Dwyer TLVT1 User Manual

Model TLVT1

Digital Touchscreen Programmable
Thermostat with Heat Pump 120515

CAUTION:

1. Turn off any electrical devices (e.g. heater,
cooler) that are connected to the unit before
installation and maintenance.

2. The installer must be a trained service engineer.

3. Disconnect the supply before battery replacement.

4. Do not dispose the used up battery with the
household waste. Please refer to your local area
for proper disposal.

5. It must be mounted on a dry clean indoor place.

Feature List

 Thermostat / Heat-pump Selection (software selectable)
 Fan On / Auto
 Battery Powered (2 “AA” alkaline batteries)
 7-day (Monday to Sunday), 4-timezone section and

temperature program settings

 Temperature display in

o

F or oC

 Temperature Measurable Range : 32 ~ 99

o

F / 0 ~ 40oC

 Program Copy for fast programming
 EEPROM stores heat and cool program settings
 Program Override Mode (Temporary / Permanent)
 Real clock in 12 hr / 24 hr
 Filter, energy and UV lamp usage record
 Adjustable interval time for filter, energy and UV usage
 Energy Saving Index
 Defrost function
 Cleaning Screen mode
 Calendar
 Holiday Mode
 Security Mode

Wiring

 When two-transformer system is used, connect the wires to

R

H

and RC accordingly to the diagram shown.
When single-transformer system is used, connect RH and RC
together.

 There are two wiring configurations: thermostat or

heat-pump.
Please select the configuration to be used and then connect
the appliances accordingly.

Thermostat

Terminals

Device

RH

24Vac supply for heater

RC 24Vac supply for cooler

W 1st stage heating

W2

2nd stage heating

Y 1st stage cooling

Y2

2nd stage cooling

G

Fan

Heat-pump

Terminals

Device

RH

24Vac supply

RC

E

Emergency Heat

W2

Auxiliary Heat

Y 1st stage compressor

Y2

2nd stage compressor

G

Fan

B

Changeover valve for heat

O

Changeover valve for cool

Pull all cables back into wall prior to avoid trapping wires.
Do not use metal conduit or of cable provided with a metal sheath.
Recommend adding fuse or protective device in the live circuit.

Mounting

1. Base housing
I. Adjust the base on the wall or junction box and ensure

the base is at surface level and cover the junction box
comfortably.

II. If necessary, pull the cables out at the middle hole of the

base.

III. If necessary, place the 2 pcs of wall anchors at the wall.
IV. Fasten the base with the 2 pcs of long screws.
V. Place the cables at the hole near the terminal block.

2. Insert 2 AA batteries into the battery case on the thermostat
(Please observe polarity).

3. Hold the thermostat on the base. Align the screw blocks with
the pins on the back of the thermostat.

4. Push the thermostat straight onto the base until snaps into
place.

Setup Mode

There are 10 settings in the setup mode:

1. Calendar

2. 12 / 24 hour selection

3. oC / oF display selection

4. HE / HG selection

5. Thermostat / Heat-pump selection

6. Control system selection

7. Span and Differential selection

8. Delay / Long Delay selection

9. DST (Daylight Saving Time) Selection

10. Screen lock selection

To enter setup mode, press and hold SYSTEM for 5 seconds.
In setup mode, press EXIT to discard changes made to current
setting and exit setup mode. Press CONFM to apply changes and
proceed to next setting.

Set Calendar

Press / to change year, month and day accordingly.
Press CONFM to apply changes and proceed to next setting.

12/24 hour

Press / to toggle between 12 and 24 hour mode.
Press CONFM to apply changes and proceed to next setting.

o

C / oF Selection

Press / to toggle between oC or oF temperatuire unit.
Press CONFM to apply changes and proceed to next setting.

HE / HG Selection

Press / toggle between HE / HG selection.
Press CONFM to apply changes and proceed to next setting.
When fan is in auto mode and HE is selected, fan will be turned on
as long as heater / cooler is turned on.
When fan is in auto mode and HG is selected, fan will only be
turned on during cool mode.

HE

HG

Heat On

Fan On

Fan Off

Cool On

Fan On

Fan On

* Heat-pump discard HE/HG selection except for emergency heat

Thermostat / Heat-pump

Press / to toggle between thermostat and heat-pump
selection.

“th” represents thermostat.
“HP represents heat-pump.

Press CONFM to apply changes and proceed to next setting.

Control System Selection

Press / to toggle between control system selection.
Press CONFM to apply changes and proceed to next setting.

Selectable configurations are shown as follow :

Thermostat

Configuration

Display

Terminal Conection

1 heat 1 cool

1H1C

RH, RC, W, Y

1 heat 2 cool

1H2C

RH, RC, W, Y, Y

2

2 heat 1 cool

2H1C

RH, RC, W, W2, Y

2 heat 2 cool

2H2C

RH, RC, W, W2, Y, Y

2

* Connect fan ( terminal : G ) if necessary.

