Carrier 37HS specifications Ð Locate Units to Prevent Down-Drafts, Ð Air Throw Data Ð

EVALUATE THE THROW OF MODULINE UNITS IN POSSIBLE LOCATIONS Ð Check minimum throw for 2-way blow diffuser near walls and all one-way blow diffusers.

Exceeding maximum throw is almost never a problem. A 2-way blow unit covers 50 ft at nominal cfm.

In perimeter rooms, if 2-way blow units are off center, favor the exterior wall if possible.

Generally, one-way blow diffusers should blow away from the nearest wall.

Air throw data in Tables 4 and 5 for the Moduline air terminals provides the suggested minimum and maximum coverages the units can handle in a typical installation while maintaining the desired room conditions.

The optimum air throw values given in the table are dis- tances from the unit centerline to the outside wall or nearest obstruction (wall, light ®xture, or opposing air stream).

When given a choice, always put diffusers in line with each other, not blowing at each other. If diffusers must be placed so they are blowing at each other, the minimum throw must be checked. Do not put units closer together than minimum allows. Down-drafts caused by going below minimum will bother room occupants. (Fig. 16)

Moduline units can be placed fairly close to a wall or partition. This is because the down-draft follows the wall (stays close to the wall) and doesn't bother the room occu- pant. If furniture is placed against the wall near a Moduline unit, it causes the air to be de¯ected causing drafts. The prob- lem can often be solved by moving the furniture 6 in. or so away from the wall.

Fig. 16 Ð Locate Units to Prevent Down-Drafts

Table 4 Ð Air Throw Data Ð

1-Way and 2-Way Blow, 2-Slot Diffusers

37HS1 UNIT		OPTIMUM AIR THROW (ft)
AIRFLOW	1-Way Blow		2-Way Blow
(Cfm)
	Min	Max	Min	Max
40	2.0	7.0	2.0	5.0
50	4.0	9.0	3.0	6.0
60	7.5	12.0	3.5	7.5
70	8.0	15.0	4.0	9.0
80	9.0	18.0	4.5	10.5
90	10.0	20.0	5.0	11.5
100	11.0	22.0	6.0	13.0
110	12.0	24.0	7.0	15.0
37HS2 UNIT		OPTIMUM AIR THROW (ft)
AIRFLOW	1-Way Blow		2-Way Blow
(Cfm)
	Min	Max	Min	Max
80	2.0	7.0	2.0	5.0
100	4.0	9.0	3.0	6.0
120	7.5	12.0	3.5	7.5
140	8.0	15.0	4.0	9.0
160	9.0	18.0	4.5	10.5
180	10.0	20.0	5.0	11.5
200	11.0	22.0	6.0	13.0
220	12.0	24.0	7.0	15.0
37HS4 UNIT		OPTIMUM AIR THROW (ft)
AIRFLOW	1-Way Blow		2-Way Blow
(Cfm)
	Min	Max	Min	Max
160	8.5	16.0	5.0	7.0
200	10.0	20.0	6.0	10.0
250	11.0	21.0	7.0	13.0
300	12.0	22.0	8.0	17.0
350	14.0	23.0	9.0	19.0
400	15.0	25.0	10.0	21.0
440	17.0	29.0	13.0	24.0

Table 5 Ð Air Throw Data Ð

2-Way and 1-Way Director, 3-Slot Diffusers

37HS1 UNIT			OPTIMUM AIR THROW (ft)
		Heating			Cooling
AIRFLOW
	1-Way Blow				2-Way Blow
(Cfm)
	Min			Max	Min	Max
40	2.0		7.0		2.0	5.0
50	4.0		9.0		3.0	6.0
60	7.5		12.0		3.5	7.5
70	8.0		15.0		4.0	9.0
80	9.0		18.0		4.5	10.5
90	10.0		20.0		5.0	11.5
100	11.0		22.0		6.0	13.0
110	12.0		24.0		7.0	15.0
37HS2 UNIT			OPTIMUM AIR THROW (ft)
		Heating			Cooling
AIRFLOW
	1-Way Blow				2-Way Blow
(Cfm)
	Min			Max	Min	Max
80	2.0			7.0	2.0	5.0
100	4.0			9.0	3.0	6.0
120	7.5			12.0	3.5	7.5
140	8.0			15.0	4.0	9.0
160	9.0			18.0	4.5	10.5
180	10.0			20.0	5.0	11.5
200	11.0			22.0	6.0	13.0
220	12.0			24.0	7.0	15.0
37HS4 UNIT			OPTIMUM AIR THROW (ft)
		Heating			Cooling
AIRFLOW
(Cfm)	1-Way Blow				2-Way Blow
	Min			Max	Min	Max
160	8.5		16.0		5.0	7.0
200	10.0		20.0		6.0	10.0
250	11.0		21.0		7.0	13.0
300	12.0		22.0		8.0	17.0
350	14.0		23.0		9.0	19.0
400	15.0		25.0		10.0	21.0
440	17.0		29.0		13.0	24.0

NOTES:

1.Minimum air throw refers to the distance from the diffuser where the air ve- locity is 150 fpm. In maximum air throw, this velocity has dropped to 50 rpm.

2.Data is based on an area with a 9-ft ceiling. For higher ceilings, values may be reduced by one foot for each foot of height increase. For speci®c instal- lations, minimum values can be reduced if properly quali®ed. Values are dependent on cfm only and are not affected by duct pressure.

26