Section 6. Led Indicators; Section 7. Troubleshooting - Trane Relay Panel Installation Manual

Section 6. LED Indicators

Comm
Communication LED – Amber
• LED on when first powering up
• LED flashes number of communicating com-
ponents in the system.
• (ex. communicating control with relay panel
will equal two flashes)
Bit Master
Bitmaster/Clock Signal LED – Green
• LED on when Clock is working
HVAC System
HVAC System LEDs – Green
• A Green LED will illuminate when the relay is
energized.

Section 7. Troubleshooting

Symptom
Loss of 24VAC between power (R) and common (B) Check for proper incoming 24VAC power
COMM LED is not
One or more communicating devices is not com-
flashing the ap-
municating
propriate number
• ~12VDC between D & B = Proper communication
of devices
• ~16VDC between D & B = Loss of communication
• Less than ~12VDC between D & B = shorted or no power
Loss of 24VAC between power (R) and common (B) Check for proper incoming 24VAC power
Bit Master LED is
Loss of communication
off or fluttering
• 0VDC between D & B (shorted or no power)
• Less than ~12VDC between D & B (low level short)
Control is not calling
HVAC System
LED is not illumi-
nating when Relay
Panel is calling for
Relay Panel failed
a particular relay
6200 Troup Highway
Tyler, TX 75707
© 2011 Trane
12
Troubleshooting
Possible Cause
The manufacturer has a policy of continuous product and product data improvement
and it reserves the right to change design and specifications without notice.
Representative-only illustrations included in this document.
NORM DUAL
Dual Fuel
Switch
D
0 SOV Data
Y1 Stg1
Thermostat
Y2 Stg2
and Indoor Unit
W1 Stg1
W2 Stg2
W3 Stg3
Fan
G
BK PWM
Hum
Hum
Aux1
Aux1
Aux2
Aux2
Relay Panel
Action
Check for open or shorts in field wiring
Evaluate other communicating devices and use
the service facts of that device if not communi-
cating properly
Check for shorted wire between data (D) and
common (B) wires
Check the System Report screen at the control
to verify demand
Verify 24VAC between relay output terminal and
common (B)
**Relay output contains snubber circuits; always
check with a load applied
R B
Hot
Com
RS
RS
ODT
ODT
Comm
Bit Master
18-HD68D1-3