Heat-pump

Configuration

Display

Terminal Conection

1 heat 1 cool

1H1C

RH, RC, Y,, B, O

2 heat 2 cool

2H2C

RH, RC, Y, Y2, B, O

2 heat 2 cool

Axuliary heat

3H2C

RH, RC, W2, Y, Y

2

* Connect fan ( terminal : G ) if necessary.
* Emergency Heat ( terminal : E ) is used for defrost control.
Connect it if necessary.

Span and differential Selection

“P” represents span setting.
“d” represents differential setting.
Span and differential setting units will be changed according to the
temperature unit selected by user.
The selectable values are 0.5°C(1°F) / 1.0°C(2°F) / 1.5°C(3°F).
The default span and differential settings are 0.5oC / 1oF.
Press / to change the values. Press CONFM to apply
changes and proceed to next setting.

Delay / Long Delay Selection

Press / to toggle between delay and long delay selection.
Press CONFM to apply changes and proceed to next setting.
Delay for heat / cool on to prevent short cycling of system that
may damage the appliance.
“dE” represents delay. “L dE” represents long delay.

Delay

Long delay

Heat mode

5~10 sec

4~5 min

Cool mode

4~5 min

4~5 min

For Heat-pump configuration, it will always be a long delay
irrespecting to this selection setting.

DST (Daylight Saving Time)

Press / to toggle on/off of the DST function.

* The DST used is based on USA time-zone.

Secure Lock Selection

Press or to enable(ON) or disable(OFF) the security

lock. If it is enabled, user is required to input a 4-digits password.

Press or on the left to change the password. P1 indicates

that the 1st digit password (read from left) is selected. Press or

on the right to select the digit.

After setting all 4 digits, press CONFM to activate the security

mode.

When security mode is activated, “ ” is shown on the LCD and

all keys are disabled expect SYSTEM .

* If the password is 8888, all settings will restore to default upon

pressing CONFM .

Disable the security lock

1. Press SYSTEM and user is required to enter the correct
password.

2. If the password is correct, the security lock will be disabled.
Otherwise, it remains locked.

* Security Lock cannot be maintained once power is lost.

View Calendar

1. Press the current weekday to view current date.

2. Press EXIT to exit the viewing.

Clock Setting

1. Press CLOCK to enter the clock setting mode.

2. Firstly, the hour is shown. Press or to change the

hour. Press CONFM to save the setting.

3. Then, the minute is shown. Press or to change the

minute. Press CONFM to save the setting and exit clock
setting.

Clean Screen Mode

1. Press CLEAR to enter the cleaning screen mode.

2. The screen will show a 20-second countdown immediately after

the key press.

3. During countdown, all keys are disabled.

4. When countdown reaches zero, press EXIT to exit clean

screen mode, or press CLEAR to repeat the countdown.

Usage

TLVT1 can record the Filter, UV and energy usage. These
counters count hourly. Each count is 4 digits long (0~9999). Filter
usage counts when the fan is turned on; UV usage counts as long
as TLVT1 is powered on. Energy usage counts when heater /
cooler is turned on. When the counts reach the set limit, the
corresponding usage icon will be shown on the screen.

View Usage

1. Press USAGE to enter the usage mode.

2. Filter, UV and Energy counter are shown alternatively by

pressing USAGE .

3. Press CLEAR to clear the current counter records.

4. Press EXIT to exit the usage mode.

Adjusting Usage limit

1. Press and hold USAGE for 3 seconds during the usage mode.

2. Press or to change the internal time (0~9999).

3. Press CONFM to save the setting.

4. Press EXIT to exit the limit setting.

Defrost

When the room temperature is below 5 oC / 41 oF, HEATER will
always be turned ON and COOLER will be turned OFF
irrespective of the current control temperature set. 2nd stage heater,
emergency and auxiliary heater may be turned on depending on

the control system configuration. “ ”Defrost indicator will be
shown on screen.

Program mode

Default programs are as the below:

Heat settings :

Wake

Out

Back

Sleep

Mon

6:00

(21 oC/70 oF)

8:00

(16 oC /61 oF)

18:00

(21 oC /70 oF)

22:00

(16 oC /61 oF)

Tue

6:00

(21 oC /70 oF)

8:00

(16 oC /61 oF)

18:00

(21 oC /70 oF)

22:00

(16 oC /61 oF)

Wed

6:00

(21 oC /70 oF)

8:00

(16 oC /61 oF)

18:00

(21 oC /70 oF)

22:00

(16 oC /61 oF)

Thu

6:00

(21 oC /70 oF)

8:00

(16 oC /61 oF)

18:00

(21 oC /70 oF)

22:00

(16 oC /61 oF)

Fri

6:00

(21 oC /70 oF)

8:00

(16 oC /61 oF)

18:00

(21 oC /70 oF)

22:00

(16 oC /61 oF)

Sat

6:00

(21 oC /70 oF)

10:00

(16 oC /61 oF)

18:00

(21 oC /70 oF)

23:00

(16 oC /61 oF)

Sun

6:00

(21 oC /70 oF)

10:00

(16 oC /61 oF)

18:00

(21 oC /70 oF)

23:00

(16 oC /61 oF)

Cool setting:

Wake

Out

Back

Sleep

Mon

6:00

(26 oC /79 oF)

8:00

(29.5 oC /85 oF)

