Carrier P374-1500 User manual

OWNER'S MANUAL
P/N P374-1500
Configurable for
Advanced Heat Pump or
Dual Fuel Operation
Programmable Thermostat
Can be configured for Dual Fuel operation (Heat Pump & Furnace).
7 Day Programmable
4 Time periods
Thermoglow Backlight
Advanced Heat Pump
Dual Fuel Configurable
Using Outdoor Sensor
Adjustable Times and
Deadbands Between
Stages
Adjustable Changeover
Balance Point
Replacement Component Division Carrier Corporation 6/99
HEAT
PUMP
DUAL
FUEL
3 HEAT - 2 COOL
*
*
TOTALINE
67
70
HEAT
COOL
AUTO
o
o
Am
6:03
68
Su

Table Of Contents
FRONT PANEL
DISPLAY
QUICK START Set the clock and go
BASIC OPERATION
PROGRAMMING 4 Time Periods
ADVANCED SETUP
ABOUT ADVANCED OPERATION
WARRANTY
Page 1
CAUTION
Follow Installation Instructions before proceeding.
SET THERMOSTAT TO MODE “OFF” PRIOR TO
CHANGING SETTINGS IN SETUP OR RESTORING
FACTORY DEFAULTS.
2
3
5
6
8
12
17
24
P/N P374-1500
Replacement Components Division Carrier Corporation 6/99

67
70
HEAT
COOL
AUTO
o
o
Am
6:03
68
Su
Front Panel
Page 2
Backlit LCD Display
Warmer or + Button
Cooler or - Button
Mode Button
Heat or Cool Indicator
Red = Heat, Green = Cool
67
70
HEAT
COOL
AUTO
o
o
Am
6:03
68
S
SET CLOCK
PROGRAMVACATIONOUTSIDEFAN MODE
Programmable
Thermostat
FAN PROGRAMVACATION SET CLOCKOUTSIDE

1
2
4
3
Mode Indicators
Selects the operation mode of the equipment.
HEAT - indicates the heat mode.
COOL - indicates the air conditioning mode.
AUTO - indicates the system will automatically
changeover between heat and cool modes
as the temperature varies.
OFF - indicates the entire system is turned off.
PROGRAM ON - indicates the stored program
is enabled to run. Page 8.
Clock with Day of the Week
Indicates the current time and day. This clock is
also used to program the timer periods. Page 5.
Room Temperature Display
Indicates the current room temperature.
Desired Set Temperature
Indicates desired room temperature(s). Page 7.
Display
Page 3
1
1
1
1
2
3
4
4
7
6
8
10
11
12
9
88
88
HEAT
COOL
OFF
AUTO
Fan On
Program
ServiceFilter
Locked
unoccupied
Setup
On
Start
o
o
Am
Pm
12:0 0
88
SMTWTFS
:
5
Outside
Day
Night
Evening
Morning

5
6
7
8
9
10
11
12
Outside Indication
Indicates the temperature displayed is from
the optional outside sensor. Page 21.
Morning, Day, Evening & Night Indication
Indicates the program time period. Page 8-11.
Setup Indication
Indicates the thermostat is in the programming
mode. Page 12.
Fan Operation Indication
Fan On - indicates constant, continuous fan
operation.
When Fan On is not lit - indicates the fan will
only operate when necessary to heat or
to cool. Page 7.
Service Filter Indication
Service Filter indicates when the filter should
be serviced under normal conditions.
Appears after 0 - 1950 hours of blower
operation (adjustable). Page 15.
Locked Indication
Locked appears after the right combination of
buttons are pressed, rendering the buttons
inoperative. Page 22.
Start Indication
Start appears when programming
timer functions. Page 8.
Unoccupied indication
Unoccupied appears when in the
Vacation mode. Page 23.
Display
Page 4

During Setup & Programming:
.
(Represented in dark black)
Pressing the Up and Down
buttons will modify the flashing
selection.
Press the SET CLOCK
button.
Press the SET CLOCK
button as above to
return to normal
operation.
Quick Start Set the Clock and Go
Page 5
This thermostat is preprogrammed from the
factory to operate 1, 2 or 3 Stage equipment without
the need for further programming. To optimize the
installation of this thermostat follow the instructions
in the Advanced Setup section.
2
Setup
S
buttons.
To adjust the
clock or Day use
Press
Setup
Am
12:00 i
:
SET CLOCK
SET CLOCK
MODE

