LG PREMTB10U Installation & Operation Manual
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LG PREMTB10U Installation & Operation Manual

Lg programmable thermostat installation & operation
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See also: Operation & Installation Manual
Installation & Operation
LG Programmable Thermostat
• Please read this Installation & Operation manual completely before
installing the product.
• Installation work must be performed in accordance with the national
wiring standards and local code by authorized personnel only.
• Please retain this manual for future reference after reading it thor-
oughly.
Type : LG Programmable Thermostat
Models : PREMTB10U
P/NO : MFL62129209
www.lg.com

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Summary of Contents for LG PREMTB10U

  • Page 1 • Installation work must be performed in accordance with the national wiring standards and local code by authorized personnel only. • Please retain this manual for future reference after reading it thor- oughly. Type : LG Programmable Thermostat Models : PREMTB10U www.lg.com P/NO : MFL62129209...

  • Page 2: Ergy

    TIPS FOR SAVING ENERGY TIPS FOR SAVING ENERGY Here are some tips that will help you minimize the power consumption when you use the air conditioner. You can use your air conditioner more efficiently by referring to the instructions below: •...

  • Page 3: Important Safety Instructions

    IMPORTANT SAFETY INSTRUCTIONS IMPORTANT SAFETY INSTRUCTIONS READ ALL INSTRUCTIONS BEFORE USING THE APPLIANCE. Always comply with the following precautions to avoid dangerous situations and ensure peak performance of your product. WARNING It can result in serious injury or death when the directions are ignored. CAUTION It can result in minor injury or product damage when the directions are ignored.
  • Page 4 IMPORTANT SAFETY INSTRUCTIONS • Do not give shock using sharp and pointed objectsThere is risk of fire, electric shock, explosion, equipment malfunction or injury. • Do not touch or pull the lead wire with wet hands. There is risk of product breakdown or electric shock.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS Ventilation Product - lnterlocked Air TIPS FOR SAVING EN- conditioner and Ventilator ERGY Ventilation Product - lnterlocked oper- ation with general Ventilator IMPORTANT SAFETY IN- Ventilation Product Function Settings Ventilation Product - Ventilator single STRUCTIONS operation Ventilation Product Reservations Set-...

  • Page 6: Product View And Features

    PART DESCRIPTION PART DESCRIPTION Name and Function of Thermostat Operation indication screen Air flow button Set temperature button Cooling desired temperature Fan Speed button Function setting button Set back button Up, Down, Left, Right button Operation mode selection button On/Off button Wireless Thermostat receiver Heating desired temperature - Some product don’t receive the wireless...

  • Page 7: Icon Description

    PART DESCRIPTION Icon description Function Icon Description A A uto mode - Product is change operating mode cooling or heating automatically. Cooling mode - Product is running cooling mode. Operation Dehumidification Mode mode - Product is running dehumidifying mode. H H eating mode - Product is running heating mode.
  • Page 8 PART DESCRIPTION Function Icon Description Current temperature - Display current room temperature. Cooling set point temperature Tempera- - temperature set point for cooling operation. ture Heating set point temperature - temperature set point for heating oper- ation. Display current wind strength. POW : wind strength - power HIGH : wind strength - high Fan Speed...
  • Page 9 PART DESCRIPTION Function Icon Description Simple reservation in operation Sleep reservation in operation Schedule Reservation weekly reservation in operation Holiday reservation in operation Day of week SUN: Sunday / MON: Monday / TUE: Tuesday WED: Wednesday / THU: Thursday / FRI: Friday SAT: Saturday The number of weekly reservation event Schedule...
  • Page 10 PART DESCRIPTION Function Icon Description Grill state : up / : stop / : down Child lock setting step :Child lock set / : Child lock cancel Minimum difference value setting step between cooling / heating set points Function Current time setting step setting Schedule override timer setting step Default Set back cooling / heating temperature set points setting step...

  • Page 11: Operation Instruction

    OPERATION INSTRUCTION OPERATION INSTRUCTION Standard Operation - Cooling Mode Press button to turn on the indoor. Press button to select Cooling operation mode. Adjust the desired temperature by pressing buttons. When setting the desired temperature higher than room temperature, only ventilation wind is blow out instead of cooling wind.

