Troubleshooting
RT-SVX33E-EN
41
Note:
Measurements should be made from LED common
(ZSM terminal 6 to respective LED terminal). Refer
to the Zone Sensor Module (ZSM) Terminal
Identification table at the beginning of this section.
Programmable & Digital Zone
Sensor Test
Testing Serial Communication Voltage
1.
Verify 24 Vac is present between terminals J6-14 & J6-
11.
2. Disconnect wires from J6-11 and J6-12. Measure the
voltage between J6-11 and J6-12; it should be about 32
Vdc.
3. Reconnect wires to terminals J6-11 and J6-12. Measure
voltage again between J6-11 and J6-12, voltage should
flash high and low every 0.5 seconds. The voltage on
the low end will measure about 19 Vdc, while the
voltage on the high end will measure from
approximately 24 to 38 Vdc.
4. Verify all modes of operation, by running the unit
through all of the steps in the “Test Modes” section
discussed in “Unit Start-Up”.
5. After verifying proper unit operation, exit the test
mode. Turn the fan on continuously at the ZSM, by
pressing the button with the fan symbol. If the fan
comes on and runs continuously, the ZSM is good. If
you are not able to turn the fan on, the ZSM is
defective.
ReliaTel Refrigeration Module (RTRM)
Default Chart
If the RTCI loses input from the building management
system, the RTRM will control in the default mode after
approximately 15 minutes. If the RTRM loses the Heating
and Cooling setpoint input, the RTRM will control in the
default mode instantaneously. The temperature sensing
thermistor in the Zone Sensor Module is the only
component required for the “Default Mode” to operate.
Unit Operation without a Zone Sensor
This procedure is for temporary operation only. The
economizer and condenser fan cycling functions are
disabled.
1.
Open and Lock the unit disconnect switch.
2. Remove the Outside Air Sensor (OAS) from the
condenser section of unit.
3. Use two (2) wire nuts, to individually cap the wires.
4. Locate the RTRM (J6). Connect two (2) wires to
terminals J6-1 and 2.
5. Connect the sensor (OAS) using two wire nuts to the
two (2) field supplied wires that were connected to
terminals 1 and 2 on J6.
WARNING
Live Electrical Components!
During installation, testing, servicing and
troubleshooting of this product, it may be necessary to
work with live electrical components. Have a qualified
licensed electrician or other individual who has been
properly trained in handling live electrical components
perform these tasks. Failure to follow all electrical
safety precautions when exposed to live electrical
components could result in death or serious injury.
Table 12. System mode and fan selection chart
Resistance
Valves (Ohms)
Zone Sensor
Unit/Fan Mode
Local Unit
Mode
Local Fan
Mode
2.32K
Off/ Auto
Off
Auto
4.87K
Cool/Auto
Cool
Auto
7.68K
Auto/Auto
Auto
Auto
10.77K
Off/On
Off
On
13.32K
Cool/On
Cool
On
16.13K
Auto/On
Auto
On
19.48K
Heat/Auto
Heat
Auto
27.93K
Heat/On
Heat
On
35.0K
Emergency Heat/
Auto
Emergency
Heat
Auto
43.45K
Emergency Heat/
On
Emergency
Heat
On
Out of Range
(Short)
INVALID/Short
Invalid (CV),
Auto (VAV)
Invalid
Out of Range
(Open)
INVALID/Open
Invalid (CV), Off
(VAV)
Invalid
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
Table 12. System mode and fan selection chart
Resistance
Valves (Ohms)
Zone Sensor
Unit/Fan Mode
Local Unit
Mode
Local Fan
Mode