The HEAT setting indicates the
temperature the room has to
reach before the furnace will
turn on to heat the room.
The COOL setting indicates the
temperature the room has to
reach before the air conditioner
will turn on to cool the room.
OFF indicates both heating
and air conditioning
systems are turned off.
AUTO will automatically select
heat or cool based on room
temperature demand.
Program On will activate the
stored timer operation.
(Morning, Day, Evening
& Night Periods)
Select Mode
Basic Operation
Page 6
69
HEAT
o
Pm
12:00
70
M
:
72
COOL
o
Pm
12:00
70
M
:
69
72
HEAT
COOL
AUTO
o
o
Pm
12:00
70
M
:
OFF
Pm
12:00
70
M
:
70
73
HEAT
COOL
ProgramOn
o
o
Pm
12:00
70
Day
M
:
Press
MODE
Press
MODE
Press
MODE
Press
MODE

buttons.
In any mode, adjust the
desired Set Temperature
with
Pressing the up/down buttons in Auto mode will adjust both the heat and cool
set temperatures simultaneously.
Pressing the up/down buttons in Heat or Cool modes will adjust only the
heat or cool set temperature.
Select Desired Temperature
Fan
Operation
Page 7
Basic Operation
69
72
HEAT
COOL
AUTO
o
o
Pm
12:00
70
M
:
Fan On indicates constant fan operation.
This feature is active even if the thermostat
is set to Off.
55
85
HEAT
COOL
o
o
Pm
12:00
65
S
:
Fan On
Press
FAN

Programming 4 Time Periods
Page 8
Press the PROGRAM button to enter time period programming.
Continued
Select the day of week
Adjust the start time
for Morning.
Adjust the heating
setpoint for Morning.
Adjust the cooling
setpoint for Morning.
(M - S)
(35 - 99 )
(35 - 99 )
M
Start
Am
7 30
Morning
M
:
74
COOL
o
Am
7 30
Morning
M
:
72
74
HEAT
COOL
o
o
Am
7 30
Morning
M
:
Use the back cover Programming Worksheet to help with this section.
Press
PROGRAM
Press
MODE
Press
MODE
Press
MODE
Press
MODE

Programming 4 Time Periods
Page 9 Continued
Adjust the start time
for Evening.
Adjust the cooling
setpoint for Evening.
Adjust the start time
for Day.
Adjust the heating
setpoint for Day.
Adjust the cooling
setpoint for Day.
(35 - 99 )
(35 - 99 )
(35 - 99 )
Start
Am
I0 30
Day
M
:
Start
Pm
5 30
Evening
M
:
Day
75
COOL
o
Am
I0 30
M
:
Evening
75
COOL
o
Pm
5 30
M
:
Day
73
75
HEAT
COOL
o
o
Am
I0 30
M
:
Press
MODE
Press
MODE
Press
MODE
Press
MODE
Press
MODE

Programming 4 Time Periods
Page 10
Continued
Adjust the heating
setpoint for Night
Adjust the heating
setpoint for Evening.
Adjust the cooling
setpoint for Night.
Adjust the start time
for Night.
Start
Pm
I I 30
Night
M
:
Night
78
COOL
o
Pm
I I 30
M
:
Pm
5 30
Evening
M
:
73
75
HEAT
COOL
o
o
Night
70
78
HEAT
COOL
o
o
Am
I I 30
M
:
(35 - 99 )
(35 - 99 )
(35 - 99 )
Press
MODE
Press
MODE
Press
MODE
Press
MODE

Programming 4 Time Periods
Page 11
py
18:no
co
T
:
Select Yes or No to copy
the previous day’s
program to this day.
Yes
No
If Yes is selected:
If No is selected:
Selecting Yes, then pressing mode will copy the
previous day’s program and then will ask the
same copy question again. If yes is selected
each time, this routine will repeat.
The copy command becomes available after
programming the entire previous day.
If No is selected, as in previous steps, flashing prompts for input will appear for
the 4 time periods for the next day.
Press
MODE
Press
MODE

Advanced Setup
Page 12 Continued
Select reversing
valve type, O or B.
3
Setup
o
hp
Press the Mode button.
While holding the Mode,
press the Program button
to enter Setup screens.
Before entering Advanced Setup, use the Mode button to place the unit in OFF.
These steps are normally set up by the installer. Setting these values
incorrectly may result in improper operation. Setup steps 1 & 2 are found in
the clock set section.
NOTE: Each step # is located at
the top right corner of the
display for easy reference.
B
O
page 17
page 21
page 17
Press
MODE
PROGRAM
MODE
Select Dual Fuel
operation, (On), or
Advanced Heat
Pump operation, (Off).
Adjust the Changeover
or Balance Point for
the outside sensor.
4
5
OFF
OFF
Setup
Setup
bf
eh
On
On
Off
Off
6
Setup
35
6p
Press
MODE
Press
MODE
Press
MODE
Outside
( 32 - 85F, OF=no sensor)
( 0 - 30C)
Select Electric Heat On
or Off. (Step 5 only
appears if Step 4 is set to
ON).