  • Page 12: Standard Operation - Power Cooling

    OPERATION INSTRUCTION Standard Operation - Power Cooling Press button to turn on the indoor. Press button to select cooling operation mode. Press button continuously until ’Po’ displayed. W W hat is Power Cooling? • Desired temperature: Po (actually 64 °F (18 °C)) It makes room temperature •...

  • Page 13: Standard Operation - Heating Mode

    OPERATION INSTRUCTION Standard Operation - Heating Mode Press button to turn on the indoor. Press button to select Heating mode. Adjust the desired temperature by pressing buttons. When setting the desired temperature lower than room temperature, there is only ventilation wind. C Setting temperature range : Option 1.

  • Page 14: Standard Operation - Dehumidification Mode

    OPERATION INSTRUCTION Standard Operation - Dehumidification Mode Press button to turn on the indoor. Press button to select Dehumidification mode. The temperature setting can not be adjusted during operation in this mode. • In rainy season or high humidity climate, it is possible to operate simultaneously dehumidi- fier and cooling mode to remove humidity effectively.

  • Page 15: Standard Operation - Fan Mode

    OPERATION INSTRUCTION Standard Operation - Fan Mode Press button to turn on the indoor. Press button to select Fan Mode. • Ventilation drive does not release cool wind but general fan • Because it releases the wind that has no temperature difference from the room, it func- tions to circulate the inside air.

  • Page 16: Standard Operation - Auto Operation Mode

    OPERATION INSTRUCTION Standard Operation - Auto Operation Mode Press button to turn on the indoor. Press button to select Auto operation mode. Press the button to select Cooling set point, and Cooling set point can be controlled by pressing the button Press the button to select Heating set point, and Heating set point can be...

  • Page 17: Standard Operation - Timed Override

    OPERATION INSTRUCTION Standard Operation - Timed Override Timed override operation changes occupied / unoccupied schedule for override time temporarily. - It revert to last occupied schedule in unoccupied override. - It revert to last unoccupied schedule in occupied override. - You can set ‘Override time’ by ‘Function setting – Override set time’ Operate Timed override Press button for 3 seconds, you...

  • Page 18: Standard Operation - Set Back

    OPERATION INSTRUCTION Standard Operation - Set back Set back operation revert to last unoccupied schedule until Set back operation is canceled. • It change to ‘function setting - set back setting’ if Thermostat doesn’t have last unoccupied schedule . - Set back operation setting : Auto operation mode / Set back setting temperature: Function setting –...

  • Page 19: Standard Operation - Temperature Setting

    OPERATION INSTRUCTION Standard Operation – Temperature Setting You can simply adjust the desired temperature. • Press the buttons to adjust the desired temperature. In Auto mode, both setpoints will adjust simultaneously. To adjust cooling and heating setpoints individually when in Auto mode, first press the cool or heat setpoint selection button.

  • Page 20: Standard Operation - Airflow Setting

    OPERATION INSTRUCTION Standard Operation - Airflow Setting Fan speed : You can simply adjust desired fan speed. Please setup desired fan speed by fan speed button. • Every time you press fan speed, you can select the fan speed in order of ‘SLO →...

  • Page 21: Sub Function - Plasma Purification

    OPERATION INSTRUCTION Sub Function - Plasma Purification Only products with Plasma Purification function can use this. The method to setup cleaning air Repeat pressing button until icon flash. Operate or cancel Plasma Purification function by pressing button. After setting, press button to exit.

  • Page 22: Sub Function - Energy-Saving Cooling Operation

    OPERATION INSTRUCTION Sub Function - Energy-Saving Cooling Operation Energy-Saving Cooling Operation function is the function to improve user's comfortableness and power saving capacity by adjusting desired temperature while running air-cooling. When operating cooling, setting the power saving function is available. C Except for cooling operated by the auto mode.

  • Page 23: Sub Function - Automatic Drying

    OPERATION INSTRUCTION Sub Function - Automatic Drying It is the function that dries the inside of an indoor unit when the product is OFF, and allows for the Fan to operate for certain time in order to remove mold and moisture. This function is only available on some products.

  • Page 24: Sub Function - Electric Heater

    OPERATION INSTRUCTION Sub Function - Electric Heater It is a function to strengthen the heating ability by turning on the electric heater during the heat- ing operation. It can only be set during heating operation. Repeatedly pressing button until icon flash. Turn on/off electric heater by pressing button (the...

