Bestech BT21NP - User Manual

Warning
Turn off power to the heating or cooling
equipment before installation.
Attention
For installation by experienced service
technicians only. Follow applicable codes.
This thermostat is compatible with:
  • Singlestageheat/coolconventionalandheatpumpsystems
  • Conventionalsystemsupto2heat/1cool(BT21NPonly)
  • Singlecompressorheatpumpsystemswithanauxiliaryheatstage(BT21NPonly)
  • 250–750millivoltheatonlysystems
Electrical and control specifications:
 •ElectricalRating:24VoltAC
  •1ampmaximumloadperterminal
  •ACPower:18–30VoltsAC
  •DCPower:3.0VoltDC(2“AA”AlkalineBatteriesIncluded)
  •ControlRange:45°–90°F(7°–32°C)
  •TemperatureAccuracy:+/-1°F(+/-.5°C)
Terminations
  •BT11NP–Rc,Rh,O,B,Y,W,G,C
  •BT21NP–R,O,B,Y1,E/W1,G,W2,C
1
Specifications
BTNP-100-03
1 Specifications
2 Installation
3 Setting User Options
4
Operating Your Thermostat
5 Additional Operation Features
6 Thermostat Maintenance
This thermostat requires 24 Volt AC Power or two (2) properly installed
“AA” Alkaline batteries for proper operation. When connecting 24 Volt
AC Power the batteries may be installed as a backup.
For use only as described in this manual. Any other use will
void warranty.
Read all instructions before proceeding.
Non-Programmable Thermostats
BT11NP
Single Stage Heat Cool
ConventionalandHeatPump
BT21NP
Up to 2 Heat / 1 Cool
ConvencionalandHeatPump
Model number
is located on
thermostat
sub-base.

Summary

Specifications

Terminations

Lists terminal designations for BT11NP and BT21NP models.

Installation

Thermostat Location

Recommends placement for optimal air circulation and average room temperature.

Connect Your Wires

Conventional Systems Wiring

Details typical wiring configurations for conventional systems.

Heat Pump Systems Wiring

1 Heat;1 Cool No Auxiliary Heat Wiring

Wiring for heat pump systems with one stage of heat.

2 Heat;1 Cool Auxiliary Heat Wiring

Wiring for heat pump systems with two stages of heat.

Set Installer Switches

Attach Thermostat to Sub-Base

Setting User Options

Temperature Differential Settings

Explains differential settings for 1st and 2nd stage heating/cooling.

Operating Your Thermostat

Setting the System Control Mode

Explains how to select heating, cooling, or off modes.

Setting the Fan Control Mode

Explains how to select fan operation (Auto or On).

Temperature Adjustment

Describes how to adjust the set point temperature.

Status Indicators

Explains display icons for heating, cooling, and auxiliary status.

Resetting the Thermostat

Details how to reset the thermostat to factory defaults.

Additional Operation Features

Compressor Protection

Explains automatic delay to prevent compressor damage from short cycling.

Thermostat Maintenance

Changing the Batteries

Instructions for replacing low battery indicators.

Thermostat Cleaning

Guidelines for cleaning the thermostat exterior.

Bestech BT21NP Specifications

General

Brand	Bestech
Model	BT21NP
Category	Thermostat
Language	English