Bestech BT21NP User manual

WARNING

Important Safety Information

BT11NP

Single Stage Heat / Cool

Conventional and Heat Pump

• 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.

Speciﬁcations

Installation

Testing Your New Thermostat

Programming User Settings

Temperature Adjustment

Additional Operation

Features

Battery Replacement

Troubleshooting

Wiring Diagrams

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

Speciﬁcations

cont.

Installation

Before Installing, Programming or Operating,

PLEASE READ ALL INSTRUCTIONS

BT21NP

Multi-Stage 2 Heat / 1 Cool

Conventional and Heat Pump

• 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.

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.

Replacing Existing Thermostat

Old Terminal from

Existing Thermostat

New Terminal for

New Thermostat

(BT11NP)

New Terminal for

New Thermostat

(BT21NP)

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

W2 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.

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 BesTechTM BT11NP and

BT21NP thermostats. Be sure to use the correct column for the new thermostat.

Non-Programmable Thermostats

WARNING!

Read BEFORE Testing

Installation

2cont.

Installation

2cont.

Testing Your New Thermostat

• Do not short (or jumper) across terminals on the gas valve or at the heating or

cooling system control board to test the thermostat installation. This could

damage the thermostat and void the warranty.

• Do not select COOL mode if the outside temperature is below 50˚ F (10˚ C).

This could damage the controlled cooling system and cause personal injury.

• This thermostat includes an automatic compressor protection feature to

avoid potential damage to the cooling system from short cycling. This

thermostat automatically provides a 5-minute delay after turning off the

cooling or heating system output to protect the compressor.

NOTE: Test your thermostat prior to programming any user settings. Pressing

the RESET button will erase any user entries previously programmed and return

them to their default values.

1. Place the system switch in the HEAT position.

2. Press the button on the keypad until the set point temperature setting is a

minimum of 3 degrees higher than the current room temperature. The heating

system should start within several seconds. The fan may not turn on

immediately due to the heating system built-in fan delay.

3. Place the system switch in the OFF position. The heating system should stop

within several seconds with conventional heating or cooling systems. On heat

pump systems you must wait 5 minutes for the automatic compressor short

cycle protection period to expire, or press the RESET button to bypass this

feature for initial testing purposes. Pressing the RESET button will erase any

user program settings.

4. Place the system switch in the COOL position.

5. Press the button on the keypad until the set point temperature is a minimum

of 3 degrees lower than the current room temperature.

6. The cooling system should start within several seconds. Place the system

switch in the OFF position. The cooling system should stop within a few seconds.

7. Place the fan switch in the ON position. The system blower should start.

8. Place the fan switch in the AUTO position. The system blower should stop.

NOTE: If the thermostat was powered (batteries installed) prior to accomplishing

steps 14 through 16, you will need to reset the thermostat to register thermostat

switch conﬁgurations prior to programming any user settings. Gently press

the RESET button on the front of the thermostat using a paperclip or a small

pencil tip.

NOTE – MODEL BT21NP: If the thermostat is

conﬁgured for a conventional system and the system

switch is in the EMER position, the unit will still

function in a conventional 2 stage HEAT mode, but

the display will ﬂash NO AUX SET.

Installing New Thermostat

NOTE: If installing this thermostat in a new installation, locate the thermostat

4 to 5 feet above the ﬂoor in accordance with applicable building codes. Install the

thermostat in a location that provides good airﬂow characteristics and avoid areas

behind doors, near corners, air vents, direct sunlight or heat generating devices.

Installation in these areas could impact thermostat performance. Wiring must

conform to all building codes and ordinances as required by local and national

code authorities having jurisdiction.

1. Always turn off power to the air conditioning or heating system prior to

installing thermostat.

2. Place system switch on front of thermostat to the OFF position.

3. Place fan control switch on front of thermostat to the AUTO position.

4. Remove front of thermostat body from sub-base by pressing release latch on

bottom of thermostat.

5. Place the thermostat sub-base against wall in the desired thermostat location.

6. Guide thermostat wires through hole in sub-base and continue to hold

against wall.

Mark placement of mounting holes as appropriate and drill using a 3/16" drill bit.

8. Gently tap supplied plastic anchors into the holes in the wall.

9. Place the thermostat sub-base against the wall in the desired location, making

sure the mounting holes are aligned and the thermostat wires are inserted

through the opening in sub-base.

