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1F94-80
Multi-stage Electronic Digital Thermostat
WHITE-RODGERS
INSTALLATION INSTRUCTIONS
Operator: Save these instructions for future use!
FAILURE TO READ AND FOLLOW ALL INSTRUCTIONS CAREFULLY
BEFORE INSTALLING OR OPERATING THIS CONTROL COULD CAUSE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
DESCRIPTION
This wall-mounted, low voltage thermostat maintains
room temperature by controlling the operation of multi-
stage systems. Use this thermostat for applications re-
quiring up to two stages of heat
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SPECIFICATIONS THIS CONTROL IS DESIGNED FOR USE WHERE BOTH SIDES OF THE TRANSFORMER ARE PRESENT TO THE THERMOSTAT (both the hot and common sides of the 24vAC end of the transformer.) ELECTRICAL DATA THERMAL DATA Electrical Rating: Setpoint Temperature Range: 20 to 30v AC 50/60 Hz. 40° F to 99°F (4°C to 37° C) 0.01 to 1.5 Amps (Load per terminal) Operating Ambient Temperature Range: 2.5 Amps Maximum Total Load (All terminals 32°F to 105°F combined) Operating Humidity Range: Anticipation: 0 t
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REPLACEMENT INSTALLATION REMOVE OLD THERMOSTAT 1. Shut off electricity at the main fuse box until installa- tion is complete. Verify power is off with a voltmeter. 2. Remove the front cover of the old thermostat. With wires still attached, remove wall plate from the wall. PULL STRAIGHT OUT 3. If the old thermostat has a wall mounting plate, remove the thermostat and the wall mounting plate as Figure 2. Removing thermostat from subbase an assembly. 4. Use the Cross Reference Guide to find the th
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Expansion 2. Connect wires beneath terminal screws on sub- plugs base using appropriate wiring schematic (see figs. Connect wires under terminal screws 3 through 6). 3. Place subbase over hole in wall and mark mounting hole locations on wall using subbase as a template. S1S2 S3 Mounting 4. Move subbase out of the way. Drill mounting holes. O W1 hole B E1 4-pin connector Mounting Y1 E2 5. Fasten subbase loosely to wall, as shown in fig. 3, Y2 L hole C R G W2 using two mounting screws. Place a
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NOTE IF SAFETY CIRCUITS ARE IN ONLY ONE OF THE SYSTEMS, REMOVE THE TRANSFORMER OF THE SYSTEM WITH NO SAFETY CIRCUITS. Malfunction Thermostat Light Control Circuit THERMOSTAT O B Y1 Y2 G A1 W1 E1 E2 W2 C L R SYSTEM Emergency Changeover Compressor System Damper Limit or CUT AND Relay Monitor Energized Contactor Motor Safety Constant TAPE OFF! Switch In Heat Stage 2 Output Switches Hot Changeover Emergency Heat Compressor Heat Limit or 120vAC 24vAC Fan TRANSFORMER Relay Energized Relay Contactor Re
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tors and the plastic snaps lock into place (see fig. 7). Be ATTACH THERMOSTAT TO SUBBASE gentle when attaching thermostat. If the thermostat does not seem to be attaching to the subbase easily, WE RECOMMEND THAT YOU SET OPTION SWITCHES make sure that the connector pins and plastic snaps are TO DESIRED POSITION BEFORE ATTACHING ON properly aligned, and that excess wire is pushed into the SUBBASE (see OPERATION). WE ALSO RECOM- wall. Damage to the thermostat may occur if force is MEND THAT YOU PRO
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EMERGENCY MODE OPERATION CHECK THERMOSTAT OPERATION SYSTEM FAN OPERATION 1. Press until EMER is displayed. The red SWITCH EMER LED should be lit continuously (non-flashing), 1. Turn on power to the system. If the auxiliary heat regardless of system cycling. source has a standing pilot, be sure to light it. 2. Press to adjust thermostat about 5°F above FAN room temperature. Any systems (such as electric 2. Press until FAN ON is displayed. The blower SWITCH strip heaters, fossil fuel systems, e
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If you need further information about this product, please write to White-Rodgers Division, Emerson Electric Co. 9797 Reavis Road St. Louis, MO 63123-5398 Attention: Technical Service Department WARRANTY INFORMATION THIS WARRANTY STATEMENT SUPERSEDES ALL WARRANTY This warranty extends only to persons or organizations who STATEMENTS DATED PRIOR TO OCTOBER 1, 1991. purchase the Products for resale. THE FOREGOING CONSTI- TUTES SELLER’S SOLE RESPONSIBILITY UNDER THIS WAR- White-Rodgers Division of
