Smarttemp 44-850 Touchscreen Thermostat
INTRODUCTION
The 44-850 is a feature-rich touchscreen thermostat that can be battery-powered or hardwired to the HVAC equipment. Using a common sense approach to the installation will ensure this product is installed properly and to the customer’s satisfaction. Please take time to read and understand this manual so that installation and testing are performed in an efficient manner. This manual is to be used in conjunction with the supplied User Manual. Although great care has been taken in the preparation of this manual, Smart Temp takes no responsibility for errors or omissions contained herein. It is the responsibility of the installer to ensure that this thermostat and the equipment connected to it operate in a safe and efficient manner. Due to ongoing product improvements, Smart Temp reserves the right to change the specifications of the 44-850 thermostat or its components without notice.
All rights reserved.
© Smart Temp P/L 2015.
Intellectual rights apply.
GETTING STARTED
As with any HVAC project, careful installation is the key to a successful outcome. Time taken during the installation process will be rewarded with fewer callbacks. The steps required to install the 44-850 thermostat are as follows.
- Read and understand this Installation Manual and User Manual.
- Mount and wire the sub-base.
- Install the batteries.
- Set the 4 system switches to match the equipment application.
- Wire optional remote temperature sensor(s).
- Power the thermostat
- Set the Advanced Installer settings.
- Test the thermostat.
INSTALLING THE THERMOSTAT
DISASSEMBLY
There are two release slots located on the bottom of the thermostat. Gently push the flat blade of a small screwdriver into one slot at a time and pry upward until the catch disengages. Carefully swing the thermostat upward and away from the sub base. (Figure 1)
THERMOSTAT LOCATION
The 44-850 should be installed in a location that represents the ambient space temperature. Do not install the thermostat in an area where drafts are present, near the floor, behind doors or on an external wall. Avoid placing the thermostat in areas where the air movement is limited, affected by direct sunlight or other areas not represented by the typical temperature in the space.
MOUNTING THE SUB BASE
When mounting the 44-850 subbase, be aware that drafts may travel down wall cavities and enter the back of the thermostat through the control wire hole in the wall. It is important to seal the hole to prevent any drafts that might affect the internal temperature sensor.
INSTALLING THE THERMOSTAT
Pull the control wires through the large opening in the thermostat subbase. Next, level and mount the subbase on the wall using the supplied anchors and screws. (Figure 2) Do not over-tighten the mounting screws as the sub-base may warp causing the improper seating of the thermostat connecting pins to the terminal blocks. Use a properly sized screwdriver and back each screw terminal out (counterclockwise) before landing each wire to its dedicated terminal.
Do not over-tighten the terminal screws. Check to ensure that all wires are landed correctly and dressed properly to prevent any shorts. Refer to the Typical System Wiring Diagrams in this manual for proper wiring.
TERMINAL DESIGNATIONS
| TERMINAL | DESIGNATION |
| S2 | Outdoor Sensor |
| SC | Sensor Common |
| S1 | Indoor Sensor |
| AUX | Auxiliary Contacts |
| W2/OB | Second Stage Heat or Reversing Valve |
| Y1 | First Stage Cool or First Stage Compressor |
| Y2 | Second Stage Cool or Second Stage Compressor |
| W1 | First Stage Heat/Auxiliary/Emergency Heat |
| G | Fan |
| R | 24 VAC Hot |
| C | 24 VAC Common |
SETTING THE SYSTEM SWITCHES
The 44-850 contains a set of four system switches located on the thermostat printed circuit board. (Figure 3) The switches are used to match the thermostat
operation and relay outputs with the HVAC system requirements. Refer to the system switch functions on the next page to properly configure the thermostat.
SYSTEM SWITCH FUNCTIONS
- Switch 1 – Equipment Type OFF Gas heat with add-on cool (Default).
- ON For heat pump equipment.
- Switch 2 – Fan or When Switch 1 is OFF (Heat Cool Mode)
- Reversing Valve OFF Gas Heat – Heater controls fan (Default).
- ON Electric Heat -Thermostat calls fan with heat.
- When Switch 1 is ON (Heat Pump Mode)
- OFF Heat pump ‘O’ reversing valve in cool.
- ON Heat pump ‘B’ reversing valve in heat.
- Switch 3 – Equipment Stages OFF 1 heat / cool gas/electric or 2 heat/1 cool HP.
