Emerson 1F78H Check Thermostat Operation, Fan Operation, Cooling System, Heating System

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4 MOUNTING AND WIRING

CONTINUED FROM SECOND PAGE

 

 

 

 

 

 

JUMPER

 

 

 

 

 

 

 

WIRE

 

C

B

O

Y

G

W

RC RH

THERMOSTAT

SYSTEM

 

 

 

 

 

 

 

 

 

NOTE

 

Fan

Heating

 

 

 

For Heat only,

 

Relay

System

 

Hot

 

attach to RH and W

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 VAC

120 VAC

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

TRANSFORMER

Figure 2. Typical wiring diagram for

heat only, 4-wire, single transformer systems

C B O Y G W

 

 

 

 

 

 

Cooling

 

Fan

 

Heating

System

 

Relay

 

System

 

 

 

 

 

 

RC RH

THERMOSTAT

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

 

24 VAC

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

HEATING

 

TRANSFORMER

24 VAC

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COOLING TRANSFORMER

 

 

 

 

 

JUMPER

 

 

 

 

 

 

WIRE

 

C

B

O

Y

G W

RC RH

THERMOSTAT

SYSTEM

 

 

 

 

 

 

 

 

 

Cooling

Fan

 

 

 

 

 

System

Relay

 

Hot

 

 

 

 

 

24 VAC

120 VAC

 

 

 

 

 

 

Neutral

 

 

 

 

 

TRANSFORMER

Figure 3. Typical wiring diagram for

cool only, 4-wire, single transformer systems

 

 

 

 

 

NOTE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RED jumper wire (provided with thermostat) must be

 

 

 

 

 

 

 

 

 

 

connected between thermostat RH and RC terminals

JUMPER

 

 

 

 

 

 

 

 

for proper thermostat operation with this system.

WIRE

 

 

 

 

 

 

 

 

C

B

O

 

Y

 

G

 

W

RC RH

THERMOSTAT

 

 

 

 

 

 

SYSTEM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cooling

 

Fan

 

Heating

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

System

 

Relay

 

System

 

 

 

 

 

 

 

 

 

Hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 VAC

 

 

 

 

 

 

 

120 VAC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Neutral

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TRANSFORMER

Figure 4. Typical wiring diagram for

heat/cool, 5-wire, single transformer systems

Figure 5. Typical wiring diagram for

heat/cool, 6-wire, two-transformer systems

JUMPER JUMPER

WIREWIRE

C B O

Y

G W

RC RH

THERMOSTAT

SYSTEM

 

 

 

 

Reversing

Compressor

Fan

 

 

Valve*

Contactor

Relay

 

Hot

 

 

 

24 VAC

120 VAC

* Reversing valve is energized when the

 

Neutral

system switch is in the COOL position

TRANSFORMER

 

 

 

Figure 6. Typical wiring diagram for heat pump

with reversing valve energized in COOL

JUMPER JUMPER

WIREWIRE

C

B

O

Y

G W

RC RH

THERMOSTAT

SYSTEM

 

 

 

 

 

 

 

Reversing

Compressor

Fan

 

 

 

Valve*

 

Contactor

Relay

 

Hot

 

 

 

 

 

24 VAC

120 VAC

 

* Reversing valve is energized when the

 

Neutral

 

system switch is in the HEAT position

TRANSFORMER

Figure 7. Typical wiring diagram for heat pump

with reversing valve energized in HEAT

5 CHECK THERMOSTAT OPERATION

NOTE

To prevent static discharge problems, touch side of ther- mostat to release static build-up before touching any keys.

If at any time during testing your system does not operate properly, contact a qualified serviceperson.

Fan Operation

If your system does not have a G terminal connection, skip to Heating System.

1.Turn on power to the system.

2.Move fan switch to ON position. The blower should begin to operate.

3.Move fan switch to AUTO position. The blower should stop immediately.

Cooling System

!CAUTION

To prevent compressor and/or property damage, if the outdoor temperature is below 50°F, DO NOT operate the cooling system.

This thermostat has a time delay between cooling cycles to allow the head pressure in the compressor to stabilize. If the tempera- ture is adjusted to call for cool within 5 minutes of the last cycle the snowflake icon will blink indicating the thermostat is locked out. After 3 to 5 minutes, the compressor will start and the snowflake icon will stop flashing. This helps prevent the compressor from cycling too quickly and is normal operation for the thermostat.

1.Move SYSTEM switch to COOL position.

2.Press to adjust thermostat setting below room tempera- ture. The blower should come on immediately on high speed, followed by cold air circulation

3.Press to adjust temperature setting above room tem- perature. The cooling system should stop operating.

Heating System

1.Move SYSTEM switch to HEAT position. If the heating system has a standing pilot, be sure to light it.

2.Press to adjust thermostat setting above room tempera- ture. The heating system should begin to operate.

3.Press to adjust temperature setting below room tem- perature. The heating system should stop operating.

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Contents Thermostat Details ContentsYour Thermostat Replaces PreparationsAttach Thermostat Base to Wall Mounting and WiringElectric Heat or Single-Stage Heat Pump Systems Hydronic Hot Water or Steam Heating SystemsHeating System Check Thermostat OperationFan Operation Cooling SystemDisplay Configuration MenuThermostat Buttons and Switches Operating FeaturesTroubleshooting SpecificationsHeat, Cool or Fan Runs Constantly Narrow or wide temperature swingThermostat Setting and Thermostat No Cool

1F78H specifications

The Emerson 1F78H is a cutting-edge thermostat designed to elevate the user experience while optimizing HVAC system performance. As a leading product from Emerson, it combines advanced features, user-friendly technology, and smart energy management to ensure maximum comfort in residential settings. Designed with efficiency in mind, the Emerson 1F78H is ideal for both heating and cooling systems, making it a versatile option for various home environments.

One of the standout features of the Emerson 1F78H is its smart learning capability. Over time, the thermostat learns the homeowner's habits and preferences, creating a personalized schedule that adjusts heating and cooling to align with the user's lifestyle. This not only enhances comfort but also leads to significant energy savings, as the system intelligently reduces energy consumption during periods when no one is home.

The Emerson 1F78H boasts a sleek, modern design that complements any home décor. The intuitive interface features a bright, easy-to-read display, making navigation simple even for those who may not be tech-savvy. The built-in touchscreen allows users to access settings effortlessly, while the intuitive menu guides help in setting preferred modes and schedules.

Another important characteristic of the Emerson 1F78H is its compatibility with various HVAC systems, including conventional systems, heat pumps, and multi-stage systems. This versatility ensures that it can seamlessly integrate into most residential setups, making it a practical choice for homeowners looking to upgrade their thermostat without overhauling their existing heating and cooling systems.

The thermostat also includes Wi-Fi connectivity, allowing for remote access via a smartphone app. This feature empowers users to monitor and control their home's temperature from virtually anywhere, providing enhanced convenience. In addition, the Emerson 1F78H is compatible with popular voice assistant devices, enabling voice control for a truly hands-free experience.

In terms of energy-saving technologies, the Emerson 1F78H incorporates features like energy usage reporting and alerts for high energy consumption. These insights enable users to make informed decisions about their energy usage, ultimately contributing to lower utility bills.

Overall, the Emerson 1F78H is a top-tier thermostat that combines modern technology with user-friendly features. Its smart learning capabilities, stylish design, extensive compatibility, and remote access make it an excellent choice for homeowners aiming to create a more comfortable and energy-efficient living environment.