This furnace is manufactured for use with Natural gas and must be converted using the proper LP conversion kit for use with LP (Propane) gas. For LP (Propane) gas, a tank regulator is required to reduce supply pressure to
A main manual shut off valve must be used in the gas piping. The shut off type and location must follow local codes and should always be in an accessible but protected location. In the absence of local codes the recommended methods for installing the gas piping to the furnace are shown in Figures
The gas valve contains two threaded ports for a 1/8" NPT tap in order to test incoming gas pressure and outgoing manifold pressure (See Figure 13).
Many soaps used for leak testing are corrosive to certain metals. Piping must be rinsed thoroughly with clean water after leak check has been completed.
Never use an open flame when testing for gas leaks! Use of an open flame could lead to a fire or explosion.
CONTROL BOARD & VARIABLE SPEED MOTOR FEATURES
Humidifier Connections:
Terminals are provided on the blower control board for connections to a
Electronic Air Cleaner Connections:
Terminals are provided on the blower control board for connection of a
Continuous Blower Operation:
The comfort level of the living space can be enhanced when using this feature by allowing continuous circulation of air between calls for cooling or heating. The circulation of air occurs at half the full cooling airflow rate.
To engage the continuous blower operation, place the fan switch on the thermostat into the ON position. A call for fan from the thermostat closes R to G on the ignition control board. The control waits for a 1 second thermostat debounce delay before responding to the call for fan by ramping the circulating blower up to 50% of the cooling speed, but not less than 425 cfm's. When the call for continuous fan is satisfied, the control immediately de- energizes the circulating blower.
Dehumidification:
For situations where humidity control is a problem, a dehumidification feature has been built into the variable speed motor. At the start of each cooling cycle, the variable speed motor will run at 82% of the rated airflow for 7.5 minutes. After 7.5 minutes has elapsed, the motor will increase to 100% of the rated airflow.
Additional dehumidification can be achieved by connecting a humidistat to the DEHUM and R terminals on the integrated ignition/blower control board. In this
setup, the variable speed motor will operate at a 10% reduction in the normal cooling airflow rate when there is a call for dehumidification.
Both dehumidification methods described above can be utilized on the same furnace.
Variable Speed Features:
The furnace is equipped with a variable speed circulation air blower motor that will deliver a constant airflow within a wide range of external static pressures.
Other features of this variable speed motor include:
Soft Start:
The variable speed motor will slowly ramp up to normal operating speed. This minimizes noise and increases comfort by eliminating the initial blasts of air encountered with standard motors.
Soft Stop:
At the end of a cooling or heating cycle, the variable speed motor will slowly ramp down after a short blower "off" delay. If continuous blower operation has been selected, the variable speed motor will slowly ramp down until it reaches the airflow for that mode.
Circulating Airflow Adjustments
Heating Mode:
The unit, as shipped, is factory set (setting "A") to run at the middle of the heating rise range as shown on the unit rating plate. Adjustments can be made to the heating airflow by repositioning the jumper plug marked
always be within the rise range shown on the rating plate.
20571201 | Issue 0527 | Page 17 of 28 |
