Universal Electronics 975 User Manual

UniversalUniversal

Universal

UniversalUniversal

Digital 7 Day
Programmable

Comfort-Set

90 Series90 Series

90 Series

90 Series90 Series

PREMIUM

Model 975Model 975

Model 975

Model 975Model 975

Installation and OperatingInstallation and Operating

Installation and Operating

Installation and OperatingInstallation and Operating
InstructionsInstructions

Instructions

InstructionsInstructions

Retain for Future Use

®

TM

Easy, Menu-Driven Set-UpEasy, Menu-Driven Set-Up

Easy, Menu-Driven Set-Up

Easy, Menu-Driven Set-UpEasy, Menu-Driven Set-Up
and Programmingand Programming

and Programming

and Programmingand Programming

1

5

2

4

3

6

7 8

9

10
11

12

Premium options
to customize the thermostat
to fit your application.

17

16

15

14

13

INTRODUCTION

Thank you for purchasing
your new Model 975 thermo­stat. White-Rodgers has been
producing energy saving
controls for over 60 years.
We have been designing and
producing the Comfort-Set
family of electronic program­mable thermostats since

1982. Model 975 is the third
generation of the electronic
programmable family. We
believe you will find that
Model 975 is the most user

friendly and technologically

Introduction

Orientation

advanced thermostat available
today.

You will find information
about thermostat buttons and
display in the component
section beginning on page 2.

Installation instructions begin
on page 4.

Instructions for optional
thermostat configuration
begin on page 23. Program­ming information begins on
page 26. Descriptions of the
thermostat’s features begin on
page 32.

We have also added thumb
tabs to help you find sections
of the manual.

1

Installation Programming

Configuration

Features

Index

ORIENTATION

THE THERMOSTAT BUTTONSTHE THERMOSTAT BUTTONS

THE THERMOSTAT BUTTONS

THE THERMOSTAT BUTTONSTHE THERMOSTAT BUTTONS

See inside front cover for illustration
showing button locations.

1

(Blue arrow) Lowers temperature

setting (45°F or 7°C minimum)

2

(Red arrow) Raises temperature

setting (99°F or 37°C maximum)

3

The yellow indicator glows when

the system is operating.

4

This button (on top of the cover)

lights the display.

5

Used to initiate or review thermostat

programming.

6

Used with TIME

BACK

to set the clock.

FWD

/TIME

7

Used to adjust the time backward, or

to select the previous menu item.

8

Used to adjust the time forward, or

to select the next menu item.

9

Used with TIME

BACK

to set the current day.

10

Used to advance operation to the

FWD

/TIME

next program period.

11

Used to manually override
programming to hold at a selected
temperature.

12

Used to enter and configure the
VACATION mode.

13

Selects fan operation (see The
Display 21 ). This button is also used to
program the fan to run continuously
during a program period.

2

14

Used to set the filter change-out

time, or to set the filter change timer.

15

Sets the system mode (HEATing,

OFF, COOLing, or AUTOmatic

changeover).

16

Used to adjust the clock one hour

forward or back.

17

Used to start or return to program

operation.

THE DISPLAYTHE DISPLAY

THE DISPLAY

THE DISPLAYTHE DISPLAY

18

Displays system mode (

COOLCOOL

AA

UTUT

OO

A

AA

UT

UTUT

HOLDHOLD

O,

HOLD, or

OO

HOLDHOLD

COOL,

COOLCOOL

HEAHEA

HEA

HEAHEA

VV

AA

V

A

VV

AA

TT

T,

TT

CACA

CA).

CACA

OFFOFF

OFF,

OFFOFF

During programming displays the time

MOR, DAY, EVE, NHTMOR, DAY, EVE, NHT

period (

MOR, DAY, EVE, NHT) being

MOR, DAY, EVE, NHTMOR, DAY, EVE, NHT

programmed.. In the configuration
menu, the menu item name is shown,

PRPR

GMGM

one word at a time (

EMREMR

COOLCOOL

FF

EMR,

EMREMR

ANAN

COOL

F

AN

COOLCOOL

FF

ANAN

18 18

19

CHECK BATTERY STAT SYSTEM

MON

PR

PRPR

DELADELA

DELA

DELADELA

2324

GM

GMGM

°F

AM

MODEMODE

MODE,

MODEMODE

OFFOFF

OFF, etc.).