  • Page 25: Sub Function - Humidifier

    OPERATION INSTRUCTION Sub Function - Humidifier Only products with humidifying function can use this. Repeatedly pressing button until icon flash. Turn on/off humidifier by pressing button (The icon will be displayed in case of setting option and disappear in reverse case .) Press button to exit.

  • Page 26: Sub Function - Fan Auto

    OPERATION INSTRUCTION Sub Function - Fan Auto It is the function that operate fan when outdoor unit is running. Only products with fan auto function can use this. The method to setup Fan auto function Repeat pressing button until icon flash. Operate or cancel Fan Auto function by pressing button.

  • Page 27: Function Setting - Vane Angle Control

    OPERATION INSTRUCTION Function Setting - Vane Angle Control This function is to adjust airflow angle. Repeat pressing button until icon flash. Press button to select active vane : 1 / 2 / 3 / 4 / All / Standard Select Vane number using buttons.

  • Page 28: Function Setting - Elevation Grill

    OPERATION INSTRUCTION Function Setting - Elevation Grill This function is to move the indoor filter up/down for cleaning filter. Press button Repeat pressing button until icon flash. Move to descent using button and press button will display descent icon and the up/down grill will descend.

  • Page 29: Function Setting - Child Lock

    OPERATION INSTRUCTION Function Setting - Child Lock It is the function to use preventing children or others from careless using. Press button repeatedly until is flashing. If moving to ’setup’ icon area by using button, ’setup’ icon blinks, and child lock function is setup if pressing button at that time.

  • Page 30: Function Setting - Minimum Difference Between Heating And Cooling Set Points

    OPERATION INSTRUCTION Function Setting - Minimum Difference between heating and cooling Set points It is function to setup minimum difference between heating and cooling set points. Repeat pressing button until icon flash. Press button to change. ❈ minimum difference value : 0~10°F(0~5°C) Press button to complete...

  • Page 31: Function Setting - Changing Current Time

    OPERATION INSTRUCTION Function setting - Changing Current Time Please press function setup button. If pressing function setup button repeatedly, it moves to time setup menu. ‘Time setup’ icon is indicated at that time and date blinks at current time indication area.
  • Page 32 OPERATION INSTRUCTION Press button to move to ’Minute’ setting mode. (the ’Minute’ segment will flash) Setting Minute value by pressing button. Press button to finish. In the process, press button to release and exit from setting mode. (In case of exit with incomplete information, it will return to the previous setting) ❈...

  • Page 33: Function Setting - Override Set Time

    OPERATION INSTRUCTION Function Setting - Override set time It is the function to set schedule override operation time. button to select Override time setting. If you press button repeatedly, you will be able to select Override time setting with icon, icon will be blinking.

  • Page 34: Function Setting - Set Back Temperature

    OPERATION INSTRUCTION Function Setting - Set back temperature It is the function to set default temperature setting points for set back operation. It used when controller doesn’t have last unoccupied schedule. button to select Set back temperature setting. Press button repeatedly to select Set back temperature ( ).

  • Page 35: Function Setting - Filter Sign Clear

    OPERATION INSTRUCTION Function Setting - Filter Sign Clear This function is to clear the indicator of indoor filter cleaning. Press button repeatedly until the is flashing. When the is flashing, press to clear this display. • When filter is covered by dust, it will reduce cooling/heating efficiency and consume more electric power.

  • Page 36: Programming - Simple Reservation

    OPERATION INSTRUCTION Programming - Simple Reservation You can set the reservation conveniently in the units of 1 hour from 1 hour to 7 hours. Press button on the Thermostat. (the ‘SIMPLE’ segment will blink) Press button to adjust reservation time. Press button to finish setting.

  • Page 37: Programming - Sleep Reservation

    OPERATION INSTRUCTION Programming - Sleep Reservation Sleep reservation is the function of air-conditioner to run and stop after certain period of time at sleep mode before sleep. When connected to a ventilation product and set the sleep reservation, when it goes to the sleep mode, after the set time has elapsed. •...