Advanced Setup
Page 13 Continued
Adjust the deadband
for the 1st stage.
Adjust the deadband
for the 2nd stage.
Adjust the deadband
for the 3rd stage.
(1 - 6)
(0 - 10)
(0 - 10)
Adjust the minimum
number of minutes
stage 1 must be on,
before stage 2 turns
on.
Adjust the minimum
number of minutes
stage 2 must be on,
before stage 3 turns
on.
(0 - 60)
(0 - 60)
I0
I I
Setup
Setup
0:02
0:02
7
8
9
Setup
Setup
Setup
86 I
86 2
86 3
8
8
8
8
2
2
2
2
3
Press
MODE
Press
MODE
Press
MODE
Press
MODE
Press
MODE

Advanced Setup
Page 14 Continued
Adjust the minimum
difference between
cooling & heating
setpoints.
Select the cycles per
hour limit.
d=cycles per hour
limit defeated.
d1=d + defeat 5 min.
Compressor lockout.
(0 - 6 )
(d, d1, 2 - 6)
cy
I3
Setup
6
I2
HEAT
COOL
Setup
2
81f
Press
MODE
Press
MODE
Adjust the programmable
fan timer.
0 - 60 minutes.
0:00 = off
Fan On
Fan On
Fan On
I4
Setup
Setup
0:00
:
Press
MODE
Press
MODE
Press
MODE
I5
I6
Am
Pm
ON
OFF
7:00
9:00
Adjust the programmable
fan start time. (step 15
appears only if step 14
is not 0:00)
Adjust the programmable
fan stop time. (step 16
appears only if step 14
is not 0:00)
page 19

Advanced Setup
Page 15
Reset the Energy Watch
Heat demand
hour counter.
Reset the Energy Watch
Cool demand
hour counter.
Adjust the number of
hours the blower will
run before the Service
Filter icon appears on
the display. 0 = off.
Reset the Service Filter
counter to 0, to remove
the icon from the display.
(0 - 1950)
2 I
ServiceFilter
Setup
500
20
ServiceFilter
Setup
0
I8
I9
Setup
Setup
HEAT
COOL
0
0
Press
MODE
Press
Press
Press
FAN
FAN
FAN
Press
MODE
Press
MODE
Press
MODE
Press
MODE
Select the display back-
light always On, or Off
after 8 seconds.
I7
Setup
On
L I
On
Off
Continued

Select thermostat
operation in degrees
Fahrenheit or
Centigrade.
F
C
Setup
f
22
To Exit
Press
PROGRAM
Advanced Setup
Page 16
Step # Description Range Factory Default
1 Time of day clock set 24 hour 12:00 Am
2 Day of the week Sun - Sat Monday
3
4 Dual Fuel(on),Advanced Heat Pump(off) Off / On Off
5 Electric Heat Off / On On
6 Changeover Balance Point 32-85,OF 35
7
12
13
14 Programmable Fan
17
18
19
20 Reset Service Filter icon - - - -
21 Service Filter run time set 0 - 1950 500
22
Reversing Valve polarity O / B O
Deadband, Temperature swing 1st Stage 1 - 6 2
8 Deadband, Temperature swing 2nd Stage 0 - 10 2
9 Deadband, Temperature swing 3rd Stage 0 - 10 2
10 Minutes Between Stages 1 & 2 0- 60 2
11 Minutes Between Stages 2 & 3 0- 60 2
Forced minimum difference heat/cool 0 - 6 2
Cycles per hour d, d1, 2 - 6 6
0:00 - 0:60 0:00
15 Programmable Fan Start Time 24 hour 7:00 Am
16 Programmable Fan Stop Time 24 hour 9:00 Pm
Thermoglow backlight Off / On On
Energy Watch - Heat Timer 0 - 1999 0
Energy Watch - Cool Timer 0 - 1999 0
Fahrenheit or Centigrade F / C F
Advanced Setup Table