OFFOFF

21

20

FAN AUTOHRS

22

Figure 1. The Display

Orientation

19

CHECK BATTERYCHECK BATTERY

CHECK BATTERY appears when

CHECK BATTERYCHECK BATTERY

the “AA” alkaline batteries are weak and
should be replaced.

BATTERYBATTERY

BATTERY appears

BATTERYBATTERY

when the thermostat is running on
battery power only.

CHECK STCHECK ST

CHECK ST

CHECK STCHECK ST

AA

TT

A

T

AA

TT

appears when the thermostat detects
certain problems within itself.

SYSTEM SYSTEM

SYSTEM appears when the thermostat

SYSTEM SYSTEM

CHECKCHECK

CHECK

CHECKCHECK

detects certain problems in the heating
system.

21

CHECK BATTERY

MON WED THU FRI SAT SUNTUEWED THU FRI SAT SUNTUE

PRG

HRS

FAN ON

HEATHEAT

°F

AM

25

3

20

Indicates the length of time
remaining in a temporary hold
condition. Also indicates the length of
time remaining in VACATION mode.

21

Displays
operating continuously. Displays

AA

UTUT

A

UT

AA

UTUT

FF

AN ONAN ON

F

AN ON when the fan is

FF

AN ONAN ON

OO

O when the fan cycles with the

OO

FF

ANAN

F

AN

FF

ANAN

heating or cooling system.

22

Displays the setpoint temperature.

23

Alternately displays room
temperature and time of day.

24

Shows the current day of the week.
When programming, shows the day(s)
being programmed.

25

The word

HEAHEA

HEA

HEAHEA

TT

T or

TT

COOLCOOL

COOL will

COOLCOOL

appear above or below the setpoint if
area 18 is needed to display other
information.

INSTALLATION

DESCRIPTIONDESCRIPTION

DESCRIPTION

DESCRIPTIONDESCRIPTION

This White-Rodgers Automatic
Setback Digital Thermostat uses
microcomputer technology to
provide precise time and
temperature control. This

SPECIFICATIONSSPECIFICATIONS

SPECIFICATIONS

SPECIFICATIONSSPECIFICATIONS

Model 975:

7 Day programming

ELECTRICAL DATAELECTRICAL DATA

ELECTRICAL DATA

ELECTRICAL DATAELECTRICAL DATA

Electrical Rating:

17 to 30 VAC, 50/60 Hz

0.05 to 1.5 Amps

1.5 Amps maximum total load (all
terminals combined)

thermostat offers the flexibility
to design heating and cooling
programs that fit personal needs.
This thermostat is adaptable to
most 24 Volt residential forced

Standard Systems:

Fuel: gas, oil, electric.
Type:Heating/Cooling, Heat

Only, Hot Water or Steam
Systems, Single Stage
Compressor Heat Pump

THERMAL DATATHERMAL DATA

THERMAL DATA

THERMAL DATATHERMAL DATA

Setpoint Temperature Range:

45° to 99°F (7° to 37°C)

4

air, hydronic (hot water or
steam), millivolt, electric heat,
zone and single-stage heat pump
systems.

Operating Ambient Temperature:

32° to 110°F (0° to 43°C)

Operating Humidity Range:

90% non-condensing max.

Shipping T emperatur e Range:

-4° to 131°F (-20° to 55°C)

PRECAUTIONSPRECAUTIONS

PRECAUTIONS

PRECAUTIONSPRECAUTIONS

WARNINGWARNING

!

WARNING

WARNINGWARNING

▲

Do not short out terminals
on gas valve or primary
control to test. Short or
incorrect wiring will damage
thermostat and could cause
personal injury and/or
property damage.

Do not use on circuits
exceeding specified voltage.
Higher voltage will damage
thermostat and could cause
shock or fire hazard.

Thermostat installation
and all components of the
system shall conform to
Class II circuits per the NEC
code.

CAUTIONCAUTION

!

CAUTION

CAUTIONCAUTION

▲

To prevent electrical shock
and/or equipment damage,
disconnect electric power to
system at main fuse or
circuit breaker box until
installation is complete.

NOTENOTE

NOTE

NOTENOTE

Read all instructions
thoroughly before beginning
installation.

This thermostat is intended for use
with a low voltage system. Do not
use directly on a line voltage system
unless an isolation relay/transformer
is installed.

