System Status Checkout Procedure
"System Status" is checked by using
one of the following two methods:
Method 1
If the Zone Sensor Module (ZSM) is
equipped with a remote panel with
LED status indication, you can check
the unit within the space. If the ZSM
does not have LED's, use Method 2.
THS/P03 have the remote panel
indication feature. The LED
descriptions are listed below:
LED 1 (System)
"On" during
normal operation. "Off" if a system
failure occurs or the LED fails.
"Flashing" indicates test mode.
LED 2 (Heat)
"On" when the heat
cycle is operating. "Off" when the
heat cycle terminates or the LED
fails. "Flashing" indicates a heating
failure.
LED 3 (Cool)
"On" when the
cooling cycle is operating. "Off"
when the cooling cycle terminates
or the LED fails. "Flashing" indicates
a cooling failure.
LED 4 (Service)
"On" indicates a
clogged filter. "Off" during normal
operation. "Flashing" indicates an
supply fan failure.
Maintenance
RT-SVX19A-E4
60
Troubleshooting
The RTRM has the ability to provide
the service personnel with some
unit diagnostics and system status
information. Before turning the
main power disconnect switch "Off",
follow the steps below to check the
ReliaTel™
Refrigeration Module (RTRM). All
diagnostics & system status
information stored in the RTRM will
be lost when the main power is
turned "Off".
1. Verify that the Liteport LED on
the RTRM is burning
continuously. If the LED is lit, go
to Step 3.
2. If the LED is not lit, verify that
24 VAC is present between J1-1
and J1-2. If 24 VAC is present,
proceed to Step 3. If 24 VAC is
not present, check the unit main
power supply, check transformer
(TNS1). Proceed to Step 3 if
necessary.
3. Utilizing "Method 1" or
"Method 2" in the system status
diagnostic section, check the
following: System status,
Heating status, Cooling status. If
a System failure is indicated,
proceed to Step 4. If no failures
are indicated, proceed to Step 5.
4. If a System failure is indicated,
recheck Steps 1 and 2. If the LED
is not lit in Step 1, and 24 VAC is
present in Step 2, the RTRM has
failed. Replace the RTRM.
5. If no failures are indicated, use
one of the TEST mode
procedures described in the unit
"Start-Up" section to start the
unit. This procedure will allow
you to check all of the RTRM
outputs, and all of the external
controls (relays, contactors, etc.)
that the RTRM outputs energize,
for each respective mode.
Proceed to Step 6.
6. Step the system through all of
the available modes, and verify
operation of all outputs, controls,
and modes. If a problem in
operation is noted in any mode,
you may leave the system in that
mode for up to one hour while
troubleshooting. Refer to the
sequence of operations for each
mode, to assist in verifying
proper operation. Make the
necessary repairs and proceed to
Steps 7 and 8.
7. If no abnormal operating
conditions appear in the test
mode, exit the test mode by
turning the power "Off" at the
main power disconnect switch.
8. Refer to the individual
component test procedures if
other microelectronic
components are suspect.
