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186CNV: Installation Instructions
Table 5 – ODT Resistance Values versus Temperatures
TEMPERATURE (°C)
25
75
125
If the outdoor air or coil thermistor should fail, the control will flash the
appropriate fault code (see
Table
IMPORTANT: The outdoor air thermistor and coil thermistor should be
factory mounted in the final locations. Check to ensure thermistors are
mounted properly (See
Fig.
27,
Outdoor Air Thermistor
The outdoor air thermistor is a 10Kohm resistor used for multiple system
operations. It provides the outdoor air temperature to the primary
control module and user interface. It is essential for controlling the
system and is used in almost all modes of operation. The sensor is
mounted in the control box per
Fig. 27 – Outdoor Air Thermistor Mounting Location
Outdoor Coil Thermistor
The outdoor coil thermistor is a 10Kohm resistor used for multiple
system operations. It provides the coil/liquid line temperature to the
primary control module and user interface. It is used for low ambient
operation and assistance with OAT temperature measurement. The
sensor must be securely mounted to the tube connecting the coil and
distributor. See
Fig. 28
for proper placement. See
resistances.
Fig. 28 – Outdoor Coil Thermistor Mounted on Coil
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
RESISTANCE (K OHMS)
50.15 + / - 5.0%
7.565 + / - 3.0%
1.7 + / - 1.4%
7.)
Fig. 28
and
Fig.
29).
Fig.
27.
Table 4
for proper
Discharge Thermistor (ODT)
Discharge thermistor is used for protection against over temperature of
the compressor and the discharge superheat calculations.
mounting is required to ensure that the unit exits the start-up mode. The
ODT is located on the compressor discharge stub-out (see
Fig. 29 – Discharge Thermistor (ODT) Mounting Locations
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage and/or
improper operation.
In order to minimize the ambient influence, make sure the thermistor
curved surface hugs the pipe surface and is secured tight using the wire
tie fished through the original slot, insulating polymer body.
Failed Thermistor Default Operation
Factory defaults have been provided in the event of failure of outdoor air
thermistor (OAT) and/or outdoor coil thermistor (OCT).
A200045
If the OAT sensor should fail the outdoor unit will operate at a fixed
speed.
If the OCT sensor should fail, the outdoor unit will operate at a fixed
speed.
Variable Speed Compressor Winding Resistance
This compressor operates with 3-phase variable frequency PWM
variable voltage. For troubleshooting certain fault codes
compressor resistances, follow these steps:
1. Disconnect compressor power leads from the inverter terminals,
U (YEL), V (RED), and W (BLK).
2. Measure the resistance between YEL to RED, YEL to BLK, and
RED to BLK and compare to
should be equal.
3. Measure the resistance to ground for each lead.
4. If the resistances are correct then reconnect power leads to
appropriate terminal.
5. If the resistances appear to be abnormal, it will be necessary to
measure the resistance at the compressor fusite terminals.
6. Remove the sound blanket and harness plug, measure the
resistances, and compare to
7. Reinstall compressor sound blanket making sure discharge
thermistor and compressor power harness are routed as they were
from the factory
Table 6 – Variable Speed Compressor Resistances
(winding resistance at 68°F? (20°F)
A200046
WINDING
Between terminals T1, T2, and T3
Between terminal & ground
16
CAUTION
!
Table 6
values. Each resistance set
Table
6.
24
36
.74
.453
>1 mega OHM
Proper
Fig.
29).
A200086
related to
48
60
.424
.424
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