5

Installation

Do not exceed ratings shown in the
Specifications section, preceding
page. If in doubt about the electrical
ratings of your heating/cooling
system, have it inspected by a
qualified heating and air condition­ing contractor or licensed electri­cian.

All wiring must conform to local
and national electrical codes and
ordinances.

This control is a precision instru­ment, and should be handled
carefully. Rough handling or
distorting components could cause
the control to malfunction.

INSTALLATIONINSTALLATION

INSTALLATION

INSTALLATIONINSTALLATION
ATTENTION!ATTENTION!

ATTENTION!

ATTENTION!ATTENTION!

This product does not contain
mercury. However, this product
may replace a unit which contains
mercury.

Do not open mercury cells. If a
cell becomes damaged, do not touch
any spilled mercury. Wearing non­absorbent gloves, take up the spilled
mercury with sand or other
absorbent material and place into a
container which can be sealed. If a
cell becomes damaged, the unit
should be discarded.

Mercury must not be discarded in
household trash. When the unit this
product is replacing is to be
discarded, place in a suitable
container and return to White­Rodgers at 2895 Harrison Street,
Batesville, AR 72501 for proper
disposal.

REMOVEREMOVE

REMOVE

REMOVEREMOVE
OLD THERMOSTATOLD THERMOSTAT

OLD THERMOSTAT

OLD THERMOSTATOLD THERMOSTAT

Shut off electricity at main fuse or
circuit breaker box until installation
is complete AND the jumper leads
on the back of the new thermostat
are configured properly.

Remove the front cover of the old
thermostat. With wires still attached,
remove wall plate from the wall.

Identify each wire attached to the
thermostat using one of the labels

enclosed with the new thermostat.
Disconnect the wires from the old

thermostat one at a time. DO NOT
let the wires fall back into the wall.

Install the new thermostat using the
following procedures.

6

ATTACH BASE TO WALLATTACH BASE TO WALL

ATTACH BASE TO WALL

ATTACH BASE TO WALLATTACH BASE TO WALL

Remove packing material from the
thermostat. Place fingers of one
hand on the center top and bottom
portion of the thermostat. Grasp the
base in the other hand on top and
bottom center and gently pull
straight out. Forcing or prying on
the thermostat will cause damage to
the unit.

Place the base over the hole in the
wall where the wires come out and
mark mounting hole locations using
the base as a template. Drill
pilot holes, and install screw
anchors in the wall.

Run wires through hole in base and
attach base to wall (see fig. 1).

3

/16”

Insert the wires into the terminals on
the base using the appropriate
wiring diagram and tighten the
terminal screws.

CONFIGURINGCONFIGURING

CONFIGURING

CONFIGURINGCONFIGURING
AND PROGRAMMINGAND PROGRAMMING

AND PROGRAMMING

AND PROGRAMMINGAND PROGRAMMING

Before the power is turned on, the
thermostat must be configured to
operate properly with the system.
See the CONFIGURATION section
of this manual.

This thermostat can be programmed
for automatic temperature control.
Refer to Operating Instructions for
programming.

2

1

Figure 1. Thermostat base and terminalsFigure 1. Thermostat base and terminals

Mounting screws

1

Pull wires through this opening

2

Insert wires into terminal holes, then tighten screws

3

Screw anchors

4

Figure 1. Thermostat base and terminals

Figure 1. Thermostat base and terminalsFigure 1. Thermostat base and terminals

7

Installation

S1 S2 S3

MVWRHRCGYOB6

4

3

1

WIRING DIAGRAMSWIRING DIAGRAMS

WIRING DIAGRAMS

WIRING DIAGRAMSWIRING DIAGRAMS

All wiring diagrams are for typical systems only. Refer to equipment manufacturers’ instructions for specific system
wiring information.

3

2

1

H

MV 6 Y G W

E

From heating system

1

From 24 VAC transformer

2

Red jumper wire (provided)

3

See page 10 for letter identification.

Figure 2. Typical wiring diagram for heating only, two-wire, single transformer systemFigure 2. Typical wiring diagram for heating only, two-wire, single transformer system

Figure 2. Typical wiring diagram for heating only, two-wire, single transformer system

Figure 2. Typical wiring diagram for heating only, two-wire, single transformer systemFigure 2. Typical wiring diagram for heating only, two-wire, single transformer system

O B

RC RH

W

MVWRHRCGYOB6

L

KJ

I

M

NOTE: Ensure that RED RH/RC jumper wire (provided with thermostat) is

connected between thermostat’s RH and RC terminals for proper
operation with this system.