10. Fasten sub-base to wall using supplied screws.

11.

Connect wires to quick wiring terminal block using the new terminal designations.

Refer to Wiring Diagram in section 9 of this manual for assistance.

12. Make sure all of the wire connections are secure and are not touching

any other terminal to prevent electrical shorts and potential damage to

the thermostat.

13. Turn the front thermostat body over, exposing the rear view of the circuit board.

14. Locate the internal ˚F / ˚C switch on the circuit board. Using your ﬁngers, ﬂip

the switch toward the preferred temperature ˚F / ˚C scale.

15. Locate the internal fan option switch, HG (Gas) / HE (Elec) on the circuit board.

This switch controls the heating system fan delay. Select gas for gas or oil ﬁred

systems. This will allow the furnace to run for a few seconds before initiating

the fan. Select electric for electric heat systems that require the fan to come on

immediately. Using your ﬁngers, ﬂip the switch toward HG (Gas) or HE (Elec).

NOTE: (BT21NP) For heat pump systems, the fan option switch should be set

according to the second stage heating system type.

16. Locate the internal NORM / HP switch on the circuit board. This switch

conﬁgures the thermostat for conventional (NORM) heating and cooling systems

or heat pump (HP) systems. Using your ﬁngers, gently ﬂip the switch toward

NORM or HP.

17. Attach front body of thermostat to sub-base of thermostat, being careful to

align the terminal pins on the front body with the terminal block on the sub-base.

18. Open front thermostat door and open battery compartment door.

19. Install two new "AA" alkaline batteries. Locate the positive (+) ends of the

batteries and match them with the positive (+) terminals located in the battery

compartment. Close battery compartment.

20. Restore system power so you can test installation.

Default Thermostat Settings Setting Second Stage Differential (BT21NP Only)

Setting Temperature Differentials

Review Set Temperature

cont.

Programming User Settings

The default settings for the ﬁrst and second stage differentials are compatible

with most systems and applications. This is normally set at time of installation and

usually does not require any modiﬁcation under normal operating conditions. If you

feel that your system is turning on too often, simply follow the instructions below.

NOTE: The ﬁrst and second stage differential settings are the same for both the

heating and cooling systems.

Setting First Stage Differential

The default setting is 0.5˚ F (0.25˚ C). The room temperature must change .5˚ F

(0.25˚ C) from the set point temperature before the thermostat will initiate the

system in heating or cooling.

1. In normal operating mode, press and hold the and

buttons at the same time for 3 seconds. LCD display will

show "SET D1 x˚", where "x" equals the ˚F / ˚C differential

setting. This is the current ﬁrst stage differential setting.

2. Press the or buttons to set the ﬁrst stage differential

to your desired setting of .5˚, 1˚, or 2˚ F (.2, .5˚ or 1.0˚ C).

NOTE–MODEL BT11NP: Once you have ﬁnished setting the ﬁrst stage

differential, you can wait 5 seconds and the thermostat will return to the normal

operating mode. Or you can press both the and buttons at the same time to

return to normal operating mode.

NOTE–MODEL BT21NP: If you do not wish to change the second stage

differential, you can wait 5 seconds and the thermostat will automatically return

to the normal operating mode. Otherwise, you can press both the and

buttons at the same time to return to normal operating mode.

Programming User Settings

The default setting is 2˚ F (1.0˚ C). The room temperature

must change 2˚ F (1.0˚ C) in addition to the ﬁrst stage

differential setting before the thermostat will initiate the

second stage of the system in heating.

3. Press and hold the and buttons at the same time

again and the LCD display will show "SET D2 x˚", where "x" equals the ˚F / ˚C

differential setting. This is the current second stage differential setting.

4. Press the or buttons to set the second stage differential to your desired

setting of 2˚, 3˚, 4˚, 5˚ or 6˚ F (1˚, 1.5˚, 2˚, 2.5˚ or 3˚ C).

NOTE – MODEL BT21NP: Once you have ﬁnished setting the second stage

differential, you can wait 5 seconds and the thermostat will return to the normal

operating mode. Or you can press both the and buttons at the same time to

return to normal operating mode.

