WARNING
Important Safety Information
1
Replacing Existing Thermostat
• Always turn off power to the air conditioning or heating system prior to
installing, removing, cleaning or servicing thermostat.
• This thermostat is a dual power thermostat and either requires 24 Volts AC
Power or two (2) properly installed “AA” alkaline batteries for normal operation
and control of the heating or cooling system. Refer to “Low Battery Detection
and Replacement” section for more information.
• This thermostat also requires two (2) properly installed “AA” alkaline batteries
to retain clock setting in the event of loss of AC Power due to a power outage
or rolling blackouts when used as a hardwired thermostat.
• This thermostat should only be used as described in this manual. Any other
use is not recommended and will void the warranty.
Specifications
Installation
Testing Your New Thermostat
Programming User Settings
Temperature Adjustment
Additional Operation
Features
Battery Replacement
Troubleshooting
Wiring Diagrams
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2
3
4
5
6
7
8
9
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Specifications
• Electrical Rating: 24 Volt AC (18-30 Volt AC)
1 amp maximum load per terminal
2 amp total maximum load (all terminals) (Model TT-P-411)
3 amp total maximum load (all terminals) (Model TT-P-421)
• Control Range: 45˚ - 90˚ F (7˚ - 32˚ C)
• Accuracy: +/- 1˚ F (+/- .5˚ C)
• AC Power: 18-30 Volt AC
• DC Power: 3.0 Volt DC (2 AA Alkaline batteries included)
• Model TT-P-411: Compatibility with low voltage single stage gas, oil or
electric heating or cooling systems, including single stage heat pumps; can
also be used on 250mv to 750mv millivolt heating only systems.
• Model TT-P-421: Compatibility with low voltage multi-stage gas, oil or
electric heating or cooling systems, including multi-stage heat pumps.
• Model TT-P-411 Terminations: Rc, Rh, B, O, Y, W, G, C
• Model TT-P-421 Terminations: R, O, B, C, Y1, E/W1, G, W2
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Specifications
cont.
Installation
2
Before Installing, Programming or Operating,
PLEASE READ ALL INSTRUCTIONS
Old Terminal from
Existing Thermostat
New Terminal for
New Thermostat
(TT-P-411)
New Terminal for
New Thermostat
(TT-P-421)
Terminal
Description
V or Rc Rc Cooling
Transformer
M, 4, Rh, or R Rh Heating
Transformer
R, V-VR or VR-R R 24 VAC
B B B Reversing Valve
(Heating)
O O O Reversing Valve
(Cooling)
Y, Y1 or M Y Y1 Cooling or
Compressor for
HP System
E, H, W, W1 or 4 W E/W1 1st Stage Heat
or Emergency Heat
G or F G G Fan Control
C, X or B C C 24 VAC Common
W1, W2 or W-U W2 2nd Stage Heat
Most thermostats have three parts:
• The cover, which may snap or hinge over the existing thermostat.
• The electronics or body, which controls the existing system.
• The sub-base, where the wires attach through the wall to the existing system.
1. Always turn off power to the air conditioning or heating system prior to
removing existing thermostat.
2.
Carefully remove the cover and electronics body from the old thermostat sub-base.
Depending on the brand, these parts may pull off or need to be unscrewed. The
old sub-base should remain wired and on the wall until steps 4 and 5.
3. Label every old wire with the letter of the connection to which the wire is
attached. Example letters are R, M, Y etc. Depending on the brand of the old
thermostat, your letters may be different.
4. After labeling the old wires, loosen each connection and remove them from old
sub-base. Secure the wires to prevent them from slipping into the hole in the wall.
5. Remove the old sub-base from the wall, again being careful that the wires do
not slip into the hole in the wall.
6. Use the chart below to determine the new thermostat connections. As an
example, if the old thermostat had a G connection, it goes to G on the new
thermostat. Note the chart includes information for TopTech TT-P-411 and
TT-P-421 thermostats. Be sure to use the correct column for the new thermostat.
Programmable Thermostats
Single Stage Heat / Cool
Conventional and Heat Pump
Multi-Stage 2 Heat / 1 Cool
Conventional and Heat Pump
TT-P-411
TT-P-421
®
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