- ON 2 heat /2 cool gas/electric or 3 heat/2 cool HP
- Switch 4 – Fossil Fuel Mode OFF Conventional heat pump equipment (Default).
- ON Fossil fuel equipment, (Used in the USA mostly)
INSTALLING THE BATTERIES
The 44-850 comes with two AA Alkaline batteries. Even if the thermostat is hardwired, battery backup is recommended to maintain the real-time clock in the
event of a power failure. All other memory is non-volatile in the event of battery or primary power loss. Press in on the battery access compartment and slide the drawer out. Install the two AA Alkaline batteries matching the + and – orientation. Push the battery compartment in until it clicks shut. When the alkaline batteries are properly installed, the touchscreen display will light up. (Figure 4)
TYPICAL SYSTEM WIRING DIAGRAMS
HEAT ONLY (GAS)
Switch Settings
- Switch 1 = OFF Heat/Cool
- Switch 2 = OFF Equipment controls a fan on call for heat
- Switch 3 = OFF Single Stage
- Switch 4 = OFF Leave OFF
HEAT ONLY (ELECTRIC)
- Switch Settings
- Switch 1 = OFF Heat/Cool
- Switch 2 = ON Thermostat controls a fan on call for heat
- Switch 3 = OFF Single Stage
- Switch 4 = OFF Leave OFF
COOL ONLY (SINGLE OR MULI-STAGE)
Switch Settings
- Switch 1 = OFF Heat/Cool
- Switch 2 = OFF Fan energized on call for cooling
- Switch 3 = OFF/ON OFF = Single Stage ON = Multi-stage
- Switch 4 = OFF Leave OFF
1 HEAT/1 COOL (GAS)
Switch Settings
- Switch 1 = OFF Heat/Cool
- Switch 2 = OFF Fan energized on call for cooling
- Switch 3 = OFF Single Stage
- Switch 4 = OFF Leave OFF
2 HEAT/2 COOL (GAS)
Switch Settings
- Switch 1 = OFF Heat/Cool
- Switch 2 = OFF Fan energized on call for cooling
- Switch 3 = ON Multi-stage
- Switch 4 = OFF Leave OFF
2 HEAT/1 COOL (HEAT PUMP)
Switch Settings
- Switch 1 = ON Heat Pump
- Switch 2 = OFF/ON Reversing Valve OFF = ‘O’ Cool ON = ‘B’ Heat
- Switch 3 = OFF 2 Heat/1 Cool HP
- Switch 4 = OFF Leave OFF
3 HEAT/2 COOL (HEAT PUMP)
Switch Settings
- Switch 1 = ON Heat Pump
- Switch 2 = OFF/ON Reversing Valve OFF = ‘O’ Cool ON = ‘B’ Heat
- Switch 3 = ON 3 Heat/2 Cool HP
- Switch 4 = OFF Leave OFF
TYPICAL SYSTEM WIRING DIAGRAMS
2 HEAT/1 COOL (FOSSIL FUEL)
Switch Settings
- Switch 1 = ON Heat Pump
- Switch 2 = OFF/ON Reversing Valve OFF = ‘O’ Cool ON = ‘B’ Heat
- Switch 3 = OFF 2 Heat/1Cool fossil fuel
- Switch 4 = ON Locks out the heat pump when the furnace is energized
3 HEAT / 2 COOL (FOSSIL FUEL)
Switch Settings
- Switch 1 = ON Heat Pump
- Switch 2 = OFF/ON Reversing Valve OFF = ‘O’ Cool ON = ‘B’ Heat
- Switch 3 = ON 3 heat / 1 cool fossil fuel
- Switch 4 = ON Locks out the heat pump when the furnace is energized
ENTERING THE SETUP MENU
Tap the display to bring on the back light then touch and hold both the Clock and Mode section for 5 seconds to enter the Installer Menu.
- To advance through the menu, touch the Mode (Next) section.
- To go back in the menu, touch the Fan (Back) section.
- To exit the menu at any time and save changes, touch and hold the Next
- (Mode) section until the display shows normal operation
INSTALLER SETUP MENU
SELECTING THE PROGRAMMABLE OR NON-PROGRAMMABLE
OPERATION
The first menu 01 selects programmable or non-programmable operation. Press the UP or DOWN arrows to change the selection.
