AccuAir AS7812 Installation, Operation & Application Manual

Non-programmable electronic thermostat

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Table Of Contents

Installation, Operation & Application Guide

AS7812

Non-Programmable

Electronic Thermostat

• Controls Single Stage Heating/

Cooling Systems

• Single Stage Heat Pump Systems

• Compatible with Gas, Oil or

Electric Systems

• Millivolt and Hydronic (water or

steam) System Compatible

• Mercury-Free, Environmentally

Safe

Table of Contents

Summary of Contents for AccuAir AS7812

Page 1 AS7812 Non-Programmable Electronic Thermostat • Controls Single Stage Heating/ Cooling Systems • Single Stage Heat Pump Systems • Compatible with Gas, Oil or Electric Systems • Millivolt and Hydronic (water or steam) System Compatible • Mercury-Free, Environmentally Safe Installation, Operation & Application Guide...
Page 2: Table Of Contents
Package Contents/Tools Required .................3 General Description ....................3 To Remove Existing Thermostat ................4 To Install Thermostat ....................4 Replacing Wiring Labels ..................6 AS7812 Wiring Diagrams ..................7 A Quick Test ......................10 Operation ......................11 Troubleshooting ....................12 CAUTION!: This thermostat should be installed by trained technicians only. Adhere to all local and national codes.
Page 3: Parts Diagrams
Parts Diagrams AS7812 Reset Switch Non HP – HP Jumper NON HP–HP SC2001 ELEC Electric/Gas Mode High Temp. Freeze Jumper Switch Switch Switch Switch...
Page 4: Specifications
Specifications AS7812 Input: • Voltage: 18-30 VAC Output: • Maximum: 1 amp per terminal (3 amp total for all terminals) • Temperature control ranges: 45°F to 90°F Accuracy: ± 1°F • Differential range: 1°F to 3°F • System configurations: Single-stage heat, single-stage cool or single-stage heat pump, gas, oil,...
Page 5: Package Contents/Tools Required
Installation, Operation and Application Guide. Tools required for installation: Drill with 3/16” bit, hammer, screwdriver. General Description • The AS7812 thermostat is a digital, mercury-free, non-programmable, electronic thermostat • Compatible with single-stage heating systems, heating/cooling systems, and heat pump systems; works with gas, oil, or electric systems •...
Page 6: To Remove Existing Thermostat
To Remove Existing Thermostat ELECTRICAL SHOCK HAZARD – Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat. 1. Turn off power to the heating and cooling system by removing the fuse or switching off the appropriate circuit breaker. 2. Remove cover of old thermostat. This should expose the wires. 3.
Page 7 To Install Thermostat (continued) Move the FAN AUTO/ON switch to AUTO. To remove cover, insert and twist a coin or screwdriver in the slots on the top of the thermostat. Put thermostat base against the wall where you plan to mount it (Be sure wires will feed through the wire opening in the base of the thermostat).
Page 8: Replacing Wiring Labels
Replacing Wiring Labels Replace the old labels with the enclosed new labels: Type F, G Fan control relay Cool active reversing valve Heat active reversing valve Y, Y6 Cooling control H, W, 4 Heating control Transformer, common side M, 4, RH, RS, R Transformer, hot side If the C terminal is the cooling control, connect to Y terminal;...
Page 9: As7812 Wiring Diagrams
AS7812 Wiring Diagrams Heating and Cooling 4 or 5-Wire, Single Transformer Transformer 120 VAC 24 VAC (Optional) Heating Control Cooling Control Control...
Page 10 Heating Only 4-Wire, Single Transformer 3-Wire, Single Transformer Transformer Transformer 120 VAC 24 VAC 120 VAC 24 VAC Heating Heating Control Control Control...
Page 11 Heat Pump Cooling Only Cool Active Heat Active 4-Wire Reversing Valve Reversing Valve Single Transformer Transformer Transformer Transformer 120 VAC 24 VAC 120 VAC 24 VAC 120 VAC 24 VAC Compressor Compressor Cooling Control Contactor Contactor Reversing Valve Reversing Valve Relay Relay Control...
Page 12: A Quick Test
A Quick Test CAUTION!: Do not switch system to cool if the temperature is below 50°F. This can damage the air conditioning system and may cause personal injury. Do not short jumper across terminals on the gas valve or at the system control to test installation. Action: Set the Cool/Off/Heat switch to Cool. Press the button until the temperature setting is 3°F below the room temperature.
Page 13: Operation
Operation Setting the Room Temperature (Setpoint Temperature) Step 1: Press one of the arrow buttons; the current temperature setting displays. Step 2: Press the arrow button until the desired temperature setting displays. The new temperature setting is automatically saved. After 5 seconds, the display returns to showing the current room temperature.
Page 14: Troubleshooting
Troubleshooting Symptom Remedy The system isn’t turning on Check the wiring (see Installation, Page 7) LCD is blank 24 VAC is at thermostat. Thermostat is not properly controlling the fan Check that the Gas/Electric jumper setting matches your system (gas or electric) Thermostat is continuously turning on and off Increase the temperature differential (see Setting a New Temperature...
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Page 16 ONE-YEAR LIMITED WARRANTY The Seller warrants its products against defects in material or workmanship for a period of one (1) year from the date of manufacture. The liability of the Seller is limited, at its option, to repair, replace or issue a non-case credit for the purchase prices of the goods which are provided to be defective.