NOTE: To erase all user program settings, gently press the RESET button using

a paper clip or a small pencil tip. This will return all thermostat settings to their

default values, erasing all program settings entered by the user.

Temperature Adjustment

1. Press and hold the button. The current set point

temperature will be displayed in place of the current

room temperature, and the indicator SET will be displayed.

2. The display will return to normal operating mode when

the button is released. The SET indicator will

turn off, indicating that the current temperature shown in the display is the

room temperature.

Changing Set Temperature

1. Press and hold the button for more than 1 second.

The entire display will ﬂash once and the SET indicator

will be ﬂashing. Release the button and press

the or button again to adjust the set temperature.

2. The display will return to normal operating mode after 5

seconds, or you can press both the and buttons at

the same time to return to normal operating mode.

3. The SET indicator will turn off in the display, indicating

that the current temperature shown in the display is the

room temperature.

NOTE: This thermostat has separate heating and cooling set points, which

can be reviewed or changed by selecting either HEAT or COOL with the

system switch.

Function Status After Reset

Operation Mode Normal Operating Mode

Room Temperature 70˚ F (21.0˚ C), to be

renewed within 5 seconds

Set Point Temperature According to system switch

Heat or Off: 62˚ F (17.0˚ C)

Emergency Heat (BT21NP) only):

62˚ F (17.0˚ C)

Cool: 85˚ F (29.0˚ C)

Temperature Scale ˚F or ˚C dependent on switch setting

Low Battery Warning Off, to be renewed within 5 seconds.

Off if 24V is present

1st Stage Differential 0.5˚ F (0.25˚C)

2nd Stage Differential 2˚ F (1.0˚ C)

Short Cycle Protection Timer Reset

Output Relays Off

Compressor Protection Feature

Low Battery Detection and Replacement

This thermostat includes an automatic compressor protection feature to avoid

potential damage to the system from short cycling. This thermostat automatically

provides a 5-minute delay after turning off the cooling system output to protect

the compressor. This protection is also present in the heat mode of operation on

heat pump systems to protect the compressor.

NOTE: The installer can bypass the compressor protection feature by pressing

the 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

purposes or to reset a thermostat to regain normal operation.

Additional Operation Features

This dual power thermostat requires two (2)

new, properly

installed “AA” Alkaline batteries

to provide proper thermostat

power when 24 volt AC power fails or is not connected to

the

thermostat. When the batteries start to become

too weak

to provide proper operation, the thermostat will begin to

display a 3 Stage Low Battery Indicator.

Low Battery Stage Battery Indicator Duration Action

Stage 1 Solid 0-30 Days Replace Batteries

as Soon as Possible.

Stage 2 Flashes Every 31-60 Days Replace Batteries

2 Seconds Immediately to

Provide Proper

Operation.

Stage 3 Flashes Every 61-90 Days Replace Batteries

1 Second Urgently to

Provide Proper

Operation.

The 3 Stage Low Battery Indicator is provided to inform the user when the

batteries require immediate attention. We recommend replacing the

batteries as soon as the low battery indicator appears. If the batteries are

not replaced after the low battery indicator ﬁrst appears, the thermostat

may not provide proper heating or cooling system operation.

Even if the low battery indicator does not appear, the batteries should be replaced

at least once a year, or if you plan on leaving the premises for over a month.

This dual power thermostat can be powered from 24 volts AC or battery power.

To determine if 24 volt AC power is connected to the thermostat, refer to the

installation and wiring diagram section. If you cannot determine how this

thermostat is powered, call a professional service technician to determine the

type of installation and the proper operation of your system.

Non-Volatile Memory

In the event of a power failure, the Non-Volatile Memory feature allows all settings

to be recovered, eliminating the need to reset temperature and differential settings.

When AC power is restored after an outage or batteries are reinserted, all settings

are retrieved from memory and reinstated.

Troubleshooting

Additional Operation Features

cont.

COOL

Battery Replacement

Status Indicators

HEAT: This will turn on whenever the system switch

is in the HEAT mode. “HEAT” will ﬂash when the

heating system is running.

COOL: This will turn on whenever the system switch

is in the cool mode. “COOL” will ﬂash when the

cooling systems is running.