- E7 = 7-Day Programmable (Factory Default)
- 0 = Manual Mode (Non-programmable)
SELECTING NUMBER OF PROGRAM EVENTS
(ONLY DISPLAYED WHEN 01 = 7)
If menu 01 is set to 7, the thermostat can be configured for 4 or 2 schedules per day.
- 4 = 4 schedules per day (Factory Default)
- 2 = 2 schedules per day
SELECTING MODE
Menu 03 selects the mode of operation. The factory default is 0 for Autochangeover.
- 0 = Auto-changeover (Heat/Cool/Auto/Off for Heat/Cool)
- (Heat/Cool/Auto/EHeat/Off for Heat Pump (Factory Default)
- 1 = Manual Changeover (Heat/Cool/Off) or (Heat/Cool/E.Heat/Off)
- 2 = Heating Only (Heat/Off) or (Heat/E.Heat/Off)
- 3 = Cooling Only (Cool/Off)
ASSIGNING AUXILIARY CONTACTS
Menu 05 assigns the auxiliary dry relay contacts (AUX) as Normally Open or Normally closed when the Programmable Fan Option 04 is ON. Whenever Programmable Fan is in the Always On mode (constant ventilation) for a selected program period, the relay contact will go open or closed based on the auxiliary relay option selection. The auxiliary contacts can be used for controlling an economizer or other IAQ devices. The factory default is 1.
- 1 = Relay contacts closed when Programmable Fan is ON (Factory Default
- 2 = Relay contacts open when Programmable Fan is ON
SELECTING PROGRAMMABLE FAN
Menu 04 selects the Programmable Fan option which allows selecting continuous or auto fan operation for each program event when the programmable mode is selected. The factory default is 0.
- 0 = No Programmable Fan (Factory Default)
- 1 = Programmable Fan
- E Program
- Refer to the User Manual for selecting continuous or auto fan for each scheduled event when the Programmable Fan option is O
SELECTING TOUCHSCREEN LOCK OPTIONS
Menu 06 allows you to prevent changes to all or part of the touchscreen functions. The factory default is 0. Touch the UP or DOWN arrows to change the
selection.
- 0 = All functions unlocked (Factory Default)
- 1 = All functions locked except setpoint adjustment
- 2 = All functions locked
SELECTING THE COOLING SETPOINT LIMIT
Menu 07 selects the minimum cooling setpoint. The factory default is 10 (50f) . Touch the UP or DOWN arrows to adjust the limit from 6 – 50C (43° – 122°F.)
SELECTING THE HEATING SETPOINT LIMIT
Menu 08 selects the maximum heating setpoint limit. The factory default is 32C (90F). Touch the UP or DOWN arrows to adjust the limit from 5 – 49 C(41° –
120°F).
SELECTING BACKLIGHT OPTION
Menu 09 allows you to select the backlight option. The factory default is ON. Touch the UP or DOWN arrows to change the display option.
- 0 = Back Light on for 10 seconds when the screen is touched
- 1 = Back Light on high for 10 seconds when the screen is touched and then low continuously. (Thermostat must be hardwired to 24VAC for this option)
SELECTING THE ADAPTIVE RECOVERY OPTION
Menu 10 allows you to select the Adaptive Recovery option. Only displayed when menu option 01 is set to 7. Adaptive Recovery compares the space temperature deviation from the setpoint and rate of recovery history to bring the equipment on and reach the setpoint at the scheduled start time. The factory default is 0. Touch the UP or DOWN arrows to select this option.
- 0 = No Adaptive Recovery (Factory Default)
- 1 = Adaptive Recovery On (For programmable mode only)
SELECTING FIRST STAGE HEATING AND COOLING DIFFERENTIAL OPTION
Menu 11 is used to adjust the heating and cooling differential. The factory default is 1 0.5c ( 1°F). This represents the temperature above the cooling setpoint or
below the heating setpoint when the equipment is energized. Touch the UP or DOWN arrows to change the differential.
- 1 = 0.5c (1°F) Differential
- 2 = 1.0c (2°F) Differential
- 3 = 1.5c (3°F) Differential
SELECTING SECOND STAGE HEATING AND COOLING DIFFERENTIAL OPTION
Menu 12 is used to adjust the second-stage heating and cooling differential. The factory default is 1 0.5c ( 1°F). This represents the temperature above the first-stage cooling differential or below the first-stage heating differential when the second stage is energized. There is a 3-minute time delay before the second stage is energized. Touch the UP or DOWN arrows to change the differential.