  • Page 38: Programming - Weekly Reservation

    OPERATION INSTRUCTION Programming - Weekly Reservation You can set individual daily schedules for the week. - For correct operation of Weekly Reservation, please set current time correctly. Press button repeatedly to enter ‘WEEK’ setting mode. ‘WEEK’ will blink. Select desired day by pressing the button.
  • Page 39 OPERATION INSTRUCTION Enter AM/PM setting mode by pressing button. AM or PM icon in window will blink. Select the AM/PM by pressing the button. Enter ‘hour’ setting mode by pressing button. The hour icon in window will blink. Select desired hour by pressing the button.
  • Page 40 OPERATION INSTRUCTION Enter ‘minute’ setting mode by pressing button. The minute icon in window will blink. Select desired minute by pressing the button. Enter ON/OFF setting mode by pressing the button. ON or OFF icon in window will blink. Select ON/OFF condition of timer by pressing the button.
  • Page 41 OPERATION INSTRUCTION Enter OCCUPIED/UNOCCUPIED setting mode by pressing the button. OCCUPIED or UNOCCUPIED icon in window will blink. Select OCCUPIED/UNOCCUPIED condition of timer by pressing the button. Enter operation mode setting mode by pressing the button. Operation mode icon in window will blink. Select desired operation mode by pressing the button.
  • Page 42 OPERATION INSTRUCTION Enter Cooling set point setting mode by pressing the button and the button. Cooling set point icon in window will blink. Select desired cooling set point by pressing the button. Enter Heating set point setting mode by pressing the button.
  • Page 43 OPERATION INSTRUCTION Enter fan speed setting mode by pressing the button. Fan speed icon in window will blink. Select desired fan speed by pressing button. If finishing weekly reservation setup, please press the button. Weekly reservation setup for the day that you set is finished.
  • Page 44 OPERATION INSTRUCTION • You can’t change operate mode, fan speed, setting temperature in unoccupied. - Display ‘Unoccupied Lock’ on the window.

  • Page 45: Programming - Weekly Reservation Schedule Copy/Paste

    OPERATION INSTRUCTION Programming - Weekly Reservation Schedule Copy/Paste You can copy weekly timer schedule data to another day. Press button repeatedly to enter ‘WEEK’ setting mode. ‘WEEK’ will blink. Select desired day by pressing the button. The day icon in window will blink. Press button for 3 seconds to copy schedule of selected day.

  • Page 46: Programming - Holiday Reservation

    OPERATION INSTRUCTION Programming - Holiday Reservation It automatically stops at reserved day that you set. Please move to ’holiday’ by repeatedly pressing button. Please move to ’date’ that you want to setup holiday by using button. Please appoint holiday by using button.

  • Page 47: Programming - Delete All Reservation

    OPERATION INSTRUCTION Programming - Delete All Reservation You can delete all reservation schedules. - Simple, sleep, weekly, holiday reservation Press button and button simultaneously and hold for 3seconds to delete all reservation schedules.

  • Page 48: Different Mode Drive

    OPERATION INSTRUCTION Different mode drive Different mode drive is a phenomenon taking place when indoor units' drive mode is different in the case that a few indoor units are set up on a heat pump system. (Different mode drive doesn't show up at cooling exclusive model.) While a few indoor units are running cooling on a heat pump system, it doesn’t operate heating drive if any...

  • Page 49: Ventilation Product - Lnterlocked Air Conditioner And Ventilator

    OPERATION INSTRUCTION Ventilation Product - lnterlocked Air conditioner and Ventilator Control using Thermostat where air conditioner indoor unit and the ventilation product is in- stalled at the same time. - When the power is turned on, your Thermostat recognizes the product (takes about 30 sec- onds) and then works normally.

  • Page 50: Ventilation Product - Lnterlocked Oper- Ation With General Ventilator

    OPERATION INSTRUCTION Ventilation Product - lnterlocked operation with general Ventila- It is used when air conditioner is interlocked with ventilation product. It is a function that cools and refreshes indoor air using the ventilation product at the same time operating the air conditioning function. Ventilation interlinked operation Press button on the...

  • Page 51: Ventilation Product Function Settings

    OPERATION INSTRUCTION Ventilation Product - Ventilator single operation Press button on the Thermostat. Pressing button will change the ventilation mode. Ventilation Thermostat Contents mode Display Heat Circulate indoor air without exchange loss of heat Directly circulate indoor air without going through heat Normal exchanger Circulate indoor air with...

