet temperature
fluctuates widely.
• Inlet energy source pressure is too
low or boiler water temperature is too low.
• The condensate / water return piping
has not been installed properly,
allowing the condensate / water to
drain freely (by gravity); the
condensate / water drain line is
restricted; or the condensate / water
check valve is leaking or has failed.
• The primary / inlet temperature control
valve is not closing properly.
• Bypass valve not adjusted (boiler
water).
• The primary / inlet temperature control
valve is not opening properly.
• For steam systems check the primary
energy source pressure/temperature. If the
reading is low, adjust the inlet
pressure/temperature to meet the design
requirements. If there is a restriction in the
primary energy source line, the pressure
reading will drop excessively when the
generator calls for full energy on steam
systems, even though the pressure seems
to be normal during light demand. If the
primary pressure is correct, the system
should reach design pressure for energy
source in the tube bundle as the
temperature of the water in the tank
heater approaches shutoff.
• Reconfigure the condensate / water
return piping and check valve to allow
for proper drainage. Check to assure
that there is no restriction in the
condensate / water drain line. Replace
the check valve if it is leaking or has
failed. Also, check to assure that there
is no restriction in the condensate /
water drain line.
• Verify control valve bulb was installed in
the bulbwell.
• Adjust bypass valve approximately half
closed. Readjust as necessary.
• Verify control valve actuator is working
properly , if not replace.
Excess or insufficient
condensate (boiler water)
being returned from the
unit.
• The condensate / water return piping
has not been installed properly,
allowing the condensate / water to
drain freely (by gravity); the
condensate / water drain line is
restricted; or the condensate / water
check valve is leaking or has failed.
• Bypass loop valve not adjusted (boiler
water).
• Reconfigure the condensate / water
return piping and check valve to allow
for proper drainage. Check to assure
that there is no restriction in the
condensate / water drain line. Replace
the check valve if it is leaking or has
failed. Also, check to assure that there
is no restriction in the condensate /
water drain line.
• Adjust bypass valve approximately half
closed. Readjust as necesssary.
Steam being discharged
into the condensate
drain.
• The tube bundle is heavily scaled or
damaged.
• Call Lochinvar Corporation, or an
authorized sales agent for instructions
on repair or replacement.
