Honeywell TH5220D Non-Programmable Digital Thermostat Installation Guide

Honeywell TH5220D Manual: Questions and Answers

Can I use the Honeywell TH5220D in a heat pump system?

Yes. Verify that Installer Setup Function 2 (Changeover Valve) is properly configured for your heat pump system. Installation Guide, p. 18

What is the maximum heat temperature setting?

90°F (32°C). Installation Guide, p. 19

How does Comfort differ from Economy mode on the Honeywell TH5220D?

Comfort prioritizes comfort by activating auxiliary heat readily based on heat pump performance. Economy attempts to reach setpoint without auxiliary heat, waiting longer before allowing activation. Installation Guide, p. 16

Which terminals on the Honeywell TH5220D show it's in emergency heat mode?

The L terminal is powered continuously when the thermostat is set to Em Heat. Installation Guide, p. 10

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