Balance Points; Economic Balance Point - Mitsubishi Electric PAAA18AA1 Installation Manual

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
To Furnace
A A
01 02 03 04 05 06 07 08 09 10 11 12 01 02 03 04 05 06 07 08 09 10 11 12
To MA
Controller
B B

15.8. Balance points

The PAA unit automatically switches between heat pump heating and furnace heating based upon configu-
ration parameters and operational data.
The unit supports two outdoor temperature set points—Economic Balance Point and Capacity Balance
Point—that determine the most efficient method of heating.

15.8.1. Economic balance point

The Economic Balance Point is the outdoor temperature above which it is more efficient to heat with the
heat pump and below which it is more efficient to heat with the furnace.
The ideal Economic Balance Point (using a remote controller) will depend on the cost of the fossil fuel being
used for the furnace, the efficiency of the furnace, the cost of electricity, and the efficiency of the heat pump
for heating based upon various outdoor temperatures.
To configure the Economic Balance Point using MA controller, kumo cloud® app and MHK2 controllers,
please refer to the respective manuals.
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
FOR USING NAT
Op�onal
13 14 15 16 17 18 19 20 21 22 23 24 13 14 15 16 17 18 19 20 21 22 23 24
TB-A
TB-B
Circuit Boards
FRONT OF CONTROL BOX
Factory Connec�on Within Control Box. DO NOT ALTER. Factory Connec�on Within Control Box. DO NOT ALTER
91
To NAT To TH01
S1 S1 S2 S2 S3 S3
To
Outdoor
TB-C
Unit
B B
© 2022 Mitsubishi Electric US, Inc.
A A