  • Page 52: Ventilation Product Reservations Settings

    OPERATION INSTRUCTION Ventilation Product Reservations Settings Sleep Reservations : Sets to operate ventilation lightly during the sleep. Press button to enter the Programming mode. Ex) Setting Sleep Reservation time as ’3’. Repeat pressing button to enter the SLEEP reservation setting mode. segment flashing) Press button to adjust reservation time.

  • Page 53: Troubleshooting Mode Self Diagnosisr

    OPERATION INSTRUCTION Troubleshooting Mode Self Diagnosis If there are problems with the product, it self-diagnoses with Troubleshooting mode. It displays a number for the Troubleshooting mode with its inspection code phrase. When an error occurs while operating, the ‘CH’ phrase and Error code umber are displayed on the screen alternately as below.

  • Page 54: Checkups Before Reporting Breakdown

    OPERATION INSTRUCTION Checkups before reporting breakdown Please first check the items below for troubleshooting before consulting a service center. Symptoms Check-up Management • Please check up circuit breaker. • Is air-conditioner's power on? • Please check up Thermostat wire setup condition.

  • Page 55: Installation Method

    INSTALLATION METHOD INSTALLATION METHOD Please fix tightly using provided screws after placing Thermostat backplate on the placewhere you like to setup. - Please set it up not to bend because poor setup could take place if backplate bends.Please set up Thermostat board fit to the electrical box if there is a electrical box. - Install the product so as not to make a gap with the wall side and to prevent shaking afterthe installation.
  • Page 56 : AWG#22 CAUTION • Specification of LG supplied extension cable : AWG#22, 3 core shielded. (Model : PZCWRC1) • Apply enclosed noncombustible conduit(metal raceway) totally or use FT-6 rated cable or above level in case of local electric & building code that requires plenum(CMP) cable usage.
  • Page 57 INSTALLATION METHOD ③ Make sure each wire is securely fastened under each screw terminal and the wires are not in contact with each other. ④ Please connect the Terminal blocks of indoor unit’s C/BOX and wired remote controller by referring to the images and contents shown below. Connect the yellow(signal) part of the Thermostat’s terminal block and the ‘YL’...

  • Page 58: Thermostat Installation

    INSTALLATION METHOD Thermostat installation Since the room temperature sensor is in the Thermostat, the Thermostat box should be installed in a place away from direct sunlight, high humidity and direct supply of cold air to maintain proper space temperature. Install the Thermostat about 5ft(1.5m) above the floor in an area with good air circulation at an average temperature.

  • Page 59: Group Control

    GROUP CONTROL GROUP CONTROL When installing more than 2 units of air conditioner to one Thermostat, please connect as the right figure. - Set one indoor unit to master and the re- Signal wire maining to slave. Signal wire When controlling multiple indoor units with one Thermostat, you must change the master/slave setting from the indoor unit.

  • Page 60: Installation Instruction

    INSTALLATION INSTRUCTION INSTALLATION INSTRUCTION Installer Setting - How to enter installer setting mode If pressing button long for 3 seconds, it enters into Thermostat installer setup mode. - If pressing once shortly, it enters into user setup mode. Please press more than 3 seconds for sure.
  • Page 61 INSTALLATION INSTRUCTION <Installer Setting Code Table> 1) General air-conditioner product Code Function Value Test Run 01:Set Address Setting 00~FF : Address <ESP Step> <ESP Value> <Example> 01:VeryLow 0 ~ 255 02:Low E.S.P. Value 03:Med 04:High Function Code ESP step ESP value 05:Very High 01:Remo Thermistor...
  • Page 62 INSTALLATION INSTRUCTION 2) General Ventilation product Code Function Value Test Run 01 : Test Run Setup Address Setting 00~FF : Address of Central Control SA(Supply Air) ESP <ESP Step> <ESP Value> <Example> 01:Low 0 ~ 255 02:High EA(Exhaust Air) ESP 03:Very High Function Code ESP step...

  • Page 63: Installer Setting - Test Run Mode

    INSTALLATION INSTRUCTION Installer Setting - Test Run Mode After installing the product, you must run a Test Run mode. For details related to this operation, refer to the product manual. If pressing button long for 3 seconds, it enters into Thermostat installer setup mode.

  • Page 64: Installer Setting - Setting Address Of Central Control

    INSTALLATION INSTRUCTION Installer Setting - Setting Address of Central Control It's the function to use for connecting central control. Please refer to central controller manual for the details If pressing button long for 3 seconds, it enters into Thermostat installer setter setup mode. - If pressing once shortly, it enters into user setup mode.

