Trane Voyager Commercial Installation, Operation And Maintenance Manual page 132

D D i i a a g g n n o o s s t t i i c c s s
Smoke Detector Switch
The LED will flash anytime that the N.O. Smoke
Detector input is closed and will be reset anytime that
the input is returned to its N.O. state. During an Active
Smoke Detector trip the unit will be shut down.
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 during fan operation (indicating a
fan failure) the unit will stop.
Condensate Overflow Switch
When the condensate overflow switch is closed, a drain
pan overflow condition is indicated and it will shut unit
operations down.
RTRM Zone Sensor Module (ZSM) Tests
N N o o t t e e : : These procedures are not for programmable or
digital models and are conducted with the Zone
Sensor Module electrically removed from the
system.
Table 73. Zone Sensor Module (ZSM) terminal
identification (constant volume only)
Terminal I.
Terminal # D.
J6-1 ZTEMP
SIGNAL
J6-2
COMMON
J6-3 CSP*
J6-4 MODE
J6-5 HSP
Test 1: Zone Temperature Thermistor (ZTEMP)
This component is tested by measuring the resistance
between terminals 1 and 2 on the Zone Temperature
Sensor. The following are some typical indoor
temperatures, and corresponding resistive values.
Table 74. Resistance values
Zone or Set
Point
Nominal ZTEMP
Temperature
Resistance
50° F 19.9 K-Ohms
55° F 17.47 K-Ohms
60° F 15.3 K-Ohms
65° F 13.49 K-Ohms
70° F 11.9 K-Ohms
75° F 10.50 K-Ohms
80° F 9.3 K-Ohms
132
Terminal I.
Terminal # D.
J6-6 LED COMMON
J6-7 HEAT LED
J6-8 COOL LED
J6-9 SYS ON LED
J6-10 SERVICE LED
Nominal CSP or
HSP Resistance
889 Ohms
812 Ohms
695 Ohms
597 Ohms
500 Ohms
403 Ohms
305 Ohms
Table 74. Resistance values (continued)
Zone or Set
Point
Nominal ZTEMP
Temperature
Resistance
85° F 8.25 K-Ohms
90° F 7.3 K-Ohms
Test 2: Cooling Set Point (CSP) and Heating Set
Point (HSP)
The resistance of these potentiometers are measured
between 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
terminals 2 and 4 on the ZSM. The possible switch
combinations are listed below with their corresponding
resistance values.
Table 75. Nominal resistance
VAV
System CV System
Switch Switch
OFF
OFF
COOL
AUTO
OFF
COOL
AUTO
AUTO
HEAT
HEAT
Test 4: LED Indicator Tests (SYS ON, HEAT, COOL
& SERVICE)
• M M e e t t h h o o d d 1 1 : : Testing the LED using a meter with
diode test function. Test both forward and reverse
bias. Forward bias should measure 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.
• M M e e t t h h o o d d 2 2 : : Testing the LED with an analog
Ohmmeter. Connect Ohmmeter across LED in one
direction, then reverse the leads for the opposite
direction. The LED should have at least 100 times
more resistance in reverse direction, as compared
with the forward direction. If high resistance in both
Nominal CSP or
HSP Resistance
208 Ohms
110 Ohms
CV Fan Nominal
Switch Resistance
AUTO 2.3 K-Ohms
AUTO 4.9 K-Ohms
AUTO 7.7 K-Ohms
ON 11.0 K-Ohms
ON 13.0 K-Ohms
ON 16.0 K-Ohms
AUTO 19.0 K-Ohms
ON 28.0 K-Ohms
RT-SVX34R-EN