residential THERMOSTAT Digital Thermostat T1900 7-DAY PROGRAMMABLE up to 3-heat & 2-cool HEAT COOL HEAT PUMP with HUMIDITY CONTROL Control up to 3 Heat & 2 Cool Stages 3 Configurable Outputs Adjustable 2nd & 3rd Stage Timers & Deadbands Backlit Display & Button Legends Aux Heat Indicator Dry Contact Equipped Outdoor Sensor Ready with High/Low Readouts for the Day Equipped with Optional Humidity Module: Controls Humidification, Dehumidification and Reheat Programmable Output Accepts EZ Programmer Ac
CAUTION Follow the Installation Instructions before proceeding. Set the thermostat mode to “OFF” prior to changing settings in setup or restoring Factory Defaults. CAUTION NEVER PUT MORE THAN ONE JUMPER ON THE SAME MISC JUMPER BLOCK! THIS MAY DAMAGE YOUR THERMOSTAT AND VOID YOUR WARRANTY. MISC3 MISC3 OK NOTE: Due to variations in environmental conditions, it is not always possible to achieve the desired humidification or dehumidification setpoint. This device complies with Part 15 of the FCC Rules.
Table of Contents Preparation Remove & Replace the Old Thermostat Configuring the MISC Outputs Wire Connections Wiring Diagrams Test Operation Calibrating the Thermostat Sensors TroubleShooting Page iii 1 2 3 4 5 6 7 8
SECTION 1 Preparation 1 I2:00 Pm 74 COOL AUTO 72 HEAT I2:00 Pm 74 Proper installation of the thermostat will be accomplished by following these step by step instructions. If you are unsure about any of these steps, call a qualified technician for assistance.
SECTION 2 Remove & Replace the Old Thermostat I2:00 Pm 74 COOL AUTO 72 HEAT I2:00 Pm 74 COOL AUTO 72 HEAT I2:00 Pm 74 COOL AUTO 72 HEAT I2:00 Pm 74 COOL AUTO 72 HEAT Remove the cover of the old thermostat. If it does not come off easily check for screws. 2 Loosen the screws holding the thermostat base or subbase to the wall, and lift away. Disconnect the wires from the old thermostat.
SECTION 3 Configuring the MISC Outputs 3 Section 3 Contents: Configuring the Jumpers........3.2 Explanation of Jumper Settings..................................3.3 Page 3.
Configuring the Jumpers For additional flexibility, your thermostat has three configurable 3 outputs. These outputs are designed to have different functions depending on how the jumpers are set (below). Each output, labeled MISC1, MISC2, and MISC3 may be set for one of the five choices available.
Explanation of Jumper Settings 3 W3 JUMPER SETTING If the jumper for MISC1, MISC2, or MISC3 is set to W3, the corresponding MISC screw terminal on the backplate will control a third stage of heat. W3 MULTI-STAGE OPERATION EXPLAINED - SECTION 14 of the Owner’s Manual The 3rd Stage of Heat is turned on when: (A) The 1st and 2nd stages have been on for the time required (steps 27 and 28, page 14.6). It is adjustable from 0-60 minutes and the default And is two minutes.
Explanation of Jumper Settings (continued) 3 HUM JUMPER SETTING If the jumper for MISC1, MISC2, or MISC3 is set to HUM, the corresponding MISC screw terminal on the backplate will control a humidification system. HUMIDIFICATION OPERATION - SECTION 9 of the Owner’s Manual If your HVAC unit is equipped with a humidification system the thermostat will provide power to the MISC1, MISC2, or MISC3 terminal of the thermostat when the humidity in the home falls below the humidity setpoint you have chosen.
Explanation of Jumper Settings (continued) 3 Y2 JUMPER SETTING If the jumper for MISC1 is set to Y2 the MISC1 screw terminal on the backplate will control a second stage of cooling. Y2 OPERATION - SECTION 14 of the Owner’s Manual Control up to two Cool stages. The 2nd Stage of heat or cool is turned on when: (A) The 1st Stage has been on for the time required (step #27, page 14.6). It is adjustable from 0-60 minutes and the default is two minutes.
