AERCO Electronic Controls System (ECS) - Manual (Page 43)

Electronic Control System (ECS) and Type CXT-E Valve
7. TROUBLESHOOTING
VD2: 02/28/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 Page 43 of 82
AC-105 OMM-0003_0D
Table 7-1. Troubleshooting – Control Valve CXT-E (Continued)
NO. FAULT INDICATION PROBABLE CAUSE CORRECTIVE ACTION
T3
(Continued)
System outlet water
temperature is below
desired setpoint
3. Steam pressure, or
heating fluid
temperature too low.
4. For Steam Heating
System, Trap or Orifice
in Heater Condensate
Line is malfunctioning.
3. Check the high side steam pressure
to the Control Valve to ensure it is
correct. For high temperature (HT)
water, ensure there is good
circulation.
a. If steam pressure or HT water
temperature is lower than the system
design spec., correct as necessary.
b. If high side steam pressure drops, or
there is no HT water circulation as
the Control Valve opens, there may
be a partially closed valve in the
upstream line. Also, the strainer may
be clogged. Correct as needed.
4. Check for improper operation of Trap or
clogged Orifice in Condensate Line as
follows:
a. If low side pressure gauge shows
pressure but steam does not heat
properly, CAREFULLY break
Condensate Line connection AHEAD
of Trap or Orifice.
b. Allow condensate to run out into floor
drain.
c. If Heater outlet temperature rises to
desired setpoint with condensate
connection open, repair or replace
Trap or unplug Orifice.
T4
Wide variations in
Heater outlet
temperature during
wide variations in flow.
ECS Flow Sensor not
functioning properly Refer to Table 7-2 and check operation of
Flow Sensor.
T5
Rapid fluctuations in
heater outlet
temperature which do
not follow load
changes 1. Temp. Controller not
functioning properly.
2. Steam System Trap or
Orifice fault
1. Refer to Table 7-2 and troubleshoot
Temperature Controller.
2. Refer to T3, Corrective Action 4 above
and proceed as indicated.