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RT-SVX46G-EN

Troubleshooting

ReliaTel™ Control

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 and system status
information stored in the RTRM will be lost when the main
power is turned “Off”.

To prevent injury or death from electrocution, it is the
responsibility of the technician to recognize this hazard
and use extreme care when performing service
procedures with the electrical power energized.
1. Verify LED on face of the phase monitor is green. If LED

is red, correct supply power fault.

2. Verify that the Liteport LED on the RTRM is burning

continuously. If the LED is lit, go to Step 3.

3. 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 4

. If 24 Vac is not present, check the unit main

power supply, check transformer (TNS1). Proceed to
Step 4 if necessary.

4. 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 5

. If no

failures are indicated, proceed to

Step 6

5. If a system failure is indicated, recheck

Step 2

and

Step

. If the LED is not lit in

Step 2

, and 24 Vac is present in

Step 3

, the RTRM has failed. Replace the RTRM.

6. If no failures are indicated, use one of the TEST mode

procedures described in the “Unit Startup” 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 7

7. 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

Step 8

and

Step 9

8. 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.

9. Refer to the individual component test procedures if

other microelectronic 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. BAYSENS110*, BAYSENS109*,
BAYSENS119*, BAYSENS023A all have the remote panel
indication feature. The LED descriptions are listed below.

Zone Sensor LED 1 (System)

“On” during normal operation.
“Off” if a system failure occurs or the LED fails.
“Flashing” indicates test mode.

Zone Sensor 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.

WARNING

Hazardous Service Procedures!

Failure to follow all precautions in this manual and on

the tags, stickers, and labels could result in death or

serious injury.



Technicians, in order to protect themselves from

potential electrical, mechanical, and chemical hazards,