Wiring Connections, Operation | Carrier 48/50HJ004-024, 48/50TF

Thermostat Installation — Begin the thermostat in- stallation by determining where the thermostat will be located. In most cases, this will be pre-determined by the building plans.

Locate the thermostat on an interior wall, about 5 ft from the ground. The thermostat should be located away from direct sunlight, drafts, or interior heat sources which may influence temperature readings.

The thermostat may also be mounted in a remote location with the use of an optional remote room sensor. Refer to the specific thermostat information for more details on thermostat installation.

Wiring Connections

Electric shock can cause injury or death. Ensure power to the rooftop unit has been disconnected, before wiring.

WIRE APOLLO CONTROL TO THERMOSTAT — Wire each thermostat to its respective Apollo control as shown in Fig. 6. Make wiring connections at the wiring connector board of the thermostat.

WIRE THERMOSTAT TO COMMUNICATION BUS — The thermostat is connected to the communication bus through the thermostat wiring connection block. Connect the black, red, and green wires from the communication bus to the thermostat wiring connection block. See Fig. 6. To connect other devices to the communication bus, refer to the application manual for that device.

Provide Power To Apollo Control — After the wir- ing has been completed, provide power to the Apollo control. Once power has been provided, the Apollo control will power the thermostat. The heating (if applicable) and/or cooling set points will appear on the thermostat display screen. The ther- mostat is now ready to be programmed. If the display is blank or blinking, recheck the wiring connections between the ther- mostat and Apollo control.

OPERATION

There are 3 system switches which are used to control oper- ation at the thermostat: Heat, Cool, and Fan. The Heat and Cool switches can be set to either AUTO. or OFF position. The Fan switch can be set to either AUTO or ON position. When the fan is running, the FAN indicator will be shown on the ther- mostat display screen. When Cooling mode is energized, the COOL indicator will be shown on the thermostat display screen. When Heating mode is energized, the HEAT indicator will be shown on the thermostat display screen. When the second stage of heating or cooling is energized, a decimal point is displayed between the heating and cooling set points.

AUTO. Fan Mode — The fan will energize any time the system energizes heating or cooling. The only exception is when the thermostat controls a gas heating rooftop unit. In this application, the thermostat will allow the rooftop unit to control the fan during Heating mode, and the fan will run in Cooling mode.

ON Fan Mode — The fan will operate continuously dur- ing the occupied mode. In unoccupied mode, the fan will only operate when a system mode is energized.

AUTO. Heating Mode — When the Heat switch is set to AUTO. position, the Apollo control will energize heating when the heating demand is 1.5° F or greater. The second stage of heating will energize when the demand becomes 2.0° F or greater.

OFF Heating Mode — When the Heat switch is set to OFF position, the Apollo control will not allow the rooftop unit to energize heating.

AUTO. Cooling Mode — When the Cool switch is set to AUTO. position, the Apollo control will energize cooling when the cooling demand is 1.5° F or greater. The second stage of cooling will energize when the demand becomes 2.0° F or greater.

OFF Cooling Mode — When the Cool switch is set to OFF position, the Apollo control will not allow the rooftop unit to energize cooling.

Temperature Trend Staging — When the Tempera- ture Trend Staging option has been configured at the thermo- stat, the thermostat tracks the temperatures at regular intervals in each cooling or heating mode. As long as the space tempera- ture is improving, the Apollo control will not allow the second stage to be energized. If the space temperature stays the same or the demand becomes greater, the second stage will energize.

Heating Lockout — When the heating lockout tempera- ture set point has been configured, and the heating lockout op- tion has been configured to ON, the Apollo control will not al- low heating to energize when the outdoor-air temperature rises above the heating lockout set point.

Cooling Lockout — When the cooling lockout tempera- ture set point has been configured, and the cooling lockout op- tion has been configured to ON, the Apollo control will not al- low cooling to energize when the outdoor-air temperature drops below the cooling lockout set point.

Time-Delay Relay — The thermostat and the Apollo control utilize a 5-minute time delay between the different modes of operation for the rooftop unit. When a mode of oper- ation is deenergized, another mode cannot begin for 5 minutes.

TM004-014, TM016-028, 48/50TF, 50HJQ004-016, 48/50TJ specifications

Carrier has long been a leader in the heating, ventilation, and air conditioning (HVAC) industry, and their line of rooftop units, including the models 50TFQ004-012, 48/50HJ004-024, 48/50TJ, 50HJQ004-016, and 48/50TF, exemplifies their commitment to innovation and efficiency. These units are designed to meet the diverse needs of commercial buildings while providing precise climate control, reliability, and efficiency.

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Furthermore, the models in this line come equipped with user-friendly control systems. These systems provide intuitive management and monitoring capabilities, allowing building operators to easily adjust settings and schedules. This feature ensures that energy consumption is kept to a minimum while maintaining optimal comfort levels.

Finally, Carrier incorporates advanced diagnostic features in these rooftop units, enabling proactive maintenance and reducing downtime. Through real-time monitoring, any potential issues can be addressed before they become significant problems.

In conclusion, Carrier's 50TFQ004-012, 48/50HJ004-024, 48/50TJ, 50HJQ004-016, and 48/50TF rooftop units blend powerful performance with cutting-edge technology. Their energy-efficient design, reliable components, and advanced control systems make them an excellent choice for any commercial HVAC application, ensuring a comfortable and cost-effective indoor environment.