Robertshaw 9720 User manual

User’s Manual
Quick Start Installation and Programming
110-662
W
A
R
R
A
N
T
Y
7 Day Programmable
3 Heat / 2 Cool
INTEGRATED COMFORT SOLUTIONS™
DELUXE
PROGRAMMABLE
THERMOSTAT
9720
®
HEAT PUMP
H
FIVEYEAR LIMITED WARRANTY
Maple Chase Company warrants to the original contractor installer or to the original consumer user, each new Robertshaw thermostat to be
free from defects in materials and workmanship under normal use and service for a period of five (5) years from the date of purchase.
This warranty does not cover batteries, damage caused by batteries, damage resulting from improper installation, alteration, misuse or abuse
of the thermostat occurring after the date of purchase.
Maple Chase Company agrees to repair or replace at its option any thermostat under warranty provided it is returned within the warranty
period, postage prepaid, with proof of the date of purchase. Cost of thermostat removal or reinstallation is not the responsibility of Maple
Chase Company.
Repair or replacement as provided under this warranty is the exclusive remedy of the consumer.This warranty and our liability does not apply
to batteries or the merchandise that has been damaged caused by misuse, neglect, mishandling, alterations, improper installation, or use in a
way other than in accordance with Maple Chase Company’s recommendations and instructions. Except to the extent prohibited by applicable
law, any implied warranty of merchantability or fitness for a particular purpose on this product is limited to the duration of this warranty.
Some states do not allow the exclusion or limitation of incidental or consequential damages, or allow limitations on how long an implied
warranty lasts, so the above limitations or exclusions may not apply to you.This warranty gives you specific legal rights, and you may also
have other rights which vary from state to state.
Instructions for return:
Pack the thermostat carefully in a well-padded carton. Be sure to include a note describing, in detail, what is wrong with the product. Return,
postage prepaid, to: Uni-Line North America, 515 S. Promenade Ave., Corona, CA 91718, Attn: Warranty Department.
Maple Chase Company
2820 Thatcher Road
Downers Grove, Illinois 60515
United States of America

PRODUCT FEATURES
2
MON
PROG/MAN
SET
QUICKSET
LOCK
FILTER
SYSTEM
FAN
INSTALL BYPASS
PM
MANUAL
HEAT
F
AUTO FAN
• Attractive, Styleline™ design
• 7-day programming; 4 setpoints per day
• 4 pre-programmed setpoints
• EnergyStar
®
compliant
• QuickSet™ programming mode
• Autochangeover mode automatically switches system
from heat to cool
• Programmable fan control
• Detachable sub-base allows you to remove mounted thermostat
for easy, convenient programming
• Energy Efficient Recovery (EER™) mode for maximum savings
• Filter monitor notifies when to change or clean furnace filter
• Programmable keypad lock prevents unauthorized
re-programming
• NiteView™ LCD display backlight
• Programmable residual cooling fan delay for increased air
conditioning efficiency
• Allows for up to 3 remote temperature sensors
• Visual and audible low battery signal
• High temperature protection
As an EnergyStar
®
partner, Maple Chase has determined that this product meets the EnergyStar
®
guidelines for energy efficiency.
39
Symptom Remedy
Fan runs continuously for hours at Review programmable fan settings entered during programming.
different times of the day (See "PROGRAMMING".)
Filter monitor indicates "CHECK FILTER" Check with your filter supplier and modify Filter Monitor settings to match
too soon for proper filter servicing interval. your servicing intervals. (See "PROGRAMMING FILTER MONITOR".)
If problems with thermostat cannot be solved, call:
Technical Service: [phone]
Monday-Friday 7:30 - 5:30 Central StandardTime
If calling after hours, a 24-hour
automated help line is available.