8

RH

MV 6 Y G W

O B

H

RC RH

3

2

1

RH

W

4

5

Y

G

C

D E

I

From heating system

1

From 24 VAC transformer

2

Red jumper wire (provided)

3

Red jumper wire (provided)

4

Red jumper wire (provided)

5

See page 10 for letter identification.

Figure 3. Typical wiring diagram for heat only, cool only, & heat/cool single transformer systemFigure 3. Typical wiring diagram for heat only, cool only, & heat/cool single transformer system

Figure 3. Typical wiring diagram for heat only, cool only, & heat/cool single transformer system

Figure 3. Typical wiring diagram for heat only, cool only, & heat/cool single transformer systemFigure 3. Typical wiring diagram for heat only, cool only, & heat/cool single transformer system

NOTE: Ensure that RED RH/RC jumper wire (provided with thermostat) is

connected between thermostat’s RH and RC terminals for proper
operation with this system.

NOTE: For three-wire heat only system, connect terminals

For cool only system, connect terminals

9

MVWRHRCGYOB6

L

KJ

M

GG

G,

GG

G, and

GG

GG

RHRH

RH.

RHRH

YY

Y,

YY

WW

W, and

WW

RHRH

RH.

RHRH

Installation

WIRING DIAGRAMSWIRING DIAGRAMS

WIRING DIAGRAMS

WIRING DIAGRAMSWIRING DIAGRAMS

1

MV 6 Y G W

A

From millivolt system

1

Millivolt System

A

Zone Valve

B

Cooling System

C

Fan Relay

D

Heating System

E

Changeover Relay Energized in

F

Cooling (Single Stage Heat
Pump System)

O B

NOTE: Thermostat must have batteries installed.

Figure 4. Typical wiring diagram for millivolt systemFigure 4. Typical wiring diagram for millivolt system

Figure 4. Typical wiring diagram for millivolt system

Figure 4. Typical wiring diagram for millivolt systemFigure 4. Typical wiring diagram for millivolt system

Changeover Relay Energized in

G

Heating (Single Stage Heat
Pump System)

Jumper Wire

H

TRANSFORMER

I

24 VAC Side

J

120 VAC Side

K

10

RC RH

MV

MVWRHRCGYOB6

Hot Side

L

Neutral Side

M

HEATING TRANSFORMER

N

COOLING TRANSFORMER

O

Jumper Wire (field-installed)

P

RH

MV 6 Y G W

O B

RC RH

1

1

2

RH

M

V

RC

3

4

Y

G

A

C D

L

KJ

I

MVWRHRCGYOB6

M

From heating system

1

From 24 VAC transformer

2

From fan relay

3

From cooling system

4

See page 10 for letter identification.

Figure 5. Typical wiring diagram for two-wire millivolt heating & three-wire cooling systemFigure 5. Typical wiring diagram for two-wire millivolt heating & three-wire cooling system

Figure 5. Typical wiring diagram for two-wire millivolt heating & three-wire cooling system

Figure 5. Typical wiring diagram for two-wire millivolt heating & three-wire cooling systemFigure 5. Typical wiring diagram for two-wire millivolt heating & three-wire cooling system

NOTE: Thermostat must have batteries installed.

11

Installation

WIRING DIAGRAMSWIRING DIAGRAMS

WIRING DIAGRAMS

WIRING DIAGRAMSWIRING DIAGRAMS

MV 6 Y G W

64

B

From zone valve

1

From 24 VAC transformer

2

(through zone valve)

Red jumper wire (provided)

3

See page 10 for letter identification.

5

21

Figure 6. Typical wiring diagram for heat only, three-wire, zone valve systemFigure 6. Typical wiring diagram for heat only, three-wire, zone valve system

Figure 6. Typical wiring diagram for heat only, three-wire, zone valve system

Figure 6. Typical wiring diagram for heat only, three-wire, zone valve systemFigure 6. Typical wiring diagram for heat only, three-wire, zone valve system

3

2

1

1

H

O B

RC RH

R

W

H

MV W RH RC G Y O B 6

L

KJ

I

M

NOTE: Thermostat must have batteries installed.
NOTE: Ensure that RED RH/RC jumper wire (provided with thermostat) is

connected between thermostat’s RH and RC terminals for proper
operation with this system.

12

6