Table of Contents
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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 BT11NP)
3 amp total maximum load (all terminals) (Model BT21NP)
• 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 BT11NP: Compatibility with low voltage single stage gas, oil or
electric heating or cooling systems, including single stage heat pumps; can
also be used on 250 to 750 millivolt heating only systems.
BT11NP
Single Stage Heat / Cool
Conventional and Heat Pump
BT21NP
Multi-Stage 2 Heat / 1 Cool
Conventional and Heat Pump
Additional Operation
6
Features
7
8
9
1
Specifications
• Model BT21NP: Compatibility with low voltage multi-stage gas, oil or electric
heating or cooling systems, including multi-stage heat pumps; can also be
used on 250 to 750 millivolt heating only systems.
• Terminations, Model BT11NP: Rc, Rh, B, O, Y, W, G, C
• Terminations, Model BT21NP: R, O, B, C, Y1, E/W1, G, W2
2
Installation
Replacing Existing Thermostat
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 BesTech
BT21NP thermostats. Be sure to use the correct column for the new thermostat.
Old Terminal from
New Terminal for
Existing Thermostat
New Thermostat
(BT11NP)
V or Rc
M, 4, Rh, or R
R, V-VR or VR-R
B
O
Y, Y1 or M
E, H, W, W1 or 4
G or F
C, X or B
W2
NOTE–These thermostats are designed for use with 24 Volt-AC low voltage gas,
oil or electric heating or cooling systems, including 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.
cont.
BT11NP and
TM
New Terminal for
Terminal
New Thermostat
Description
(BT21NP)
Rc
Cooling
Transformer
Rh
Heating
Transformer
R
24 VAC
B
B
Reversing Valve
(Heating)
O
O
Reversing Valve
(Cooling)
Y
Y1
Cooling or
Compressor for
HP System
W
E/W1
1st Stage Heat
or Emergency Heat
G
G
Fan Control
C
C
24 VAC Common
W2
2nd Stage Heat
1
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Table of Contents
Troubleshooting
Related Manuals for Bestech BT21NP
Summary of Contents for Bestech BT21NP
- Page 1 G connection, it goes to G on the new WARNING thermostat. Note the chart includes information for BesTech BT11NP and BT21NP thermostats. Be sure to use the correct column for the new thermostat. Important Safety Information New Terminal for Terminal...
- Page 2 On heat pump systems you must wait 5 minutes for the automatic compressor short NOTE: (BT21NP) For heat pump systems, the fan option switch should be set cycle protection period to expire, or press the RESET button to bypass this according to the second stage heating system type.
- Page 3 2˚, 3˚, 4˚, 5˚ or 6˚ F (1˚, 1.5˚, 2˚, 2.5˚ or 3˚ C). Temperature Scale ˚F or ˚C dependent on switch setting NOTE – MODEL BT21NP: Once you have finished setting the second stage Low Battery Warning Off, to be renewed within 5 seconds.
- Page 4 RESET button. This will erase all user program settings, returning all settings to their default values. This should only be used during installation for testing AUX (Model BT21NP Only): This will turn on when the purposes or to reset a thermostat to regain normal operation.
- Page 5 120 VAC Symptom: NO AUX SET is shown in the thermostat display. (model BT21NP only) Potential Solution: The thermostat (model BT21NP) NOTES: only) is configured for a conventional system, and the system 1. Transformer common not required for battery-only operation of switch is in the EM HEAT position.
- Page 6 Wiring Diagrams Wiring Diagrams cont. cont. See NOTE 2 MODEL BT21NP: Multi-Stage Heat Pump Systems MODEL BT11NP: 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 Reference Non-Programmable Thermostats Baker Distributing warrants each new BesTech thermostat against any defects that are due to faulty material or workmanship. This warranty and our liability does not apply to batteries, nor does it include damage to merchandise or the thermostat resulting from accident, alteration, neglect, misuse, improper installation or any other failure to follow BesTech installation and operating instructions.
Need help?
Do you have a question about the BT21NP and is the answer not in the manual?
Questions and answers
On my Bestech Thermostat Model BT21NP I can not change the set temperature. What could be the problem?
If you cannot change the set temperature on your Bestech Thermostat Model BT21NP, it may be because you are not following the correct procedure. To change the set temperature:
1. Press and hold the button for more than 1 second until the display flashes and the SET indicator appears.
2. Release the button, then press the ▲ or ▼ button to adjust the set temperature.
If this process is not followed correctly, the thermostat may not allow temperature changes.
This answer is automatically generated