  • Page 65: Installer Setting - E.s.p. Function

    INSTALLATION INSTRUCTION Installer Setting - E.S.P. Function This is the function that decides the strength of the wind for each wind level and because this function is to make the installation easier. • If you set ESP incorrectly, the air conditioner may malfunction. •...
  • Page 66 INSTALLATION INSTRUCTION Select ESP fan step again by using button and setup ESP value, as No. 4 and 5, that corresponds each fan speed. Press button to save. Press button to exit. ❈ After setup, it automatically gets out of setup mode if there is no button input for 25 seconds.

  • Page 67: Installer Setting - Thermistor

    INSTALLATION INSTRUCTION Installer Setting - Thermistor This is the function to select the temperature sensor to judge the room temperature. If pressing button long for 3 seconds, it enters into Thermostat installer setup mode. - If pressing once shortly, it enters into user setup mode.

  • Page 68: Installer Setting - Ceiling Height Selection

    INSTALLATION INSTRUCTION Installer Setting - Ceiling Height Selection This function is to adjust FAN Airflow rate according to ceiling height (For ceiling type product) If pressing button long for 3 seconds, it enters into Thermostat installer setup mode. - If pressing once shortly, it enters into user setup mode.

  • Page 69: Installer Setting - Static Pressure Setting

    INSTALLATION INSTRUCTION Installer Setting - Static Pressure Setting This function is applied to only duct type. Setting this in other cases will cause malfunction. Press button for 4 seconds to enter the installer setting mode until timer segment displays “01:01”. If pressing button repeatedly, it moves to static pressure selection menu...

  • Page 70: Installer Setting - Override Master/Slave Setting

    INSTALLATION INSTRUCTION Installer Setting - Override Master/Slave Setting Since Multi V II, override master/slave function is to prevent product's different mode operation. If it setup as the slave, It blocks to change opposite run mode to outdoor unit cycle (cooling/heat- ing) If pressing button long for 3...

  • Page 71: Installer Setting - Dry Contact Mode Setting

    INSTALLATION INSTRUCTION Installer Setting - Dry Contact Mode Setting Dry contact function is the function that is possible to use only when dry contact equipment is separately purchased/setup. If pressing button long for 3 seconds, it enters into Thermostat installer setup mode. - If pressing once shortly, it enters into user setup mode.

  • Page 72: Installer Setting - Fahrenheit / Celsius Switching

    INSTALLATION INSTRUCTION Installer Setting - Fahrenheit / Celsius Switching This function is used for switching the display between Celsius and Fahrenheit. If pressing button long for 3 seconds, it enters into Thermostat installer setup mode. - If pressing once shortly, it enters into user setup mode.

  • Page 73: Installer Setting - Emergency Heater Setting

    INSTALLATION INSTRUCTION Installer Setting - Emergency Heater Setting This function is only available on some products. This function will set the Emergency Heater Setting. Emergency Heater is used to heat the space in emergency case such as heat pump error. Emergency heat is in place of and does not supplement heat pump.
  • Page 74 INSTALLATION INSTRUCTION Move to Low Outdoor Ambient Heating Operation setting by pressing button. Press button to setup Low Outdoor Ambient Heating Operation. 0 : not use 1 : use - compressor off(0℉/ -18℃) / compressor on(5℉ / -15℃) 2 : use - compressor off(5℉ / -15℃) / compressor on(10℉ / -12℃) 3 : use - compressor off(10℉/ -12℃) / compressor on(15℉...

  • Page 75: Installer Setting - Option Function Setting

    INSTALLATION INSTRUCTION Installer Setting - Option Function Setting Setting feature for indoor unit when plasma purification / electric heater / humidifier / elevation grill / ventilation kit / auxiliary heater is newly installed, or installed unit is removed. If pressing button long for 3 seconds, it enters into Thermostat installer setup mode.

  • Page 76: Installer Setting - Setting Temperature Range

    INSTALLATION INSTRUCTION Installer Setting - Setting temperature range This function is used for select setting temperature range option. If pressing button long for 3 seconds, it enters into Thermostat installer setup mode. - If pressing once shortly, it enters into user setup mode. Please press more than 3 seconds for sure.

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