Owner’s Manual
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Manual de Uso
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CT87N/CT87K
The Round
®
® U.S. Registered Trademark. U.S. Patents 7,159,789;
7,159,790; 7,476,988 and other patents pending.
Copyright © 2019, Resideo Technologies, Inc.
All rights reserved.
The Round
®
1. CAUTION TURN OFF POWER to system at the furnace, or at the fuse/circuit
breaker panel before you begin.
2. Remove cover and thermostat, but leave wallplate with wires attached.
MERCURY NOTICE
If your old thermostat contains
mercury, contact your local waste
management authority for proper
disposal instructions.
Is there a sealed tube containing
mercury? If so, see mercury notice
below.
Leave wallplate in place.
Old thermostat
Cover
Check package contents:
• Thermostat
• Coverplate
• Wall anchors & screws (2 each)
• Wire labels
Before you begin, make sure
you have:
• No. 2 Phillips & small pocket
screwdrivers
• Hammer
• Level (optional)
• Pencil
• Drill and bit (3/16” for drywall, 7/32”
for plaster)
Getting started
Remove your old thermostat
CT87K (24 Vac heating systems) • CT87N (24 Vac heating and cooling systems)
This thermostat contains a Lithium battery which
may contain Perchlorate material.
Perchlorate Material—special handling may apply,
See www.dtsc.ca.gov/hazardouswaste/perchlorate
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