Mitsubishi Electric PAA-A18AA1 Service Manual page 35

NOTE
• The Test and the Emergency modes cannot occur at the same time.
• To enable W2, W1 must be ON.
The non‑adjustable thermostat (NAT), a construction-style thermostat included in the accessories bag,
should be used as the emergency thermostat.
Install the NAT in the return air duct next to the TH1 thermistor and connect the NAT between R and W1
on the control box. To enable both W1 and W2 to come on when the emergency thermostat calls for heat,
connect the W1 and W2 together to one side of the NAT and R to its other side.
Non-adjustable (emergency) thermostat connection
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
35 © 2022 Mitsubishi Electric US, Inc.