SELECTING THIRD STAGE HEATING DIFFERENTIAL OPTION
Menu 13 is used to adjust the third-stage heating differential. Only displayed when SW 3 is ON. The factory default is 1 0.5°C( 1°F). This represents the
temperature below the second-stage heating differential when third-stage heat is energized. There is a 3-minute time delay before third stage heat is energized.
Touch the UP or DOWN arrows to change the differential.
SELECTING DEMAND STAGING OR LOCKED STAGING OPTION
Menu 14 is used to select how the thermostat will stage the equipment. The factory default is 0 which = Demand Staging. Demand Staging allows the
thermostat to upstage or downstage the equipment based on the stae differential settings. 1 = Locked Staging. Locked Staging allows the thermostat
to upstage the equipment based on the stage differential settings but locks in each stage until the setpoint is reached. (No down-staging)
- 0 = Demand Staging (Factory Default)
- 1 = Locked Staging
SENSOR CALIBRATION
Menu 15 allows you to re-calibrate the internal or a single indoor remote sensor. When a remote sensor is wired to the SC and S1 terminals, the internal sensor is automatically disabled. The factory default is 0 . Touch the UP or DOWN arrows to adjust the calibration from -5° to +5°c/f .
SELECTING LOW BALANCE POINT OPTION
Menu 16 allows you to select a low balance point setting when the thermostat is configured for Heat Pump or Fossil Fuel and an outdoor sensor is used. When
the outdoor temperature falls below the balance point setting, the compressor is locked out and only auxiliary electric heat or fossil fuel furnace is used for heating. The factory default is OFF. Touch the UP or DOWN arrows to select a low balance point setting. Adjustable from OFF, -17° to 25°c Remote outdoor sensor must be used.
SELECTING HIGH BALANCE POINT OPTION
Menu 17 allows you to select a high balance point setting when the thermostat is configured for Heat Pump or Fossil Fuel. When the outdoor temperature rises
above the balance point setting, the auxiliary electric heat or fossil fuel furnace is locked out and only the heat pump is used for heating. The factory default is
OFF. Touch the UP or DOWN arrows to select a low balance point setting Adjustable from OFF, -18° to 50°c Remote outdoor sensor must be used
SELECTING TEMPERATURE DISPLAY FORMAT
Menu 18 allows you to select either deg C (Celsius) or deg F (Fahrenheit) display. C = Celsius (Factory Default) F = Fahrenheit
SELECTING THE EMERGENCY HEATING FUNCTION
Menu 19 enables or disables the emergency heating function. If enabled the W1relay can be manually selected for heating, locking out the heat pump.
REMOTE SENSOR INSTALLATION
REMOTE SENSOR TYPES
The 44-850 can accommodate both an indoor and outdoor remote sensor. For indoor applications, the RS1 remote sensor can be wired to the thermostat SC
and S1 terminals. Whenever an indoor remote sensor is used, the thermostat’s internal sensor is automatically disabled. The RS-1D outdoor remote sensor is wired to the SC and S2 terminals. The outdoor sensor thermistor is encapsulated and is ideally suited for ambient conditions ranging from -30 to 140°C and humidity levels of 5 to 95% RH (noncondensing).
RS1 INDOOR SENSOR INSTALLATION
Locate the sensor in the same manner as the thermostat. Mount the sensor away from any outside wall. Do not install the sensor behind doors, in corners or in other dead air spaces. Keep the sensor away from direct airflow, supply registers or near sources of heat such as lamps and appliances. The maximum wire length from the sensor to the thermostat is 50M.
Use a separate 18-2 shielded cable for sensor wiring. Prior to wiring the sensor to the thermostat, use an ohm-meter or multi-meter to measure the resistance of the sensor. Measure at the end of the wires that will connect to the thermostat. Confirm the resistance value (within 5%) to the temperature where the sensor is mounted. Refer to the Temperature/Resistance Chart on page 43 of this manual. Use a high-quality, digital electronic thermometer to read the temperature at the sensor. Remove the sensor cover and place the thermometer probe next to the thermistor to verify an accurate reading. Disconnect power to the thermostat when wiring the sensor to the proper sensor terminals. Strip only as much insulation off of the wires as necessary to provide good contact with the
terminals. The sensor is not polarity specific so either sensor lead may be connected to either designated terminal on the thermostat.