AUX (Model BT21NP Only):This will turn on when the

auxiliary (second stage) of heating is active. The auxiliary

stage of heating is usually the least economical stage of

heat and typically runs when the ﬁrst stage of heat

cannot keep up with the temperature demand.

NOTE: AUX is also displayed when the system switch is in

the Emergency (EMER) Mode.

Replacing the Batteries

1. Open front cover and locate the battery compartment door.

Gently remove the two "AA" alkaline batteries located in the battery compartment.

3. Install two new "AA" alkaline batteries into battery compartment. Make sure to

match the positive (+) ends of the batteries with the positive (+) terminals

located in the battery compartment.

4. Close battery compartment. The low battery indicator should not appear

in the display.

Symptom: Thermostat does not turn on heating or cooling system.

Potential Solution: Check to see if OFF is shown in display. This indicates that the

system is turned off at the thermostat. Move system selector switch to HEAT or COOL

position. After the compressor short cycle protection 5-minute period expires, the

system should start.

Compressor protection feature may be in effect due to compressor short cycle

conditions. See Section 6.

Heating or cooling system may be malfunctioning. Call a professional service technician

immediately to verify system operation.

Symptom: Thermostat turns on heating instead of cooling, or cooling instead of heating.

Potential Solution: Check thermostat wiring to make sure the heating and cooling

stages are connected to the correct terminals on the wiring block. See Section 9.

Symptom: Thermostat turns heating or cooling system on too often or not often enough.

Potential Solution: Increase or decrease temperature differential settings as appropriate

to provide the desired performance level. See Section 4.

Symptom: Low battery indicator is blinking in thermostat display.

Potential Solution: Replace batteries immediately to maintain proper system operation.

See Section 7.

cont.

Symptom: OFF is shown in thermostat display and heating or

cooling system will not start.

Potential Solution: This indicates that the system is turned off

at the thermostat. The thermostat must be in HEAT or COOL

mode of operation to control the heating or cooling system.

Move the system selector switch to the HEAT or COOL position.

Symptom: Thermostat display is blank.

Potential Solution: It is possible that AC power is not present at the thermostat, and/or

the batteries are drained. Check fuse, circuit breaker and thermostat wiring as

appropriate to verify AC power is available. Replace batteries before reprogramming

thermostat. See Section 7. If AC power is present, call a professional service technician

to verify thermostat and system performance.

Symptom: HI is shown in the thermostat display.

Potential Solution: The temperature sensed by the thermostat

is higher than the 99˚ F (37˚ C) upper limit of the thermostat’s

display range. The display will return to normal after the sensed

temperature lowers within the 40˚ to 99˚ F (4˚ to 37˚ C) display

range. Turn on the cooling system or use other methods to lower

the temperature accordingly.

This condition could occur from the system being turned off during an exceptionally

warm period or upon installation when the thermostat has been stored for a long

period of time in a warm vehicle or location prior to being installed.

Symptom: NO AUX SET is shown in the thermostat display.

(model BT21NP only)

Potential Solution: The thermostat (model BT21NP)

only) is conﬁgured for a conventional system, and the system

switch is in the EM HEAT position. The unit will still function in

a conventional 2 stage HEAT mode, but the display will ﬂash

NO AUX SET. Move the system switch to the HEAT position.

Symptom: LO is shown in the thermostat display.

Potential Solution: The temperature sensed by the thermostat

is lower than the 40˚ F (4˚ C) lower limit of the thermostat’s

display range. The display will return to normal after the sensed

temperature rises within the 40˚ to 99˚ F (4˚ to 37˚ C) display

range. Turn on the heating system to raise the temperature as

needed for comfort within the room.

This condition could occur from the system being turned off during a cold weather

period or upon installation when the thermostat has been stored for a long period of

time in a cold vehicle or location prior to being installed. The thermostat should be

allowed to warm up prior to installation to allow proper heating control once installed.

Symptom: Cannot program a set point temperature higher than 90˚ F (32˚ C).

Potential Solution: This is above the normal thermostat temperature setting range of

45˚ to 90˚ F (7˚ to 32˚ C).

Symptom: Fan continues to run whether the system is on or off.

Potential Solution: Check that the fan control switch is in the AUTO position. This will

allow the fan to run only when the heating or cooling system is turned on and running.

