5.Make sure that blower speed taps are set for proper heating and cooling. Refer to Section 18, "Adjusting Blower Speed." Heating speed should be set according to Table 9. Cooling speed should be set to meet cooling equipment requirements. See Table 10 for cooling airflow capacities at 0.5 inch W.C.
6.Place slope gauge near furnace, level and adjust scale to read 0.00 inches W.C.
7.Insert one static pressure tap into
8.Insert other static pressure tap in return air plenum. Connect this pressure tap to negative pressure side of slope gauge.
9.Start blower.
??Blower heating speed can be run by jumping terminals "R" and "G" on
??Blower cooling speed can be run by jumping terminals "R" and "Y" on
NOTE: On cooling speed, there is a short
stops.
10. Read duct system static pressure from slope gauge.
NOTE: If air filter location is upstream of
Duct System | = Measured - 0.08 inches W.C. |
Static Pressure | Pressure |
11.Remove jumper wire from
SECTION 20. MEASURING AIR TEMPERATURE RISE
You will need 2 thermometers with
Air temperature rise (supply air temperature minus return air temperature) must be within allowable
rise range specified on furnace rating plate and in Table 9.
Follow this procedure:
1.Open supply air registers and return air grilles. Make sure registers and grilles are free of obstruction from rugs, carpets, drapes or furniture.
2.Set balancing dampers in supply duct system.
3.Check ductwork for obstructions or leaks.
4.Make sure filters are clean and in place.
5.Make sure that blower speed taps are set for proper heating and cooling. Refer to Section 18, "Adjusting Blower Speed." Heating speed should be set according to Table 9. Cooling speed should be set to
meet cooling equipment requirements. See Table 10 for cooling airflow capacities at 0.5 inch W.C.
6.Place one thermometer in supply air plenum
approximately 2 feet from furnace. Locate thermometer tip in center of plenum to ensure proper temperature measurement.
7.Place second thermometer in
approximately 2 feet from furnace. Locate thermometer tip in center of duct to ensure proper temperature measurement.
8.Set room thermostat on highest temperature setting. Operate furnace 6 minutes . Record supply air and return air temperatures.
9.Calculate air temperature rise by subtracting return air temperature from supply air temperature.
??If air temperature rise is above temperature rise range specified in Table 9, furnace is overfired or has insufficient airflow. Check gas input following the instructions in Section 14, "Checking Gas Input Rate." If air temperature rise is still above temperature rise range specified, more heating airflow is needed. Change blower heating speed to a higher setting following instructions in Section 18, "Adjusting Blower Speed."
??If air temperature rise is below temperature rise range specified in Table 9, furnace is underfired or has too much airflow. Check gas input following the instructions in Section 14, "Checking Gas Input Rate." If air temperature rise is still below temperature rise range specified, less heating airflow is needed. Change blower heating speed to a lower setting following instructions in Section 18, "Adjusting Blower Speed."
??After making adjustments, you must check air temperature rise to verify that resulting air temperature rise is within allowable range. If air temperature rise is still outside temperature rise range specified in Table 9, check duct system design with a qualified heating engineer. It may be necessary to
10.Set room thermostat to desired setting.
11.Remove thermometers and seal ductwork holes.
SECTION 21. CHECKING
CONTROLS
Before leaving work site, check to see that all controls are functioning properly.
You will need a 0 to 15 inch water manometer with 0.1 inch resolution and a 1/8" NPT manual
Follow this procedure:
1.Turn off electricity at electrical disconnect switch next to furnace.
2.Remove three screws holding burner access panel in place. Remove burner access panel.
3.Turn gas control switch to OFF position.
Installer’s Information Manual | Page 25 |