OUTDOOR SENSOR INSTALLATION
When the RS-1D is wired to the 44-850, it will display the outside air temperature as well as control high and low balance points for heat pumps and fossil fuel
system.
REMOTE SENSOR INSTALLATION
TEMPERATURE/RESISTANCE CHART
| Temperature Resistance (°C) (KΩ) | Temperature Resistance (ºC) (KΩ) | ||
| 1 | 34.6 | 21 | 11.9 |
| 4.4 | 26.1 | 27 | 9.4 |
| 10 | 19.9 | 32 | 7.4 |
| 16 | 15.3 | 38 | 5.9 |
NTC type 2 sensor – 10KΩ @ 25° c
DISPLAY FUNCTIONS
TESTING
Note: On a call for cooling, the thermostat activates a 3-minute time delay before the cooling relay ‘Y1’ is energized. After the time delay, the internal fan ‘G’ and cooling relay ‘Y1’ will energize. The word Cool will flash. If the thermostat has been configured for two-stage cooling, lower the setpoint below the second-stage differential and Cool 2 will flash indicating the ‘Y2’ cooling relay is energized. Touch MODE until the word OFF is displayed.
CONVENTIONAL HEAT PUMP
When the 44-850 is configured for conventional heat pump operation, testing is the same as a heating and cooling system with the exception that a 3-minute
time delay is activated before the ‘Y1’ compressor relay will energize on a call for heating or cooling. The fan ‘G’ relay is always energized with a call for compressor, auxiliary or emergency heat. Depending on the mode of operation and equipment configuration, Heat or Cool will flash when the ‘Y1’ compressor relay is energized. Heat 2 or Cool 2 will flash when the ‘Y2’ compressor relay is energized. Heat 3 will flash when the auxiliary ‘W1’ relay is energized. E. Heat will flash when the mode is set to emergency heat. After testing, touch MODE until the word OFF is displayed.
FOSSIL FUEL
When the 44-850 is configured for fossil fuel operation, testing is the same as a heating and cooling system with the exception that a 3-minute time delay is
activated before the ‘Y1’ compressor relay will energize on a call for heating or cooling. The fan ‘G’ relay is always energized with a call for compressor, auxiliary
or emergency heat. Depending on the mode of operation and equipment configuration, Heat or Cool will flash when the ‘Y1’ compressor relay is energized. Heat 2 or Cool 2 will flash when the ‘Y2’ compressor relay is energized. Heat 3 will flash when the auxiliary ‘W1’ relay is energized. E. Heat will flash when the mode is set to emergency heat. Whenever the thermostat calls for auxiliary heat, the heat pump compressor or compressors will be de-energized and the auxiliary heat will remain on until the call is satisfied.
LOW BALANCE POINT (Heat Pump or Fossil Fuel)
When an outdoor sensor is used with the 44-850 Installer Option 16 allows you to select a low balance point temperature. When the outdoor temperature falls
below the low balance point setting, a call for heat from the thermostat automatically energizes the ‘W1’ relay and bypasses the ‘Y1’ compressor relay. To test the low balance point setting, set Option 16 above the displayed outdoor temperature and force a call for heating. Only the auxiliary heat relay ‘W1’ should energize. After testing, reset the low balance point setting to a normal operating range.
HIGH BALANCE POINT (Heat Pump or Fossil Fuel)
High balance point is designed to prevent the auxiliary heat ‘W1’ relay from energizing when the outdoor temperature is above the balance point setting. To test the high balance point setting, set Option 17 below the displayed outdoor temperature and force a call for auxiliary heat. Only the compressor ‘Y1’ and/or ‘Y1’ and ‘Y2’ should energize. If the thermostat is placed in the E.Heat (emergency heat) mode, the ‘W1’ relay will energize. After testing, reset the high
balance point setting to a normal operating range.
ADAPTIVE RECOVERY
Adaptive Recovery is only available in programmable mode (Installer Option 01 = 7) The Adaptive Recovery function of the 44-850 permits the user to program a time that a desired set temperature is required. The thermostat then calculates the most energy-efficient time to bring on the equipment to reach the setpoint at the designated time. This calculation involves a complex control algorithm that compares the space temperature deviation from the setpoint and rate of recovery history.