About Advanced Features & Operation
Page 17
DUAL FUEL Vs. ADVANCED HEAT PUMP - Advanced Setup Step
# 4 allows this thermostat to be configured to control 2 heat
sources (Dual Fuel) or, to have maximum flexibility in controlling
multi-stage heat pumps (Advanced Heat Pump).
Dual Fuel systems utilize an outdoor temperature sensor.
When the outdoor temperature is at or below the Changeover
Balance Point, advanced setup step #6, page 12, the primary
heat source is ‘locked out’ and the heat source connected to
W3 is energized. There is a 3 degree deadband from the
Changeover Balance Point, which requires the outdoor
temperature to rise 3 degrees before switching back to the
primary heat source.
Advanced Heat Pump operation allows maximum flexibility
when controlling multi-stage heat pumps. Turn on times
between stages, between deadbands are installer adjustable.
When used with an outdoor temperature sensor, the 3rd
stage is ‘locked out’ unless the outdoor temperature is at
or below the adjustable Changeover Balance Point. If an
outdoor temperature sensor is not installed, the 3rd stage
is locked out.
Note: Adjusting the Changeover Balance Point to ‘OF’ will allow
3rd stage operation without an Outdoor sensor. Page 12,#6.
MEMORY BACKUP - In the event of a power loss, the
thermostat will retain the stored program settings without
external power or batteries.
MINIMUM HEAT/COOL SETPOINT DIFFERENCE - The Heat
and Cool setpoints will not be allowed to come any closer
to each other than the value set in Advanced Setup step
# 12, on page 14. This minimum difference is enforced
during Auto changeover operation.
and Program On

About Advanced Features & Operation
Page 18
MULTI-STAGE OPERATION - Control up to 3 Heat, 2 Cool Stages.
The 2nd Stage of heat or cool is
(A) the 1st Stage has been on meeting time required page13
(adjustable from 0-60 minutes, the default is 2) and
(B) the temperature spread
greater than: the setpoint
turned on when:
,#10
from the setpoint is equal to or
plus the deadband, plus the 2nd
deadband, (this 2nd deadband is adjustable from 0-10 degrees,
the default is 2).
The 3rd Stage of Heat is turned on when:
The thermostat must be configured as a Advanced Heat Pump Thermostat,
Advanced Setup Step #4, off, page 12.
(A) the 2nd stage has been on meeting time required, page 13,
step #11, (also adjustable from 0-60 minutes, default = 2),
(B) the temperature from 2nd stage turn on plus the 3rd
deadband, (this 3rd deadband is adjustable from 0-10
degrees, the default is 2). and
(C) the outside temperature is at or below the changeover
balance point, Advanced Setup Step #6, page 12.
Heat
Setpoint
Cool
Setpoint
Deadband Deadband DeadbandDeadbandDeadband
db 1 db 1db 2 db 2db 3 (adj. 1-6)(adj. 0-10)(adj. 0-10) (adj. 0-10)(adj. 1-6)
1st Stage
turn on
2nd Stage
turn on
3rd Stage
turn on
1st Stage
turn on
2nd Stage
turn on
Heating Cooling
The above figure assumes the minimum on time for the prior
stage has been met to allow the next stage to turn on,
once the deadbands have been exceeded and outside
temperature is below the changeover balance point.

About Advanced Features & Operation
Page 19
PROGRAMMABLE FAN - If the Programmable Fan timer is
set to a value other than 0:00, the fan will run for the
preprogrammed amount of time,
The Programmable Fan timer will start the fan at the top
of each hour. The Programmable Fan may be active
even if the thermostat mode is Off. Steps 15 & 16
restrict the hours in which Programmable Fan may
operate. Step# 15, page 14 is the start time and step# 16
is the stop time. Setting the times to the same setting
in both steps 15 & 16 will allow Programmable Fan to
operate 24 hours a day.
page 14, step# 14.
EMERGENCY HEAT - Is a feature available to this
thermostat. To turn on Emergency Heat press in the
Fan button. While holding the Fan button press
Up button for 2 seconds. The Cool setpoint display
will read ‘EH’.
During Emergency Heat the thermostat will turn
on the fan and the 2nd & 3rd stage of heat, when there
demand for heat, locking out the 1st stage compressor.
Exiting Emergency Heat is the same as entering. During
Emergency Heat only OFF and HEAT are available.
the
is a
Press for
Emergency Heat
FAN
74
eh
HEAT
o
Am
12:00
73
Mo
: