Troubleshooting Procedures - Trane RTHC-SVN02C-EN Installation Manual

12

Troubleshooting Procedures

This section offers some basic troubleshooting for the modules and components
associated with the condenser water regulating valve option.
4U1 ASM Module Checkout
Warning
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it
may be necessary to work with live electrical components. Have a qualified
licensed electrician or other individual who has been properly trained in
handling live electrical components perform these tasks. Failure to follow all
electrical safety precautions when exposed to live electrical components could
result in death or serious injury.
During installation, testing, servicing and troubleshooting of this product, it may be
necessary to work with live electrical components. Have a qualified licensed
electrician or other individual who has been properly trained in handling live electrical
components perform these tasks. Failure to follow all electrical safety precautions
when exposed to live electrical components could result in death or serious injury.
1. To perform this checkout, leave all power applied and all pressure transducers
connected.
2. First, check the power supply to the 4U1 module. Measure the VAC across AC
and ACC on the 4U1 board. It should be 24 VAC.
3. Measure the voltage between "TX1" and "-S" on the 4U1 module. The voltage
should be 25 VDC.
4. Measure the voltage between "TX2"and "-S" on 4U1 module. The voltage
should be 25 VDC.
5. If the supply voltages are out of range, check and tighten all the connections
between the 4U1 module and the 1U2 module.
Figure 6 4U1 Output Signal
mA
VDC
5 20
1
0
6. If the voltages are still out of range, check the 1U2 module. Replace the 1U2
module if necessary.
7 . Once the supply voltage is within range, the 4U1 module can be checked.
4
0
0
35 70 PSID
RTHC-SVN02C-EN