18:00

(26 oC /79 oF)

22:00

(28 oC /82 oF)

Tue

6:00

(26 oC /79 oF)

8:00

(29.5 oC /85 oF)

18:00

(26 oC /79 oF)

22:00

(28 oC /82 oF)

Wed

6:00

(26 oC /79 oF)

8:00

(29.5 oC /85 oF)

18:00

(26 oC /79 oF)

22:00

(28 oC /82 oF)

Thu

6:00

(26 oC /79 oF)

8:00

(29.5 oC /85 oF)

18:00

(26 oC /79 oF)

22:00

(28 oC /82 oF)

Fri

6:00

(26 oC /79 oF)

8:00

(29.5 oC /85 oF)

18:00

(26 oC /79 oF)

22:00

(28 oC /82 oF)

Sat

6:00

(26 oC /79 oF)

10:00

(29.5 oC /85 oF)

18:00

(26 oC /79 oF)

23:00

(28 oC /82 oF)

Sun

6:00

(26 oC /79 oF)

10:00

(29.5 oC /85 oF)

18:00

(26 oC /79 oF)

23:00

(28 oC /82 oF)

1. Press PROG to enter the program mode.

2. Default start from “MON” and “WAKE”.

3. Current program of setting is without .

4. Press / to change the time, heat and cool setting
temperature.

5. Press EXIT to go back to normal mode.

6. Press CONFM to save setting and go back to normal mode.

7. Press COPY to copy the program.

8. During copying, the heat and cool setting temperatures are
not set but still can be checked by pressing WAKE, OUT ,
BACK and SLEEP.

9. Press the other days to copy the program. The days that are
copied will also be without .

10. Press “COPY” again to finish the copy mode and return to
program setting mode.

Override mode

1. Press to select permanent override, temporary

override and program.

2. Default heat and cool setting temperature for override and

permanent override mode is 26 oC / 79 oF.

3. Press / to change the override setting temperature in

heat and cool mode respectively.
Temporary override mode returns to normal mode when new
program starts if override time does not set.

Holiday Mode

1. Select system to temporary override.

2. Press and hold OVERRIDE for about 3 seconds to enter

holiday mode setting.

3. User may set the time interval for the holiday mode

duration. Value on the left refers to number of hours and that
on the right refers to number of days.

4. Press / to adjust the values.

5. Press CONFM to apply changes, or EXIT to discard

changes.

6. When holiday mode is activated, OVERRIDE flashes.

7. The thermostat will keep using the current setting

temperature until the holiday time duration reaches zero. It
then returns to program mode.

8. To disable holiday mode, any one of the three methods can

be done.

i. Change system to permanent override mode.

ii. Change system to normal mode.

iii. Set the holiday time interval to zero.

System setting

In Normal mode, press and release SYSTEM to enter system

mode.

User may set the system used by pressing SYSTEM.

It follows the sequence below:

(HEAT EM)  HEAT COOL AUTO OFF HEAT

HEAT
EM

It is the same as HEAT mode, except that it would turn
on emergency heat instead of compressor ( Heat-pump

MODE

only ).

HEAT
MODE

Heating appliances will be activated when the room
temperature is lower than the setting temperature.

COOL
MODE

Cooling appliances will be activated when the room
temperature is higher than the setting temperature.

AUTO
MODE

The unit will use the current heat and cool setting
temperature to turn on heating or cooling appliances.

OFF
MODE

No heating and Cooling will be activated at any
temperature.

“LO” will be shown on the screen when room temperature is
below 0 oC / 32 oF.
“HI” will be shown on the screen when room temperature is above
40 oC / 99 oF.

When one appliance is turned on, will be shown on the
screen as indication.

Similarly, will be shown on the screen when second
appliance is turned on.

Emergency Heat

When it is activated, “EM.” will be shown on the screen.

Auxiliary Heat

When it is activated, “AUX” will be shown on the screen.

FAN mode

Press FAN to enter fan mode. In the fan mode, press FAN to

toggle the Fan controls (FAN ON or FAN AUTO).

FAN ON: Fan stays on all the time.
FAN AUTO: Fan turns ON whenever heating or Cooling is on

(Depends on HE/HG setting).

Energy saving index

The energy saving index is calculated based on the setting
of your program. It is used as a reference for the user to
know how likely the program is to conserve energy or
consume more.
If the user sets a comfort program setting, the appliances
are likely to be turned on a lot and “LOSE” may be shown
on the screen. If the appliances are less likely to be turned
on, “SAVE” may be shown on the screen.
The likelihood of saving energy or losing energy is
converted to a percentage value for reference.
If the value is higher than 99%, “HI” will be shown
instead.

Low battery

If the voltage batteries drop below 2.7V, icon will be on.

Electrical Interface

Temperature measurement: 0~40 oC / 32~99 oF
Control temperature range: 5~35 oC / 41~95 oF
Temperature resolution: 0.5 oC 1 oF
Temperature accuracy: ±0.5 oC / ±1 oF
Battery: 2 AA alkaline battery
Relay contact Voltage: 24Vac 50/60Hz
Relay contact Current: 1A Max