KEYPAD QUICK REFERENCE
3
SET
FILTER
PROG/MAN
QUICKSET
LOCK
SET - Begins, saves, and advances
programming inputs
PROG/MAN - Sets thermostat to either
program or manual mode. Provides quick
return to normal operating mode from
any menu
QUICKSET - Allows quick programming by
enabling user to program all seven days at
once
LOCK - Accesses keypad “lock” and
“unlock” feature
FILTER - Accesses filter monitor
and status
SYSTEM - Accesses 5 modes of
operation: HEAT, COOL,
AUTO(changeover), EMER
(emergency heat), or system OFF
FAN -Accesses two modes of fan
operation: auto and on
Decreases or
reverses setting
on display.
AUTO FAN
MAIN DISPLAY (OFF MODE)
A few seconds after power up or RESET, the display shown
above will appear.The thermostat will be in OFF mode.
1. Press SYSTEM button to enter HEAT, COOL, AUTO*
(changeover), or EMER (emergency heat) modes of
operation.
2. Press PROG/MAN button to enter program or manual
modes. Pressing PROG/MAN returns thermostat to
main display from any menu.
*AUTO may only be entered if "AUTO CHG" was enabled during installation
and you are in PROGRAM mode. (See "CHANGING DIP SWITCH SETTINGS.")
V
V
Increases or
advances setting
on display.
SYSTEM
FAN
Symptom Remedy
Room temperature reading is If you have attached remote sensors, the thermostat will display the
inaccurate. average temperature of the activated sensors. See "INSTALLATION
INSTRUCTIONS" and "CHANGING DIP SWITCH SETTINGS".
If there are no remote sensors attached, make sure that the remote sensor
dip switch settings on the rear of the thermostat body are turned off and
the MAIN thermostat dip switch is turned on. See "CHANGING DIP
SWITCH SETTINGS."
Thermostat turns on system before my Energy Efficient Recovery (EER™) is in effect.This optional feature turns
programmed setpoint time. on the system prior to the next setpoint time to reach the temperature you
have programmed. See "PROGRAMMING"and "ENERGY EFFICIENT RECOVERY (EER™)".
Thermostat will not let me change AUTO (changeover) mode may be active. See OPERATION - Selecting
setpoint temperature above or below Changeover). AUTO will be indicated in display.
a certain point.
"CHECK FILTER" is indicated in main display. See "PROGRAMMING - Programming Filter Monitor".
Thermostat does not automatically Verify that thermostat is in PROGRAM mode and AUTO is indicated
switch from HEAT to COOL mode of in the display for proper AUTO (changeover) operation.
operation.
Auto (changeover) may have been disabled during installation.
(See "SELECTING AUTO CHANGEOVER".)
38

The Robertshaw Item 9720 is directly compatible with 24V AC multi-stage heat pump systems with up to 3
stage heat/2 stage cool. It will operate with multi-stage heat pump systems that are automatic or manual
changeover and have auxiliary or emergency heating.There are no optional items required for standard
system installations.
This thermostat will automatically control the heat and/or air conditioning system. Once programmed, it will
automatically adjust the temperature setting and fan operation at your programmed times. When used
properly, this thermostat can reduce heating and cooling costs throughout the year.
TABLE OF CONTENTS
Product Features ..................................2
KeyPad Quick Reference ......................3
Important Safety Information ..............5
Helpful ProgrammingTips ..................6
NiteView™ LCD Display Backlight ......8
RemovingThermostat from Wiring
Subbase ................................................9
Programming ........................................11
Set or ChangeTime, Day, etc ..........11
Selecting ˚F/˚C ..................................13
Program Overview ..........................13
Programming with Quickset............15
Review, Change, or Personalize......17
Review or Modify Program ............20
Energy Efficient Recovery (EER™)..21
4
Programming Filter Monitor ................22
Checking Filter Monitor ....................22
Resetting Filter Monitor....................22
Programming Keypad Lock ..............23
Unlocking Keypad ............................24
Operation ..............................................25
Beginning Programmed
Operation...........................................25
ResettingThermostat ........................26
Compressor Protection ....................27
Selecting Auto Changeover ............28
24V AC Circuit Power Monitor..............30
LED Indicators........................................30
Changing Dip Switch Settings..............31
Replacing the Back-Up Batteries ..........32
Cleaning and Repair ............................34
Troubleshooting ..................................35
Warranty................................Back Cover
37
Symptom Remedy
Thermostat does not follow program. Check AM/PM indicators at time of day and programmed time changes.
(See “PROGRAMMING.”)
Thermostat may be OFF. Select HEAT or COOL mode by pressing
SYSTEM button.
Program may not have been done in HEAT or COOL modes.
(See "PROGRAMMING".)
Both HEAT and COOL programs utilize the same setpoint time and
programmable fan settings. Only setpoint temperatures can be different.
(See "PROGRAMMING".)
Check compatibility guide and system specifications.
Thermostat in MANUAL mode. (See “OPERATION.”)
Thermostat may not have been programmed in HEAT or COOL position.
Verify program. (See “PROGRAMMING –To Review or Change Program.”)
System runs too long. Temperature differential may be set too high. Decrease temperature
differential to lower setting, see "PROGRAMMING".
System will not enter AUTO Thermostat must be in PROGRAM mode to run AUTO system operation.
(Auto Changeover) mode. Press PROG/MAN button until PROGRAM is indicated in display. Then,
press SYSTEM button until AUTO is indicated in display.

