39RT-SVX31A-EN
Before turning the main power discon-
nect switch “Off”, follow the steps be-
low to check the ReliaTel Refrigeration
Module (RTRM). All diagnostics & sys-
tem status information stored in the
RTRM will be lost when the main
power is turned “Off”.
HAZARDOUS VOLTAGE!
HIGH VOLTAGE IS PRESENT AT THE
TERMINAL BLOCK OR UNIT
MOUNTED DISCONNECT SWITCH.
To prevent injury or death from electro-
cution, it is the responsibility of the
technician to recognize this hazard
and use extreme care when perform-
ing service procedures with the electri-
cal power energized.
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 presence 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 trans-
former (TNS1). Proceed to Step 3 if
necessary.
3. Utilizing “Method 1” or “Method 2” in
the “System Status Diagnostic” sec-
tion, check the following:
System status
Heating status
Cooling status
If a System failure is indicated, pro-
ceed to Step 4. If no failures are in-
dicated, proceed to Step 5.
4. If a System failure is indicated, re-
check 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 de-
scribed 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 con-
trols (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 opera-
tion 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. Re-
fer to the sequence of operations for
each mode, to assist in verifying
proper operation. Make the neces-
sary 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 microelec-
tronic components are suspect.
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.
BAYSENS010B, BAYSENS011B,
BAYSENS019A, BAYSENS020A,
BAYSENS021A & BAYSENS023A all
have the remote panel indication fea-
ture. 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.
Trouble Shooting
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 operat-
ing.
“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 evaporator fan
failure
Below is the complete listing of failure
indication causes.
System failure
Check the voltage between terminals 6
and 9 on J6, it should read approxi-
mately 32 VDC. If no voltage is present,
a System failure has occurred. Refer to
Step 4 in the previous section for the
recommended troubleshooting proce-
dure.
Heating Failure
Verify Heat Failure by Ignition Module
(IGN) LED indicator:
OFF: No Power or Failure
ON: Normal
Slow Flash: Normal, Heat Call
Fast Flash: Error Code:
1 Flash: Communication
Failure
2 Flashes: System Lockout
3 Flashes: Pressure Switch Fail
4 Flashes TC01 or TC02 Open
5 Flashes: Flame w/o Gas
Valve
6 Flashes: Flame Rollout Open
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