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Big Blue Universal Thermostat with
Automatic Heat/Cool Changeover Option
Single Stage, Multi-Stage, Heat Pump
Installation and Operating Instructions for Model:
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS
CAREFULLY BEFORE INSTALLING OR OPERATING THIS
CONTROL COULD CAUSE PERSONAL INJURY AND/OR
PROPERTY DAMAGE.
APPLICATIONS
THERMOSTAT APPLICATION GUIDE
Description
Heat Pump (No Aux. or Emergency Heat) Yes
Heat Pump (with Aux. or Emergency Heat) Yes
Systems with up to 3 Stages Heat, 2 Stages Cool Yes
Heat Only Systems Yes
Millivolt Heat Only Systems – Floor or Wall Furnaces Yes
Cool Only Systems Yes
Gas or Oil Heat Yes
Electric Furnace Yes
Hydronic (Hot Water) Zone Heat – 2 Wires Yes
Hydronic (Hot Water) Zone Heat – 3 Wires Yes
Wired Remote Temperature Sensor (Indoor/Outdoor) Yes
Dual Fuel Feature (Heat Pump Mode) Yes
SPECIFICATIONS
Electrical Rating:
Battery Power.......................... mV to 30 VAC, NEC Class II, 50/60 Hz or DC
Input-Hardwire ......................... 20 to 30 VAC
Terminal Load ............................. 1.5A per terminal, 2.5A maximum all terminals combined
Setpoint Range ............................ 45 to 99°F (7 to 37°C)
Differential (Single Stage) .................... Heat 0.6°F; Cool 1.2°F
Differential (Multi-Stage) ..................... Heat 0.6°F; Cool 1.2°F
Differential (Heat Pump) ..................... Heat 1.2°F; Cool 1.5°F
Operating Ambient.......................... 32°F to +105°F (0 to +41°C)
Operating Humidity ......................... 90% non-condensing max.
Shipping Temperature Range ................. -4 to +150°F (-20 to +65°C)
Dimensions Thermostat...................... 4-9/16"H x 5-13/16"W x 1-3/16"D
Model Programming Choices
1F95-1277
Non-Programmable 5/1/1 Day 7 Day
1F95-1277 Touchscreen Thermostat
CA UTION
To prevent electrical shock and/or equipment damage,
disconnect electric power to system at main fuse or
circuit breaker box until installation is complete.
Index Page
Installation 2
Wiring Connections 2
Thermostat Quick Reference 3
Operating Your Thermostat 7
Programming 7
Troubleshooting 11
ATTENTION: MERCURY NOTICE
This product does not contain mercury. However, this
product may replace a product that contains mercury.
Mercury and products containing mercury must not be
discarded in household trash. Do not touch any spilled
mercury. Wearing non-absorbent gloves, clean up any
spilled mercury and place in a sealed container. For proper
disposal of a product containing mercury or a sealed
container of spilled mercury, place it in a suitable shipping
4
www.mammoth-inc.com
container. Refer to www.thermostat-recycle.org for
location to send the product containing mercury.
PART NO. 37-6753D
Replaces 37-6753C
1150
2 "AA" Batteries
INSTALLATION
Mounting
Hole
Mounting
Hole
Place Level
across
Mounting Tabs
(for appearance only)
Place Level
across
Mounting Tabs
(for appearance only)
+
S
-
W/E
6
L
WARNING
!
Thermostat installation and all components of the
control system shall conform to Class II circuits per
the NEC code.
Remove Old Thermostat
A standard heat/cool thermostat consists of three basic parts:
1. The cover, which may be either a snap-on or hinge type.
2. The base, which is removed by loosening all captive
screws.
3. The switching subbase, which is removed by unscrewing
the mounting screws that hold it on the wall or adapter
plate. Before removing wires from old thermostat, label
each wire with the terminal designation from which it
was attached. Disconnect the wires from the old thermo-
stat one at a time. Do not let wires fall back into the wall.
Installing New Thermostat
1. Pull the thermostat body off the thermostat base. Forcing
or prying on the thermostat will cause damage to the unit.
2. Place base over hole in wall and mark mounting hole
locations on wall using base as a template.
3. Move base out of the way. Drill mounting holes. If you
are using existing mounting holes and the holes drilled
are too large and do not allow you to tighten base snugly,
use plastic screw anchors to secure the base.
4. Fasten base snugly to wall using mounting holes shown
in Figure 1 and two mounting screws. Leveling is for
appearance only and will not affect thermostat operation.
