80 RT-SVD03G-EN
Zone Sensor Module Testing
Mode Input
Terminals to read voltage: RTRM J6-4, J6-2
Read DC voltage with Zone Sensor Module (ZSM) attached. If voltage read does not appear to be
correct, read the resistance of the circuit, then the ZSM itself, to see if a problem exists in the ZSM
or the wiring. With the ZSM not attached there should be 5.00 VDC at the terminals listed above.
To check for induced voltage, read AC voltage to ground from each sensor wire. Should be less than
2VAC.
Problems to look for:
• Miswire/short/open
• Excessive resistance in circuit (corroded or loose connection)
• Induced voltage (high voltage wires in same conduit)
Mode Input:
Mode Input RTRM J6-4 ZSM terminal 4
Common RTRM J6-2 ZSM terminal 2
Table 29.
System
Switch
Fan
switch
Ohms
Rx1K
Volts
DC +-
5%
Short to
common
00.00
OFF AUTO 2.32 0.94
COOL AUTO 4.87 1.64
AUTO AUTO 7.68 2.17
OFF ON 10.77 2.59
COOL ON 13.32 2.85
AUTO ON 16.13 3.08
HEAT AUTO 19.48 3.30
HEAT ON 27.93 3.68
EM HEAT AUTO 35.00 3.88
EM HEAT ON 43.45 4.06
Open circuit 5.00
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