IMPORTANT SAFETY INFORMATION
WARNING:
■Always turn off power at the main power source by unscrewing fuse or switching circuit breaker to the off position
before installing, removing, or cleaning this thermostat.
■Read all of the information in this manual before programming this thermostat.
■This is a 24V AC low-voltage thermostat. Do not install on voltages higher than 30V AC.
■If you experience a loss of power, this thermostat will indicate “-AC” in the time field of the LCD display.This
means that your system’s 24V AC circuit is not receiving power or is not functioning correctly.The back-up
batteries provided in this thermostat will maintain the programming during the loss of power. However, the
thermostat requires 24V AC power and a functioning system for proper control.
■All wiring must conform to local and national building and electrical codes and ordinances.
■Do not short (jumper) across terminals on the gas valve or at the system control to test installation.This will
damage the thermostat and void the warranty.
■This thermostat is equipped with automatic compressor protection to prevent potential damage due to short cycling or
extended power outages.The short cycle protection provides a 5-minute delay between heating or cooling cycles to
prevent compressor damage.
During extended power outages our thermostat provides an extra margin of compressor protection in the heat
mode by delaying the first stage of heating (heat pump) from engaging until the compressor crankcase oil has
been warmed.This will help avoid compressor damage due to improper oil circulation during cold weather
conditions.This important safeguard will delay the first stage of heating (heat pump) for 1 hour less than the
power outage, for up to 12 hours maximum. During this period the system will depend on the auxiliary stages of
heating to maintain the setpoint temperature.
!
5
Symptom Remedy
Thermostat will not turn on heat pump Compressor power outage safeguards may be in effect.
in heat mode. Uses auxiliary stages of (See "COMPRESSOR PROTECTION.")
heating to control setpoint.
Heat turns on instead of cool and Check wiring and system specifications.
vice versa.
Thermostat turns on and off too much. Increase temperature differential setting. (See “PROGRAMMING.”)
Display is indicating “LO BATT.” Replace back-up batteries soon. Be sure battery installation is correct.
(See “REPLACINGTHE BACK-UP BATTERIES.”)
Thermostat beeps once per minute Back-up batteries low. Change batteries immediately. (See "REPLACING
and "LO BATT" is indicated in display. THE BACK-UP BATTERIES".)
LCD display is blank. Replace batteries to control system. (See "REPLACINGTHE BACK-UP
BATTERIES".)
Thermostat does not change when SYSTEM button is in OFF or is in AUTO (changeover) position.
the ∨or ∧ buttons are pressed.
Thermostat beeps and does not allow Autochangeover "deadband" conflict (See "SELECTING AUTO
temperature changes when ∨or ∧ CHANGEOVER".) or thermostat is locked.
buttons are pressed.
36

IMPORTANT SAFETY INFORMATION (CONT.)
■Do not switch system to cool if the temperature is below 50°F (10°C).This can damage the
cooling system and may cause personal injury.
■This thermostat is 24V AC powered and requires connection to both sides of transformer for
proper operation. It also requires four charged “AA” ENERGIZER®brand batteries or
equivalent alkaline batteries as a back-up power source. Should the 24V AC circuit be
interrupted temporarily due to a power outage, the battery back-up will maintain all program
information during power outages.
■Replace back-up batteries every year or when “LO BATT” indicator appears on the thermostat
display.
■Use this thermostat only as described in this manual.
■Make sure the SYSTEM switch is in the HEAT or COOL position before programming.
The thermostat will not allow programming in AUTO or OFF modes. Do not program in
EMER mode.
■Make sure you set the time of day (note AM/PM indicator) and day of week accurately to
ensure correct operation.
■The program schedule has a winter (HEAT) and a summer (COOL) program. Both schedules will
use the same time and programmable fan settings, but can have different temperature settings.
If you change the time or programmable fan setting in one program, the opposite program will
change also.
6
HELPFUL PROGRAMMING TIPS
SYSTEM
TROUBLESHOOTING
Symptom Remedy
Thermostat does not turn on system. Check wiring. (See “Installation Instructions” included with thermostat.)
Check to see if "OFF" is indicated in display. Select HEAT or COOL mode
by pressing SYSTEM button.
Compressor short cycle protection or power outage safeguards may be in
effect. Press Install/Bypass behind front door to override.
(See "COMPRESSOR PROTECTION.")
Second stage of heat or cool turns on Increase second stage temperature differential setting.
too quickly. (See "PROGRAMMING.")
System turns on as much as two hours Energy Efficient Recovery (EER™) mode is active; thermostat is operating
before the setpoint time. normally. (See "PROGRAMMING- Energy Efficient Recovery.")
Display is indicating "-AC" in time field. This indicates the thermostat has detected that the 24V AC circuit to
which it is attached is not functioning. Check wiring, fuses, and power
source to determine the cause of the problem.The back-up batteries in
this thermostat will maintain the programming until system power can be
restored. (See "24V AC CIRCUIT POWER MONITOR.")
35

