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ELECTRONIC THERMOSTATS
Important Safety Information Warning:
•
Always turn off power at the main power source by unscrewing
fuse or switching circuit breaker to the off position before installing,
removing, cleaning, or servicing thermostat.
•
Read all of the information in this manual before installing or
programming this thermostat.
•
This is a 24V AC low-voltage thermostat. Do not install on voltages
higher than 30V AC.
•
All wiring must conform to local and national building and electrical
codes and ordinances.
•
Do not short (jumper) across terminals on the gas valve or at the
system control to test installation. This will damage the thermostat
and void the warranty.
MODEL 8355
7 Day Programmable
2 Heat / 2 Cool
Heat Pump
User's Manual
Installation and
Programming
1
®
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Related Manuals for Aprilaire 8355
Summary of Contents for Aprilaire 8355
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Page 1: Heat Pump
Do not short (jumper) across terminals on the gas valve or at the system control to test installation. This will damage the thermostat and void the warranty. ® MODEL 8355 7 Day Programmable 2 Heat / 2 Cool Heat Pump User’s Manual... -
Page 2: Replacing Existing Thermostat
Features • Four pre-programmed setpoints for each day of the week. • Fast and easy programming for setting all days of the week simultaneously. • Energy efficient recovery. • Residual cooling for added air-conditioning efficiency. • Two “AA” ENERGIZER brand batteries retain program memory, even during power outages. - Page 3 Installing the Model 8355 Thermostat NOTE: For new installations, mount thermostat on inside wall, 4-5 feet above the floor. Do not install behind a door, in a corner, near air vents, in direct sunlight, or near any heat or steam generating fixtures. Installation at these places will affect thermostat operation.
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Page 4: Mounting Holes
MOUNTING HOLES MORN DAY EVE NITE EER CHANGE CHANGE 7. Drill the marked holes using a 3/16" drill bit. NOTE: Enclosed plastic anchors do not require a drilled hole for drywall. 8. Tap plastic anchors into the holes. 9. Align base with plastic anchors and feed wires through opening. See Fig 4. -
Page 5: Programming Guide
Programming Guide Set Time of Day, Day of Week, Temperature Differential, Residual Cooling 1. Press SET & PROG/MAN. Release simultaneously. PROG SET PROG/MAN Press Time of Day. 2. Press SET P 4. Press SET P NOTE: The Temperature Differential is Factory preset at 1°. This means that whenever the room temperature changes by one full degree from the temperature setting, the system will turn on. -
Page 6: Changing Fahrenheit (F) To Celsius (C)
Changing Fahrenheit (F) to Celsius (C) Press and Hold SET SET P Release both simultaneously. Energy Efficient Recovery The energy efficient recovery feature looks ahead up to 2 hours prior to the end of the setback (or set-up) period to begin monitoring performance and calculating when to turn on your system. - Page 7 Setting Daily Programming 1. Place COOL-OFF-HEAT-EM in COOL position. PROG SET PROG/MAN 2. Press SET button. The display will show a number from 1 to 7. This number represents the day of the week to be programmed. If programming individual days, press either button to adjust the day of the week to program (1=Mon., 2=Tues., etc.).
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Page 8: Temporary Program Override
3. Press PROG/MAN button until indicator is in PROG position. PROG SET PROG/MAN COOL-OFF-HEAT-EM NOTE: While in the Cool or Heat mode, once the thermostat turns the system off, a built-in delay keeps the compressor from turning on for about 5 minutes. This protects the compressor. -
Page 9: Led Indicators
To Test Thermostat WARNING: DO NOT SHORT (JUMPER) ACROSS TERMINALS OF GAS VALVE OR SYSTEM CONTROL TO TEST OPERATION. THIS WILL DAMAGE THE THERMOSTAT AND VOID YOUR WARRANTY. CAUTION: Do not switch system to cool if the temperature is below 50°F (10°C). -
Page 10: Troubleshooting
Troubleshooting SYMPTOM Thermostat does not turn on system. Thermostat turns on and off too frequently. Display is blank, flashing or constant "LO BAT." Time shown on display is not the current time of day. Thermostat does not follow program. Thermostat does not advance day of week. -
Page 11: Wiring Diagrams
The following is just a sample of the most common types of HVAC systems. Refer to your system’s installation manual for wiring information. APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT CONVERSION TO CARRIER SPLIT SYSTEM CONDENSORS AND HEAT PUMP SYSTEMS 24 VAC, RETURN... - Page 12 APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT CONVERSION TO COMFORTMAKER NOTE 1: E AND W2 TERMINALS JUMPERED AT THERMOSTAT NOTE 2: W2 TERMINAL ON COMFORTMAKER PCB CAPPED NOTE 3: X TERMINAL ON COMFORTMAKER PCB CAPPED 24 VAC, RETURN COMPRESSOR CONTACTOR REVERSING VALVE [COOLING MODE] FAN CONTACTOR CIRCUIT 2ND.
- Page 13 APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT CONVERSION TO PAYNE RELIANT AND ENDURA MODEL HEAT PUMP SYSTEMS NOTE 1: W3 TERMINAL ON PAYNE PCB CAPPED 24 VAC, RETURN COMPRESSOR CONTACTOR REVERSING VALVE [COOLING MODE] FAN CONTACTOR CIRCUIT EMERGENCY HEATING CIRCUIT 2ND. STAGE HEATING CIRCUIT...
- Page 14 THE LOW VOLTAGE TERMINAL DESIGNATIONS AND THEIR DESCRIPTION AND/OR FUNCTION ARE USED ON ALL SPLIT SYSTEM CONDENSORS AND HEAT PUMPS APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT CONVERSION TO YORK -E1CS, -E1FB, -E1FH HEAT PUMP SYSTEMS NOTE 1: E AND W2 TERMINALS...
- Page 15 APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT CONVERSION TO LENNOX 24 VAC, RETURN COMPRESSOR CONTACTOR REVERSING VALVE [COOLING MODE] FAN CONTACTOR CIRCUIT EMERGENCY HEATING CIRCUIT 2ND. STAGE HEATING CIRCUIT SYSTEM MONITOR LED 24 VAC, COMMON THE LOW VOLTAGE TERMINAL DESIGNATIONS AND THEIR DESCRIPTION AND/OR...
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Page 16: Limited Warranty
APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT CONVERSION TO LENNOX HP21 WITH CB21 PCB HEAT PUMP SYSTEMS 24 VAC, RETURN R-VR COMPRESSOR CONTACTOR REVERSING VALVE [COOLING MODE] FAN CONTACTOR CIRCUIT EMERGENCY HEATING CIRCUIT 2ND. STAGE HEATING CIRCUIT 24 VAC, COMMON THE LOW VOLTAGE TERMINAL DESIGNATIONS AND THEIR DESCRIPTION AND/OR...
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