SECTION 4 Wire Connections I2:00 Pm 74 COOL AUTO 72 HEAT If the terminal designations on your old thermostat do not match those on the new thermostat, refer to the chart below, or the wiring diagrams 4 that follow. Wire from the old thermostat terminal marked Function Install on the new thermostat connector marked G or F Fan G Y1, Y or C Cooling Y1 W1, W or H Heating W1/O/B Rh, R, M, Vr, A Power R C Common C Rev.
SECTION 5 Sample Wiring Diagrams Section 5 Contents: 5 HVAC Equipment Wiring............5.2 MISC1, MISC2, and MISC3 Wiring........................................5.6 Remote Sensor, Outdoor Sensor and CK1-CK2 wiring for the Time Clock................................5.8 Page 5.
6 Wire, 1 Stage Cooling, 1 Stage Heat Residential & Commercial 1 Stage Cooling, with 1st stage Gas Heat OR Commercial Heat Pump 1 Stage Cooling with 2 Stage Heat 5 W2 MISC1 RS2 MISC3 RS+5 RS1 RSGND GAS (FAN) ELEC W1/O/B Y1 G MISC2 CK1 CKGND R C HP ELEC GAS (FAN) GAS W3 PROG HP GAS HUM DEHUM MISC3 MISC2 MISC1 Y2 B (MISC1 ONLY) O W1 G NO HUM W2 Y1 HUM B MISC1 RS2 MISC2 MISC3 CK1 RSGND 8 4 Z Y 7 3 1 R fan relay G compressor relay W2 W1 Y1 1st stage heat circuit Rs1 C
6 Wire, 1 Stage Cooling, 1 Stage Heat Residential & Commercial 1 Stage Cooling, with 1st stage Electric Heat 5 W2 MISC1 RS2 MISC3 RS+5 RS1 RSGND GAS (FAN) ELEC W1/O/B Y1 G MISC2 CK1 CKGND R C HP ELEC GAS (FAN) GAS W3 PROG HP GAS HUM DEHUM MISC3 MISC2 MISC1 Y2 B (MISC1 ONLY) O W1 HUM G NO HUM W2 Y1 B MISC1 RS2 MISC2 O MISC3 CK1 24 vac return R fan relay G compressor relay W2 W1 Y1 24 vac common 1st stage heat circuit 2nd stage heat circuit Z 8 4 6 1 X 2 1 RSGND Y
6 Wire, 1 Stage Cooling, 2 Stage Heat Residential Heat Pump with O Reversing Valve 1 Stage Cooling, with 2 stage Heat 5 W2 MISC1 RS2 MISC3 RS+5 RS1 RSGND GAS (FAN) ELEC W1/O/B Y1 G MISC2 CK1 CKGND R C HP ELEC GAS (FAN) GAS W3 PROG HP GAS HUM DEHUM MISC3 MISC2 MISC1 Y2 B (MISC1 ONLY) O W1 G NO HUM W2 Y1 HUM B MISC1 RS2 MISC2 MISC3 CK1 1 8 4 Z Y 7 RSGND R Fan Relay G C 3 Rs1 Reversing Valve O 2nd stage heat circuit W2 Y1 24 vac return Compressor Relay 5 INSTALL
6 Wire, 1 Stage Cooling, 2 Stage Heat Residential Heat Pump with b Reversing Valve 1 Stage Cooling, with 2 stage Heat 5 W2 MISC1 RS2 MISC3 RS+5 RS1 RSGND GAS (FAN) ELEC W1/O/B Y1 G MISC2 CK1 CKGND R C HP ELEC GAS (FAN) GAS W3 PROG HP GAS HUM DEHUM MISC3 MISC2 MISC1 Y2 B (MISC1 ONLY) O W1 HUM G NO HUM W2 Y1 B MISC1 RS2 MISC2 O MISC3 CK1 R Fan Relay Reversing Valve b 2nd stage heat circuit W2 Compressor Relay Z 8 4 6 1 X 2 1 Y 7 3 RSGND Y1 24 vac return G 24 va
Adding a 2nd Stage of Cooling (MISC1), Sprinkler System (MISC2), and 3rd Stage of Heating or Dual Fuel Applications (MISC3) 5 W2 MISC1 RS2 MISC3 RS+5 RS1 RSGND W1/O/B Y1 G MISC2 CK1 CKGND R C W3 GAS (FAN) ELEC PROG W3 PROG HP GAS HUM DEHUM MISC3 MISC2 MISC1 Y2 B (MISC1 ONLY) O W1 W2 HUM Y1 G NO HUM HUM MISC1 RS2 MISC2 MISC3 CK1 MISC3 MISC2 MISC1 3rd Stage Heat or Dual Fuel 2nd Stage Cooling Y2 W3 Sprinkler System Page 5.