■The Energy Efficient Recovery (EER™) feature looks ahead up to 2 hours prior to the end of
the set-back (or set-up) period to begin monitoring system performance and calculating
when to turn on the system. It also determines whether the auxiliary heat or cool stages
should be activated prior to setpoint time to meet your chosen setpoint temperature.The
thermostat will indicate "EER" in the display when this program feature is active.The EER™
feature will lock out the auxiliary stages until 30 minutes prior to the upcoming setpoint time
to utilize the most energy efficient heat pump (first) stage.The auxiliary stages of heating and
cooling will be available during this lock-out period to maintain the setpoint temperature
should the heat pump not be able to keep up with the heating or cooling demand.
■To control the system, press the SYSTEM switch until HEAT, COOL, EMER, or AUTO appears
in the display. The thermostat will not properly control the system to your desired setpoint
temperature unless it is in one of these operating modes.
■The EMER (emergency) mode of heat can be manually selected to bypass heat pump oper-
ation and switch to auxiliary or emergency stages of heating to control setpoint temperature.
■To enter AUTO, you must first be in PROGRAM mode. Press PROG/MAN button until
PROGRAM appears in display.Then press SYSTEM button to enter AUTO.
■The QuickSet™ feature programs each individual day simultaneously with the identical
program. Each and every day can then be individually modified to suit specific
needs/desires.
7
QUICKSET
PROG/MAN SYSTEM
SYSTEM
HELPFUL PROGRAMMING TIPS (CONT.)
CLEANING AND REPAIR
DANGER: ELECTRIC SHOCK HAZARD.Turn off power at the main service panel before cleaning, servicing, or
removing thermostat.
Use a dry cloth to remove any dust from the thermostat cover. Do not use water or submerge the thermostat in
water to clean.This can damage the thermostat.
If the thermostat does not operate properly, do not try to repair the thermostat yourself. This will void your
warranty. Return thermostat, shipping prepaid, to:
Uni-Line North America
Warranty Department
515 S. Promenade Ave.
Corona, CA 91719
See warranty information at the end of this manual.
34
!

NITEVIEW™ LCD DISPLAY BACKLIGHT
This thermostat incorporates a revolutionary new display backlight to make nighttime
temperature or program adjustments quick and easy.The NiteView™ display backlight uses
modern lighting technology to provide an even-flowing light behind the display.There are two
ways to activate the backlight:
1. Every time you press a keypad button or the ∨or ∧buttons to make an adjustment, the
backlight will automatically turn on illuminating the display.The backlight will turn off after about
a minute of inactivity.
2. Press the NiteView™ display backlight button located on the top of the thermostat (over the LCD
display). The backlight will turn off after about 15 seconds of inactivity.
8
MON
PROG/MAN
SET
QUICKSET
LOCK
FILTER
SYSTEM
FAN
INSTALL BYPASS
PM
MANUAL
HEAT
F
AUTO FAN
NiteView™ light button
Replacing The Back-Up Batteries:
CAUTION: Installing batteries backwards can damage
thermostat.
NOTE: Replace batteries with four “AA” alkaline batteries only.
1. Press SYSTEM button until "OFF" appears in the time field on
the display.
2. Remove thermostat from wiring subbase. (See “REMOVING
THERMOSTAT FROM SUBBASE” for more information.)
3. Turn thermostat over. Locate battery compartment.
NOTE: Replace all four batteries at the same time. The thermostat
will “hold” all programmed information for about 30 seconds without
battery power. If 30 seconds elapse before batteries are replaced, the
program will be lost.
4. Replace all batteries with four new “AA” alkaline batteries. Be
sure the positive (+) ends of the batteries match the positive
terminals in the battery compartment.
5. Replace thermostat onto wiring subbase.
6. Press SYSTEM button until HEAT or COOL shows on the right
side of the display.
33
!
Ñ+Ñ +
Ñ+Ñ +
BATTERY
COMPARTMENT
AUTO FAN
SYSTEM
SYSTEM
OPERATION

