Venstar T1 900 Owner's Manual

Venstar Inc. 08/07Use with most Air Conditioning & Heating Systems including: 1 or 2 Stage Electric Cooling & 3 Stage Gas He

DEHUM JUMPER SETTINGHUM JUMPER SETTINGIf the jumper for MISC1, MISC2, or MISC3 is set to HUM, terminal on the backplate will control a humidification

Page 3.53Y2 JUMPER SETTINGIf the jumper for MISC1 is set to Y2 the will control a second stage of cooling. MISC1 screw terminal on the backplate Y2 OP

Page 4.1SECTION 4Wire Connections4If the terminal designations on your old thermostat do not match those on the new thermostat, refer to the chart be

Page 5.1Section 5 Contents: HVAC Equipment Wiring...5.2 MISC1, MISC2, and MISC3 Wiring...5.6 Remo

Y1GRCMISC2CK1CKGNDW1/O/BMISC1RS+5RS1RSGNDW26 Conductor 18 gauge unshielded cable from the thermostat to the equipment.24 vac return fan relaycompresso

Y1GRCMISC2CK1CKGNDW1/O/BMISC1RS+5RS1RSGNDW26 Conductor 18 gauge unshielded cable from the thermostat to the equipment.24 vac return fan relaycompresso

Y1GRCMISC2CK1CKGNDW1/O/BMISC1RS+5RS1RSGNDW26 Conductor 18 gauge unshielded cable from the thermostat to the equipment.24 vac return Fan RelayCompresso

Y1GRCMISC2CK1CKGNDW1/O/BMISC1RS+5RS1RSGNDW26 Conductor 18 gauge unshielded cable from the thermostat to the equipment.24 vac return W2 GR CY1RS2Reside

HPGASBOELECGAS(FAN)W1Y1GRCMISC2CK1CKGNDW2MISC1RS2RSGNDMISC3RS+5Rs1W3PROGHUMDEHUM MISC3 MISC2 MISC1Y2(MISC1ONLY)INSTALL HUMIDITY MODULE WITH SENSINGELE

HPGASBOELECGAS(FAN)W1Y1GRCMISC2CK1CKGNDW2MISC1RS2RSGNDMISC3RS+5Rs1W3PROGHUMDEHUM MISC3 MISC2 MISC1Y2(MISC1ONLY)INSTALL HUMIDITY MODULE WITH SENSINGELE

Page iNOTE: Due to variations in environmental conditions, it is not always possible to achieve the desired humidification or dehumidification setpoi

CK1 and CK2 terminals wired to a Time ClockDRY CONTACT SWITCH - The terminals are ‘normally open’ (or may be programmed for normally closed ope

Press the MODE button repeatedly until the HEAT icon appears on the display. Press UP or DOWN buttons until the set temperature is 10 degrees above r

Page 7.17OFFI2:0072PmCALIBRATEAfter calibration is complete, press the MODE button once to return to normal operation.PRESSTWICEMODEFANMODEMODEPress b

Page 8.1SECTION 8TroubleShooting8SYMPTOM: The air conditioning does not attempt to turn on.CAUSE: The compressor timer lockout may prevent t

SYMPTOM: When controlling a residential heat pump, and asking for cooling, the heat comes on.CAUSE: The thermostat reversing valve jumper is

82136745PreparationRemove & Replace the Old ThermostatConfiguring the MISCOutputsWiring DiagramsCalibrating the Thermostat SensorsTest OperationT

Page 1.1SECTION 1Preparation1Assemble tools Flat BladeScrewdriverWire cutter& StripperMake sure your Heater/Air Conditioner is working properly be

Page 2.1SECTION 2Remove & Replace the Old Thermostat2Remove the cover of the old thermostat.If it does not come off easily check for screws.Loosen

3Page 3.1Section 3 Contents: Configuring the Jumpers...3.2 Explanation of Jumper Settings...3.3 SECTION 3Co

3Page 3.2Configuring the JumpersNEVER PUT MORE THAN ONE JUMPER ON THE SAME MISC JUMPER BLOCK!DOING SO MAY DAMAGEYOUR THERMOSTAT AND VOID THE WARRANTY.

Page 3.3W3 JUMPER SETTINGIf the jumper for MISC1, MISC2, or MISC3 is set to W3, the corresponding MISC screw terminal on the backplate will control a