Table of Contents
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Single Stage Heat / Cool
TT-N-411
Conventional and Heat Pump
Multi-Stage 2 Heat / 1 Cool
TT-N-421
Conventional and Heat Pump
Before Installing, Programming or Operating,
PLEASE READ ALL INSTRUCTIONS
Specifications
1
2
3
4
5
WARNING
Important Safety Information
• 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 should only be used as described in this manual. Any other
use is not recommended and will void the warranty.
1
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-N-411)
3 amp total maximum load (all terminals) (Model TT-N-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)
®
Additional Operation
6
Features
7
8
9
1
Specifications
• Model TT-N-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-N-421: Compatibility with low voltage multi-stage gas, oil or
electric heating or cooling systems, including multi-stage heat pumps.
• Terminations, Model TT-N-411: Rc, Rh, B, O, Y, W, G, C
• Terminations, Model TT-N-421: R, O, B, C, Y1, E/W1, G, W2
2
Installation
Replacing Existing Thermostat
1. Always turn off power to the air conditioning or heating system prior to
removing existing thermostat.
2. Remove the cover of your old thermostat and locate the wire terminals.
Do not remove wires from terminals yet.
3. Using small pieces of masking tape, label wires prior to removal from
terminals. Use the chart below to determine the new terminal designations
for your new thermostat.
Old Terminal from
New Terminal for
Existing Thermostat
New Thermostat
(TT-N-411)
V or Rc
Rc
M, 4, Rh, or R
Rh
R, V-VR or VR-R
B
B
O
O
Y, Y1 or M
Y
E, H, W, or 4
W
G or F
G
C, X or B
C
4. After labeling and removing all wires from terminals, unscrew the existing
thermostat sub-base from wall. Secure wires to prevent them from slipping
into the hole in the wall.
NOTE–MODEL TT-N-411: This thermostat is designed for use with 24 Volt-AC low
voltage single stage gas, oil or electric heating or cooling systems, including
single stage heat pumps and can also be used on 250mv to 750mv millivolt
heating only systems. Do not use this thermostat on applications with voltages
above 30 Volts AC.
NOTE–MODEL TT-N-421 This thermostat is designed for use with 24 Volt-AC low
voltage multi-stage gas, oil or electric heating or cooling systems, including
multi-stage heat pump systems. Do not use this thermostat on applications with
voltages above 30 Volts AC.
cont.
New Terminal for
Terminal
New Thermostat
Description
(TT-N-421)
Cooling
Transformer
Heating
Transformer
R
24 VAC
B
Reversing Valve
(Heating)
O
Reversing Valve
(Cooling)
Y1
Cooling or
Compressor for
HP System
E/W1
1st Stage Heat
or Emergency Heat
G
Fan Control
C
24 VAC Common
1
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Table of Contents
Troubleshooting
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Related Manuals for Toptech TT-N-411
Summary of Contents for Toptech TT-N-411
- Page 1 Specifications cont. ® • Model TT-N-411: Compatibility with low voltage single stage gas, oil or Non-Programmable Thermostats electric heating or cooling systems, including single stage heat pumps, can also be used on 250mv to 750mv millivolt heating only systems. • Model TT-N-421: Compatibility with low voltage multi-stage gas, oil or electric heating or cooling systems, including multi-stage heat pumps.
- Page 2 Installation Installation cont. cont. NOTE: If the thermostat was powered (batteries installed) prior to accomplishing Installing Your New Thermostat steps 14 through 16, you will need to reset the thermostat to register thermostat NOTE: If installing this thermostat in a new installation, locate the thermostat switch configurations prior to programming any user settings.
- Page 3 1. Press and hold the or button for more than 1 second. The entire display will flash once and the SET indicator NOTE–MODEL TT-N-411: Once you have finished setting the first stage will be flashing. Release the or button and press differential, you can wait 5 seconds and the thermostat will return to the normal the or button again to adjust the set temperature.
- Page 4 Additional Operation Features Additional Operation Features cont. Status Indicators Compressor Protection Feature HEAT: This will turn on whenever the system switch This thermostat includes an automatic compressor protection feature to avoid is in the HEAT mode. “HEAT” will flash when the potential damage to the system from short cycling.
- Page 5 See Section 7. If AC power is present, call a professional service technician to verify thermostat and system performance. MODEL TT-N-411: Single Stage Conventional Systems (Single Transformer) Symptom: HI is shown in the thermostat display. Potential Solution: The temperature sensed by the thermostat Rc Rh is higher than the 99˚...
- Page 6 Wiring Diagrams Wiring Diagrams cont. cont. See NOTE 2 MODEL TT-N-421: Multi-Stage Heat Pump Systems MODEL TT-N-411: Single Stage Heat Pump System Rc Rh E/W1 Factory Installed Jumper Reversing Valve (Active in Reversing Valve Emergency 2nd Stage Cooling - See...
- Page 7 Braeburn Systems LLC agrees to repair or replace at its option any TopTech thermostat under warranty provided it is returned postage prepaid to our warranty facility in a padded carton within the warranty period, with proof of the original date of purchase and a brief description of the malfunction.
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