Pentax TH6220D Installation Manual
Installation
Guide
TH6220D
Programmable Thermostat
Product Application
This thermostat provides electronic control of 24 VAC single-stage and multi-stage
heating and cooling systems, or 750 mV heating systems.
System Types
(up to 2 heat/2 cool)
• Gas, oil, or electric heat with air
conditioning
Power Options
• Battery power only
• Common wire only
• Common wire with battery backup
• Warm air, hot water, high-efficiency
furnaces, heat pumps, steam, gravity
• Heat only — two-wire systems,
power to open and close zone
valves (Series 20), and normally-
Changeover Options
• Selectable manual or
auto-changeover modes
open zone valves
• Heat only with fan
• Cool only
• 750 mV heating systems
System Settings
• Heat, Off, Cool,Auto, Em Heat
Fan Settings
• Auto, On
Must be installed by a trained, experienced technician
• Read these instructions carefully. Failure to follow these instructions can
damage the product or cause a hazardous condition.
• Check the ratings in this booklet to verify that this product is suitable for your
application (see page 17).
• Always test for proper operation after installation (see page 13).
CAUTION: ELECTRICAL HAZARD
Can cause electrical shock or equipment damage. Disconnect power before
beginning installation.
MERCURY NOTICE
If this product is replacing a control that contains mercury in a sealed tube, do not
place the old control in the trash. Contact your local waste management authority for
instructions regarding recycling and proper disposal.
® U.S. Registered Trademark. Patents pending.
Copyright © 2005 Honeywell International Inc. All rights reserved.
1
Install the thermostat about 5 feet (1.5m) above the floor in an area
with good air circulation at average temperature.
Do not install in locations where the thermostat can be affected by:
• Drafts or dead spots behind doors and in corners
• Hot or cold air from ducts
• Sunlight or radiant heat from appliances
• Concealed pipes or chimneys
• Unheated/uncooled areas such as an outside wall behind the thermostat
NO
NO
NO
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Pre-installation checklist ................2
Wallplate installation ......................3
Wiring..............................................4
Wiring diagrams ..............................5
Power options ..............................10
Thermostat mounting ..................10
SSeettuupp aanndd tteessttiinngg
Installer setup................................11
Installer system test ......................13
Explanation of features ................14
AAppppeennddiicceess
Quick reference to controls..........15
Quick reference to display............15
Battery replacement......................15
In case of difficulty ......................16
Accessories/replacement parts ....17
Specifications ................................17
Table of contents
Installation tips
Installation Guide
Pre-installation checklist
Package contents
Check to make sure your package includes the following items:
FocusPRO
programmable thermostat
(wallplate attached to back)
Wall anchors and
mounting screws
(2 each)
™
TH6220D
Quick
reference
card
AA alkaline
batteries (2)
Operating manual
Required tools & supplies
• No. 2 Phillips screwdriver
• Small pocket screwdriver
• Drill
• Drill bit (3/16” for drywall, 7/32” for plaster)
• Hammer
• Pencil
• Electrical tape
• Level (optional)
2
FocusPRO™TH6220D Programmable Thermostat
3
Remove the wallplate from the thermostat as shown at left, then follow
directions below for mounting.
1 Insert quick reference card in slot
in back of thermostat.
2 Pull wires through wire hole.
3 Position wallplate on wall, level and
mark hole positions with pencil.
4 Drill holes at marked positions as
shown below, then tap in supplied
wall anchors.
5 Place wallplate over anchors, insert
and tighten mounting screws.
Insert finger into wire hole and pull to
remove wallplate from thermostat.
Drill 3/16” holes for drywall.
Drill 7/32” holes for plaster.
Wall anchors
Mounting screwsWire hole
Wallplate installation
Insert quick reference card
Installation Guide
Wiring
CAUTION: ELECTRICAL HAZARD. Can cause electrical shock or equipment damage.
Disconnect power before wiring.
Keep wires in this
shaded area
Heat Pump
Conventional
NOTES
R & Rc terminals
In single-transformer system, leave metal
jumper in place between R & Rc. Remove
metal jumper if two-transformer system
C terminal
The C (common wire) terminal is optional
when thermostat is powered by batteries.
W (O/B) terminal
If thermostat is configured for a heat pump
in the Installer Setup, configure changeover
valve for cool (“O” factory setting) or heat
(“B”).
L terminal (Output)
Heat pump reset. L terminal powered continuously when thermostat is set to Em Heat.
Configure thermostat for 2 heat / 1 cool heat
pump in the Installer Setup.
Wire specifications
Use 18- to 22-gauge thermostat wire.
Shielded cable is not required.
.
Wiring
1 Loosen screw terminals, insert
wires into terminal block, then
re-tighten screws.
2 Push excess wire back into the
wall opening. Keep wires in shaded
area as shown at left.
3 Plug the wall opening with non-
flammable insulation to prevent
drafts from affecting thermostat
operation.
Terminal Designations
Conventional Terminal Letters:
Y2 2nd stage compressor contactor
W2 2nd stage heat relay
G Fan relay
W 1st stage heat relay
C Common wire from secondary side of
cooling system transformer
Y 1st stage compressor contactor
R Heating power. Connect to secondary
side of heating system transformer.
Rc Cooling power. Connect to secondary
side of cooling system transformer.
Heat Pump Terminal Letters:
L Heat pump reset. L terminal powered
continuously when System is set to Em
Heat.
E Emergency heat relay
Aux Auxiliary heat relay
G Fan relay
O/B Changeover valve for heat pumps
C Common wire from secondary side of
cooling system transformer.
Y Compressor contactor
R Heating power. Connect to secondary
side of heating system transformer.
Rc Cooling power. Connect to secondary
side of cooling system transformer.
4
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