Monoport Burners | Carrier 48SX024-060, 48SS018-060 manual

Measure Manifold Pressure (Propane Units) Ð The main burner ori®ces on a propane gas unit are sized for the unit rated input when the manifold pressure reading matches the level speci®ed in Table 5.

Proceed as follows to adjust gas input on a propane gas unit:

1.Turn off gas to unit.

2.Remove pipe plug on manifold (see Fig. 24), then con- nect manometer at this point.

3.Turn on gas to unit.

4.Remove cover screw over regulator adjustment screw on gas valve.

5.Adjust regulator adjustment screw to the correct mani- fold pressure, as speci®ed in Table 5. Turn adjusting screw clockwise to increase manifold pressure, or turn adjusting screw counterclockwise to decrease manifold pressure.

6.Replace cover screw.

7.Turn off gas to unit. Remove manometer from pressure tap. Replace pipe plug on gas valve, then turn on gas to unit. Check for leaks.

CHECK BURNER FLAME Ð With burner access panel re- moved, observe the unit heating operation. Watch the burner ¯ames to see if they are light blue and soft in appearance, and that the ¯ames are approximately the same for each burner. Propane will have blue ¯ame with yellow tips. See Fig. 25. Refer to Maintenance section for information on burner removal.

Fig. 25 Ð Monoport Burners

AIRFLOW AND TEMPERATURE RISE Ð The heating sec- tion for each size unit is designed and approved for heating operation within the temperature-rise range stamped on the unit rating plate.

Table 6 shows the approved temperature-rise range for each heating input, and the air delivery cfm at various tempera- ture rises. The heating operation air¯ow must produce a tem- perature rise that falls within the approved range.

Refer to Evaporator Air¯ow and Air¯ow Adjustments sec- tion on page 35 to adjust heating air¯ow when required.

Table 6 Ð Air Delivery (Cfm) at Indicated Temperature Rise and Rated Heating Input

HEATING							TEMPERATURE RISE °F
INPUT
(Btuh)	20	25	30	35	40	45	50	55	60	65	70		75	80	85	90
40,000	1389	1111	926	794	694	617	556	Ð	Ð	Ð	Ð	Ð	Ð	Ð	Ð
56,000	2083	1667	1389	1190	1042	926	833	758	Ð	Ð	Ð	Ð	Ð	Ð	Ð
80,000	2778	2222	1852	1587	1389	1235	1111	1010	926	855	794		Ð	Ð	Ð	Ð
95,000	3472	2778	2315	1984	1736	1543	1389	1263	1157	1068	992		926	868	Ð	Ð
120,000	4167	3333	2778	2381	2083	1852	1667	1515	1389	1282	1190		1111	1042	980	926
136,000	5037	4029	3358	2878	2518	2238	2014	1831	1679	1549	1439		1343	1259	1185	1119

NOTE: Dashed areas do not fall within the approved temperature rise range of the unit.

Fig. 25 Ð Monoport Burners

HEATING

TEMPERATURE RISE °F

INPUT