Mitsubishi Electric PAA-A18AA1 Manuel D'installation page 37

CAUTION
Do not install the TH1 thermistor and NAT thermostat on the discharge side of the gas
furnace. This may cause thermistor and/or thermostat failure.
Also, do not install the TH1 thermistor and the NAT near any bypass duct or too close to
the furnace. Doing so will cause damage to the TH1 thermistor and the NAT from heat
from the furnace.
NOTE
When installing the PAA unit into unconditioned spaces, note that air temperatures in the
ductwork (as measured by the return air thermistor) may vary from the space temperature.
Where this variance is large, it can affect the system's ability to cool the occupied space
down to the minimum cooling set point or heat up to the maximum heating set point.
The following measures can be applied to mitigate the effect of the temperature variance:
• Insulate the ductwork.
• Use a remote controller option with sensing capability.
• Place the return air thermistor as far away from the furnace as possible, avoiding bypass
ducts, but taking care to ensure that all return duct branches remain upstream of the
thermistor.
• Ensure that the provided mounting bracket is used to position the return air thermistor
well within the airstream.
• Adjust fan in thermal off settings to maintain airflow through the cabinet.
• Install PAC-USSEN00(1|2)FM-1 as the return air sensor, placed into the conditioned
space.
• Use kumo cloud
and humidity sensor.
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
®
in conjunction with the PAC-USWHS003TH-1 wireless temperature
37 © 2022 Mitsubishi Electric US, Inc.