Your new thermostat can be removed from its wiring
subbase for easy programming, resetting the
thermostat, or changing the batteries.The wiring
subbase will remain attached to the wall.
To remove thermostat from wiring subbase:
1. Press SYSTEM button until OFF is displayed in the
time field.
2. Gently lift the bottom of the thermostat up and out
as shown in Figure 1.
3. Pull thermostat up and away from wiring subbase.
To replace thermostat onto wiring subbase:
1. Align slots on top of thermostat with square pins
on subbase.
2. Latch the top of the thermostat into place. Pivot the
thermostat down and push in to lock the bottom of
the thermostat into place.
Figure 1
REMOVING THERMOSTAT FROM WIRING SUBBASE
SYSTEM
AUTO FAN
9
32
Changing dip switch settings:
1. Use a small screwdriver or pencil to move the switch to the desired setting.
2. Press RESET button. See Figure 5. Pressing RESET will erase any previously
entered programming information.
NOTE: When changing the settings on “Switch 1”, the RESET button does not have
to be pressed for the new configuration to register or operate.
IMPORTANT: New dip switch settings for “Switch 2” will not register or operate
options until the RESET button is pressed.
REPLACING THE BACK-UP BATTERIES
This thermostat is 24V AC powered and requires connection to both sides of
transformer for proper operation. It also requires four charged "AA" ENERGIZER®
brand batteries or equivalent alkaline batteries as a back-up power source should
the 24V AC circuit be interrupted temporarily due to a power outage.The battery
back-up will maintain all program information during power outages.
This thermostat has two levels of low battery indication. As the back-up batteries
weaken, the thermostat will go to the next stage of low battery indication.
Low Battery—Stage 1
“LO BATT” stays constant on the display. Replace batteries soon. Display and
thermostat functions normal.
Low Battery—Stage 2
“LO BATT” stays constant on the display and thermostat “beeps” about once a
minute. Replace batteries immediately. Display and thermostat functions normal.
RESET
- + - +
- + - +
T
CH 1
Figure 5
MON
MANUAL
HEAT
PM
LO
BATT
F
OPERATION

To replace thermostat onto wiring subbase (cont.):
3. Press SYSTEM button to put the thermostat into HEAT,
COOL, EMER, or AUTO mode.The thermostat will return to
normal operating mode.
You may reset the thermostat at any time. Reset is located on the
back side of thermostat in the lower, right corner. See diagram.
Pressing reset will erase ALL programmed information as well as
time clock and day of week.
10
RESET
SYSTEM
31
CHANGING DIP SWITCH SETTINGS
Thermostat functions are determined by settings on two sets of dip switches: "SWITCH 1" and "SWITCH 2".These
dip switches are pre-set at installation. However, some users may want to change some of the dip switch settings
on SWITCH 2 to enable or change certain thermostat options.
Figure 3 shows the location of the dip switches. Figure 4 shows a close-up of the dip switches. Dip switches marked
with an asterisk (*) should not be changed by the user.These are pre-set at time of installation by the installer and
must only be changed by a certified contractor familiar with heating and air conditioning systems. Change only the
dip switches necessary for options programming.
OFFLOCK ON
AUTO CHG OFF ON
DEAD BAND 5˚ 3˚
NOT USED
SWITCH 2
Figure 4
RESET
- + - +
- + - +
SWITCH 1
SWITCH 2
DIP SWITCHES
OFF
OFF
OFF
OFF
ON
ON
ON
ON
MAIN
REM 1
REM 2
REM 3
SWITCH 1

Figure 3
*
*
*
*
Default Settings Default Settings
OPERATION