5. Connect wires to terminal block on base using appropriate
wiring schematic (see diagram sheet 37-6808).
6. Push excess wire into wall and plug hole with a re resistant material (such as berglass insulation) to prevent
drafts from affecting thermostat operation.
7. Carefully line the thermostat up with the base and snap
into place.
Battery Location
2 "AA" alkaline batteries are included in the thermostat at
the factory with a battery tag to prevent power drainage.
Remove the battery tag to engage the batteries.
To replace batteries, set system to OFF, remove thermostat
from wall and install the batteries in the rear along the top
of the thermostat (see Figure 1). For best results, use a
premium brand "AA" alkaline battery such as Duracell
Energizer
®
.
Figure 1 – Thermostat Base Multi-Stage 1F95-1277
Rear view of thermostat
®
or
WIRING CONNECTIONS
Refer to equipment manufacturers' instructions for specic
system wiring information. After wiring, see CONFIGURA-
TION section for proper thermostat conguration.
TERMINAL DESIGNATION DESCRIPTIONS
Terminal Designation Description
B ...................Changeover valve for heat pump energized constantly in heating
O ...................Changeover valve for heat pump energized constantly in cooling and off
Y2 ...................2nd Stage Compressor
Y ...................Compressor Relay
G ...................Fan Relay
RC...................Power for Cooling
RH...................Power for Heating
C ...................Common wire from secondary side of cooling (Optional). Required for fault indication,
continuous backlight operation or remote temperature sensor operation
L ...................Malfunction indicator for systems with malfunction connection
6 ...................Powered closed 3rd wire for 3-wire zone valve
W/E ..................Heat Relay/Emergency Heat Relay (Stage 1)
W2...................2nd Stage Heat (3rd Stage Heat in HP2)
Blank..................Blank
-....................Common (DC) for wired remote temperature sensor
S ...................Frequency signal from remote temperature sensor
+ ...................Power (DC) to remote temperature sensor
2
For wiring diagrams, see 37-6808.
Wiring diagrams shown are for typical systems and describe
the thermostat terminal functions.
Time of Day
Day of Week
Room
Temperature
System
Switch
Fan
Switch
Indicates when
thermostat is calling
for Heat or Cool
Battery Level Indicator
Indicating the current power level
of the 2 “AA” batteries.
Full power remaining.
Half power remaining.
Change The batteries should be replaced at this time.
Menu key for entering
different modes such as
Cleaning, Configuration, Set
Time and Set Schedule
Enters comfort
temperature settings
into the schedule
Temperature
UP/Down used for
modifying set point
as well as to
navigating the menus
Set Temperature
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13
16
15
14
13
12
11
10
9
8
76
54
3
2
1
THERMOSTAT QUICK REFERENCE
Home Screen Description
Figure 2 – Home Screen Display
Programming and Conguration Items
Displays and "Keypad Lockout" when in keypad
lockout mode.
Displays
Lockout" when limited range is activated and locked.
Displays only "Temperature Limit" when limited range
is activated.
Indicates period of day being programmed.
RUN SCHEDULE (run program) button.
SET TIME button or HOLD temperature button.
Displays "Change Filter" when the system has run
for the programmed lter time period as a reminder
to change or clean your lter.
COPY button or INSTALLER CONFIG button.
CLEAN DISPLAY button allows 30 seconds to wipe off
the display or ADVANCE DAY button for programming.
Used in programming to set time and in conguration
menu to change selections.
"Hold Until" indicates the time when a temporary hold
period will end.
"Hours" and "Days" displays during steps in installer.
The words "Hold At" are displayed when the thermo-
stat is in the HOLD mode. "Temporary Hold At" is
displayed when the thermostat is in a temporary HOLD
mode.
"Call For Service" indicates a fault in the heating/
cooling system. It does not indicate a fault in the
thermostat.
"System On" indicates when heating or cooling stage
is energized. "+2" also indicates when a second stage
is energized.
and "Temperature Limit" and "Keypad
Figure 3 – Programming & Conguration Items
"Copy" indicates the copy program feature is being
used during programming.
A steady "Cool Savings" display indicates the feature
is enabled in the installer menu. A ashing "Cool Savings" display indicates the feature is active.
"Remote" indicates that the indoor remote tempera-
ture sensor, is being accessed. "Outdoor Remote"
indicates the outdoor remote temperature sensor is
being accessed.
