RT-SVX34C-EN 129
Diagnostics
Terminal locations
System Status / Diagnostics checkout procedure (DC volt meter required)
The method described below to determine unit status or to see if diagnostics are present assumes
the Zone Sensor or NSB panel is not within sight or close by or is not being used. If a zone sensor
is within sight however, DC readings need not be taken - just look at the LED or display and go to
STEP 3.
1. Measure and record DC voltage from J6-6 (common) to each output: J6-7, J6-8, J6-9, and J6-10.
2. Using the data below, determine if each output is ON, OFF, or PULSING.
All voltages are approximate - this is a sensitive circuit, so the type of voltmeter used, sensor
connections etc. may all slightly affect the reading.
ON = 30VDC if no NSB or ZSM with LED's is connected, 25VDC if NSB panel (BAYSENS119*)
is connected, 2VDC if ZSM w/ LED's (BAYSENS110*, BAYSENS021*) is connected.
OFF = 0.75 VDC regardless of ZSM / NSB connection
PULSING (DIAGNOSTIC PRESENT) = A distinct pulsing from 0.75 VDC to 30 VDC will be seen
depending on the type of meter used. Some meters may only pulse between 20 and 30 volts DC.
3. Refer to the data in "What Outputs Mean" section to determine course of action.
What Outputs Mean:
HEAT J6-7
• On = system is actively heating
• Off = system is not actively heating
• Pulsing = a diagnostic is present
(see DIAGNOSTICS section).
COOL J6-8
• On = system is actively cooling
• Off = system is not actively cooling
• Pulsing = a diagnostic is present
(see DIAGNOSTICS section).
SYSTEM J6-9
• On = RTRM has power
• Off = RTRM does not have power or has failed
• Pulsing = unit is in the TEST mode
SERVICE J6-10 On = dirty air filter indication
Off = normal operation
Pulsing = a diagnostic is present
Figure 61. Terminal Locations
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