Trane Voyager RT-SVX17C-EN, Installation Operation & Maintenance

Page: 65 / 80

65
System Troubleshooting (Continued)
Method 1
To reset the system from the space, turn the "Mode" selec-
tion switch at the zone sensor to the "Off" position. After ap-
proximately 30 seconds, turn the "Mode" selection switch to
the desired mode, i.e. Heat, Cool or Auto.
Method 2
To reset the system at the unit, cycle the unit power by turn-
ing the disconnect switch "Off" and then "On".
Lockouts can be cleared through the building management
system. Refer to the building management system instruc-
tions for more information.
Zone Temperature Sensor (ZSM) Service
Indicator
The ZSM SERVICE LED is used to indicate a clogged filter
or an air side fan failure.
Clogged Filter Switch
This LED will remain on 2 minutes after the Normally Open
switch is closed. The LED will be turned off immediately af-
ter resetting the switch (to the Normally Open position), or
any time that the IDM is turned off.
If the switch remains closed, and the IDM is turned on, the
SERVICE LED will be turned on again after the 2 (±1) min-
utes.
This LED being turned on will have no other affect on unit
operation. It is an indicator only.
Fan Failure Switch
The LED will flash 40 seconds after the fan is turned "On" if
the Fan Proving Switch is not made. This LED will remain
flashing until the unit is reset by means explained above. If
the "Fan Failure" switch opens for at least 40 seconds dur-
ing fan operation (indicating a fan failure) the unit will stop.
RTRM Zone Sensor Module (ZSM) Test
Note: These procedures are not for programmable
or digital models and are conducted with the Zone
Sensor Module electrically removed from the
system.
Zone Sensor Module (ZSM) Terminal Identification.
Terminal # Terminal I.D. Terminal # Terminal I.D.
J6-1 ZTEMP J6-6 LED COMMON
J6-2 SIGNAL COMMON J6-7 HEAT LED
J6-3 CSP* J6-8 COOL LED
J6-4 MODE J6-9 SYS ON LED
J6-5 HSP J6-10 SERVICE LED
Test 1
Zone Temperature Thermistor (ZTEMP)
This component is tested by measuring the resistance be-
tween terminals 1 and 2 on the Zone Temperature Sensor.
Below are some typical indoor temperatures, and corre-
sponding resistive values.
Zone or Set Point Nominal ZTEMP Nominal CSP or
Temperature Resistance HSP Resistance
50° F 19.9 K-Ohms 889 Ohms
55° F 17.47 K-Ohms 812 Ohms
60° F 15.3 K-Ohms 695 Ohms
65° F 13.49 K-Ohms 597 Ohms
70° F 11.9 K-Ohms 500 Ohms
75° F 10.50 K-Ohms 403 Ohms
80° F 9.3 K-Ohms 305 Ohms
85° F 8.25 K-Ohms 208 Ohms
90° F 7.3 K-Ohms 110 Ohms
Test 2
Cooling Set Point (CSP) and Heating Set Point (HSP)
The resistance of these potentiometers are measured be-
tween the following ZSM terminals. Refer to the chart above
for approximate resistances at the given set points.
CSP = Terminals 2 and 3
Range = 100 to 900 Ohms approximate
HSP = Terminals 2 and 5
Range = 100 to 900 Ohms approximate
Test 3
System Mode and Fan Selection
The combined resistance of the Mode selection switch and
the Fan selection switch can be measured between termi-
nals 2 and 4 on the ZSM. The possible switch combinations
are listed below with their corresponding resistance values.
VAV CV CV
System System Fan Nominal
Switch Switch Switch Resistance
OFF OFF AUTO 2.3 K-Ohms
COOL AUTO 4.9 K-Ohms
AUTO AUTO AUTO 7.7 K-Ohms
OFF ON 11.0 K-Ohms
COOL ON 13.0 K-Ohms
AUTO ON 16.0 K-Ohms
HEAT AUTO 19.0 K-Ohms
HEAT ON 28.0 K-Ohms
Test 4
LED indicator test, (SYS ON, HEAT, COOL & SERVICE).
Method 1
Testing the LED using a meter with diode test function. Test
both forward and reverse bias. Forward bias should mea-
sure a voltage drop of 1.5 to 2.5 volts, depending on your
meter. Reverse bias will show an Over Load, or open circuit
indication if LED is functional.
*CV Only