3
INSTALLER/CONFIGURATION MENU
To enter the menu: Press the Menu touch key. Press and hold for 5 seconds the Installer Cong touch key. This displays
menu item #1 in the table below. Press
or
to change a menu item.
Installer Note: To default the programming, clock and Conguration Menu to the Factory Default Settings, press the
and SYSTEM keys simultaneously. The thermostat display will go blank for a few seconds, and then all segments will display
momentarily. For heat pump systems, Conguration Menu item 1 must be set to match the heat pump system.
Menu
Reference
Number
Program-
mable
1 1 1 MS 2 HP 1, HP 2, SS 1 Selects Multi-Stage (MS 2, No Heat Pump), Heat Pump 1
2 2 2
3 3 3
4 4 NA
5 5 4
6 6 NA
7 7 5
8 8 6
9 9 7
10 10 8
11 11 9
12 12 10
13 13 11
14 14 12
15 15 13
16 16 14
17 17 15
18 18 16
19 19 17
20 20 18
21 21 19
22 22 20
23 23 21
24 24 22
25 25 23
26 26 24
27 27 25
Non-
Program-
mable
Press
Button
4
to advance to the next menu item or to return to a previous menu item. Press
,
CONFIGURATION MENU
Displayed
(Factory
Default)
(ELE) GAS GAS setting: furnace controls blower
Days, (7) P 5-1-1 or 0 Programs per week. (0 = non-programmable)
PS (4) 2 Program periods per day
Cool-Off-
Heat-Auto
Cool-Off-Heat-
Emer-Auto
E (On) OFF Selects Energy Management Recovery, E (with programming option on)
Cr, Heat (FA) SL Selects Adjustable Anticipation, cycle rate, Heat
Cr, Cool (FA) SL Selects Adjustable Anticipation, cycle rate, Cool
Cr/AU, Emer (FA) SL Selects Adjustable Anticipation, cycle rate auxiliary, (This item is
CL (OFF) On Selects Compressor Lockout
dL (On) OFF Selects Continuous Display backlight & intensity
dL (LO) HI Selects Backlight Intensity
0 4, LO to 4, HI Selects Adjustable Ambient Temperature Display [range -4 (LO)
°F °C Selects °F/°C Display (temperature units in Fahrenheit or Celsius).
b (On) OFF Selects audible Beeper On/Off
dS (On) OFF Selects Daylight Saving Time calculation
AS, Heat (On) OFF Selects Automatic Schedule for comfort temperature Programming,
AS, Cool (On) OFF Selects Automatic Schedule for comfort temperature Programming,
CS, (OFF)
Cool Savings
HL, Heat (99) 62-98 TEMPERATURE LIMIT, HEAT (max. heat set point)
LL, Cool (45) 46-82 TEMPERATURE LIMIT, COOL (min. cool set point)
OFF,
Keypad Lockout
000 001-999 Selects Keypad Lockout Combination (active only if keypad Lockout
FS, Heat (On) OFF Fast second stage of heat (not available if SS1 is selected above)
FS, Cool (On) OFF Fast second stage of cool (not available if SS1 or HP1 is selected
Remote (OFF) On Remote temperature sensor, enable/disable
In, Remote Outdoor Remote Remote temperature sensor (Indoor/Outdoor)
LS (On) OFF Local temp. Sensor enable/disable (only when Indoor Remote is
dF (5) 5-50 Selects Dual Fuel Feature & set point (in Fahrenheit) (applicable only
Cd (60) 0-99 Selects Compressor delay in seconds (only when dF is selected >5)
Change Filter
(OFF)
200 Hours 25-1975
Press
or to
select from listed
options Comments
(HP 1, 1 compressor), Heat Pump 2 (HP 2, 2 compressor
or 2 speed compressor), or Single Stage
ELE setting: thermostat controls blower
4 = Morning, Day, Evening, Night
Cool-Off-Heat,
Off-Heat, Cool-Off
Cool-Off-Heat-Emer,
Off-Heat-Emer,
Cool-Off
1-2-3-4-5-6 Selects Cool Saving Feature & amount
L (total), P (partial),
Temperature Limit
(limited temperature
range)
On Selects Change lter feature
(in increments
of 25 hours)
2 = Day, Night
System switch conguration in non heat pump mode
System switch conguration, heat pump mode
only to appear if HP 1 or HP 2 is selected above)
to +4 (HI)]
heat mode
cool mode
Selects Keypad Lockout
is selected).
above)
selected On).
when HP1 or HP2 is selected)
Change lter, duration hours
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