PROGRAMMABLE FAN
A programmable Fan (Installer Option 04 = 0) is used to program the fan operation along with the thermostat schedule. This is a very convenient feature that allows selecting continuous (Always ON) or Automatic fan operation for each scheduled event. When Programmable Fan is used, the fan operation can still be overridden at the thermostat and will remain in the override mode until the next scheduled event.
AUXILIARY CONTACTS
The Auxiliary Contacts (Installer Option 05) provide a selectable normally open or normally closed dry contact output that works in conjunction with the
Programmable Fan feature when the thermostat is configured for programmable mode. When the fan is in continuous (Always ON) mode, the auxiliary relay coil is energized and de-energizes in Automatic mode. This feature can be used to control peripheral devices such as an economizer or outside air damper.
BASIC TROUBLESHOOTING
| SYMPTOM | POSSIBLE FAULT AND REMEDY |
| No LCD display | If the thermostat is battery powered only, remove the battery compartment and check to see that the positive (+) and negative (-) ends of each battery are oriented properly. Also make sure that the thermostat is securely attached to the subbase with no exposed gaps. |
| Thermostat can not
be set for auto changeover |
Installer Option 03 needs to be set to 0 to provide Heat/Auto/Cool/Off operation or Heat/Auto/Cool/Emergency Heat/Off for heat pumps.
03 = 1 Manual Changeover (Heat/Cool/Off) 03 = 2 Heat Only (Heat/Off) 03 = 3 Cool Only (Cool/Off) |
| Temperature display inaccurate | Air from wall cavity may be leaking into the rear of the thermostat. Seal hole where wiring enters subbase to prevent air infiltration. External influence from appliances, lighting or drafts may be affecting temperature accuracy. Move lamps or other sources of heat away from thermostat. |
| Thermostat not displaying outdoor temperature | Check wiring at outdoor sensor and sensor terminals on subbase. Outdoor sensor wires to terminals S2 and SC. |
| SYMPTOM | POSSIBLE FAULT AND REMEDY |
| Heat or Cool is flashing | This is not a fault but indicates that the thermostat heating or cooling relay is energized. Depending upon the equipment configuration, Heat 2 or Cool 2 will also be displayed if a second stage is energized. Heat 3 is also displayed for heat pumps having three heating stages. |
| Lock icon is displayed when trying to set a higher or lower temperature | This is not a fault. The thermostat heating and cooling limits are preventing setting a temperature above or below the limit values. These values can be changes in the Installer Menu.
07 = Cooling Limit. Factory default is 50° F. Adjustable from 43° F to 122° F. 08 = Heating Limit. Factory default is 90° F. Adjustable from 41° F to 120° F. |
| The fan continues to run after a heating or cooling call is satisfied | The thermostat fan mode may be set to Always On. Touch the fan icon and change it to Automatic. When the 44-850 is configured as a programmable thermostat, the fan operation can be programmed for Automatic or Always On with each event. If the Programmable Fan feature is not required, set Option 04 = 1. |
| Some functions cannot be changed and a padlock icon is displayed | Lock values have been set. Refer to Installer Option menu 06. To remove all lock values, set 06 = 0. |
SPECIFICATIONS
- Input Voltage (Hardwired) 20-30 VAC 50/60 Hz
- Relay Rating 24 VAC @ 1 Amp maximum per relay
- Battery Power (2) AA 1.5 V ALKALINE
- Operating Temperature 0°c to 65° C
- Operating Relative Humidity 0-95% RH (non-condensing)
- Storage Temperature 0° C to 65° C
- Overall Size 140W x 95 H x 35mm D
- LCD Display Size 105 W x 60mm H
- Back Light White LED
- Short-cycle Delay 4 minutes
- Displayed Temperature Resolution 1° C
- Setpoint Range
- Heating 5° C – 49° C
- Cooling 6° C – 50° C
- Heating and Cooling Limits are Fully adjustable
- Onboard and Remote Sensors NTC type 2
- Resistance 10KΩ @ 25° C
- Tolerance + / – 3% @ 25° C
- Warranty 3 years
REFERENCE:
DOWNLOAD MANUALS:
Smarttemp 44-850 Touchscreen Thermostat Installer Manual
OTHER MANUALS:
Smarttemp 44-850 Touchscreen Thermostat User Manual
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