Carrier 37HS specifications Air Series of Units with Different Capacities

Table 9 Ð Maximum Cfm Through the Inlet Collar

of a Single Unit or of Units in Air Series

	PLENUM	INLET	MAXIMUM TOTAL
		COLLAR
MODEL	SIZE		AIRFLOW
		DIAM
	(in.)		(Cfm)
		(in.)
	5 x 7	4	110
37HS1	7 x 7	6	400
	9 x 9	8	800
	11 x 11	10	1100
	7 x 7	6	400
37HS2	9 x 9	8	800
	11 x 11	10	1100
	9 x 9	8	800
37HS4	11 x 11	10	1100
	13 x 13	12	1600

In general, units in an air series should not be of mixed sizes (cfm capacities). If units of different capacities are used, a controller must be applied for each size unit. For example, an application for 800 cfm using different capacity units, as shown in Fig. 21, is acceptable only with multiple controls. This arrangement, although not preferred, can be used if care is taken to use the necessary controllers. In this case, 3 con- trollers are required. However, the best installation for an 800 cfm (nominal cfm total) would be one in which all the units are the same size. (Fig. 22.) In this case, a single con- troller can be used in the space.

Fig. 21 Ð Air Series of Units with Different Capacities

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