Check thermostat wiring to make sure that the fan control wiring is connected to the

correct terminals on the wiring block. See Section 9.

Troubleshooting

Symptom: The room is too warm or too cold.

Potential Solution: See Section 5. Review current set point and change as necessary.

Symptom: HEAT or COOL is ﬂashing, but the system is not running.

Potential Solution: The thermostat is telling the heating or cooling system to run, but

the system is not responding. You may need to call your local heating and air

conditioning contractor.

Wiring Diagrams

Rc Rh G

Factory Installed

Jumper

MODEL BT11NP: Single Stage Conventional Systems (Single Transformer)

WYB O

Heat

Control

Fan

Control

Cool

Control

NOTES: 1. Transformer common not required for battery-only operation of

thermostat. 2. For heating or cooling only system, ignore opposite connection.

3. For 2-wire 24 Volt AC or 250 mV - 750 mV millivolt heating systems, ignore

cooling connection and fan control.

Transformer Common

(See NOTE 1)

NOTE: Transformer common not required for battery-only operation of thermostat.

Troubleshooting

24 VAC

Neutral

120 VAC

Hot

24 VAC

120 VAC

Neutral

Hot

Cooling

Heating

120 VAC

Neutral

Hot

24 VAC

Rc Rh B

Remove

Factory Installed

Jumper

MODEL BT11NP: Single Stage Conventional Systems (Dual Transformer)

O Y W G

Heat

Control

Cool

Control Fan

Control

Transformer Common

(See NOTE)

MODEL BT11NP: Single Stage Heat Pump System

Compressor

Control

cont.

Wiring Diagrams

Transformer Common

(See NOTE 1)

cont.

Wiring Diagrams

R O

Reversing Valve

(Active in Cooling

- See NOTE 3)

B Y1 G W2

Transformer Common

(See NOTE 1)

1st Stage

Compressor

Contact

Emergency

Heat Control

2nd Stage

Heat Control

Fan Control

24 VAC

See NOTE 2

MODEL BT21NP: Multi-Stage Heat Pump Systems

NOTES: 1. Transformer common not required for battery-only operation of

thermostat. 2. Jumper is required to use Auxiliary Heat for both Second Stage and

Emergency Heat on units without separate Emergency Heat and Auxiliary Heat terminals.

3. For units requiring reversing valve to be energized during heating, connect reversing

valve to B terminal. For units requiring reversing valve to be energized during cooling,

connect reversing valve to O terminal.

Reversing Valve

(Active in Heating

- See NOTE 3)

C E/W1

(See NOTE)

Transformer Common

R Y1 E/W1 W2GO B C

1st Stage

Compressor

Control

1st Stage

Heat Control

Fan

Control

2nd Stage

Heat Control

24 VAC

Neutral

120 VAC

Hot

MODEL BT21NP: Conventional Systems (Single Transformer)

NOTE: Transformer common not required for battery-only operation of thermostat.

10 11

Reversing

Valve (Active in

Cooling - See

NOTE 2)

O W C

24 VAC

Reversing

Valve (Active in

Heating - See

NOTE 2)

Y G

Rc Rh

Factory Installed

Jumper

Fan

Control

Neutral

120 VAC

Hot

Neutral

120 VAC

Hot

NOTES: 1. Transformer common not required for battery-only operation of

thermostat. 2. For units requiring reversing valve to be energized during heating,

connect reversing valve to B terminal. For units requiring reversing valve to be

energized during cooling, connect reversing valve to O terminal.

www.bestechparts.com

U.S. Patent 7,438,469 and other patents pending. Made in China

•

BTNP-100-002

This warranty gives you speciﬁc legal rights and you may also have other rights that vary from

state to state or province to province. Answers to any questions regarding our limited warranty

may be obtained by writing our corporate ofﬁces.

For warranty service, please visit your nearest Baker Distribution facility.

Call us toll-free: 866-268-5599 (U.S.) • 630-844-1968 (Outside the U.S.)

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. This limited warranty applies for the duration of the warranty period

from the original date of purchase by a professional service technician.

Baker Distributing agrees to repair or replace at its option any BesTech 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. This limited warranty does not include the cost of removal or

re-installation.

2 Year

Limited

Warranty

Non-Programmable Thermostats

Store this

Booklet for

Future

Reference

This manual suits for next models

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