Adding a Humidification System (MISC1) and Dehumidification System (MISC2) 5 W2 MISC1 RS2 MISC3 RS+5 RS1 RSGND W1/O/B Y1 G MISC2 CK1 CKGND R C W3 GAS (FAN) ELEC PROG W3 PROG HP GAS HUM DEHUM MISC3 HUM MISC2 MISC1 Y2 B (MISC1 ONLY) O W1 HUM G NO HUM W2 Y1 MISC1 RS2 MISC2 DEHUM MISC3 CK1 Y2 MISC3 MISC2 MISC1 (MISC1 ONLY) Dehumidification System Humidification System Page 5.
CK1 and CK2 terminals wired to a Time Clock For instructions on wiring the optional Remote and Outdoor Sensors, please see page 16.2 of the Owner’s Manual 5 W2 MISC1 RS2 MISC3 RS+5 RS1 RSGND W1/O/B Y1 G MISC2 CK1 CKGND R C 11 12 1 2 10 3 9 4 8 7 6 5 DRY CONTACT SWITCH - The terminals are ‘normally open’ (or may be programmed for normally closed operation, see page 17.2 of the Owner’s Manual).
SECTION 6 Test Operation I2:00 Pm Turn the power on to the Heating/Air Conditioning system. 74 COOL AUTO 72 HEAT I2:00 Pm 74 COOL AUTO 72 HEAT 6 I2:00 Pm 74 COOL AUTO 72 HEAT I2:00 Pm 74 COOL AUTO 72 HEAT Press the MODE button repeatedly until the HEAT icon appears on the display. Press the UP or DOWN buttons until the set temperature is 10 degrees above room temperature. The furnace should turn on. Press the MODE button repeatedly until the COOL icon appears on the display.
SECTION 7 Calibrating the Thermostat Sensors Under normal circumstances it will not be necessary to adjust the calibration of the temperature and humidity sensors. If calibration is required, please contact a trained HVAC technician to correctly perform the following procedure. I2:00 Su MODE MODE FAN Place the thermostat in the OFF mode. Press and hold the MODE button. While holding the MODE button, press and hold the FAN button for 5 seconds. All icons will appear on the display.
SECTION 8 TroubleShooting I2:00 Pm 74 COOL AUTO 72 HEAT SYMPTOM: The air conditioning does not attempt to turn on. CAUSE: The compressor timer lockout may prevent the air conditioner from turning on for a period of time. REMEDY: Consult the Owner's Manual in the Setup section to defeat the cycles per hour and compressor timeguard. 8 I2:00 Pm 74 COOL AUTO 72 HEAT I2:00 Pm 74 COOL AUTO 72 HEAT I2:00 Pm 74 COOL AUTO 72 HEAT SYMPTOM: The display is blank. CAUSE: Lack of proper power.
TroubleShooting I2:00 Pm 74 COOL AUTO 72 HEAT I2:00 Pm 74 COOL AUTO 72 HEAT SYMPTOM: When controlling a residential heat pump, and asking for cooling, the heat comes on. CAUSE: The thermostat reversing valve jumper is set for “b”. REMEDY: Set the reversing valve jumper for “O”. See pages 5.4 and 5.5. SYMPTOM: When calling for cooling, both the heat 8 and cool come on. CAUSE: The thermostat equipment jumper is configured for “HP” and the HVAC unit is a Gas/Electric.
