Blower Speed Selection, Additional Static Resistance

279550-YIM-A-0207

Table 15: Additional Static Resistance

Size	CFM	Wet Indoor Coil	Economizer1	Filter/Frame Kit	Electric Heat
(Tons)
	500	0.01	0.00	0.01	-
	600	0.01	0.00	0.02	-
	700	0.01	0.00	0.04	-
024	800	0.02	0.01	0.06	-
(2.0)	900	0.03	0.01	0.08	-
	1000	0.04	0.01	0.10	-
	1100	0.05	0.01	0.13	-
	1200	0.06	0.02	0.16	-
	700	0.01	0.00	0.04	-
	800	0.02	0.01	0.06	-
	900	0.03	0.01	0.08	-
036	1000	0.04	0.01	0.10	-
(3.0)	1100	0.05	0.01	0.13	-
	1200	0.06	0.02	0.16	-
	1300	0.07	0.03	0.17	-
	1400	0.08	0.04	0.18	-
	1100	0.02	0.02	0.04	-
	1200	0.03	0.02	0.04	-
	1300	0.04	0.02	0.05	-
	1400	0.05	0.03	0.05	-
048	1500	0.06	0.04	0.06	-
(4.0)	1600	0.07	0.04	0.07	-
	1700	0.07	0.04	0.08	-
	1800	0.08	0.04	0.09	-
	1900	0.09	0.05	0.10	-
	2000	0.09	0.05	0.11	-

1.The pressure drop through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.

Table 16: Indoor Blower Specifications

Size			Motor
(Tons)	HP	RPM	Eff.	SF	Frame
024	1/2	Variable	0.8	1.0	48
(2.0)

036	1	Variable	0.8	1.0	48
(3.0)

048	1	Variable	0.8	1.0	48
(4.0)

To Set Cooling CFM for DNX Units:

Refer to Airflow Performance Tables 13 and 14 for the possible cooling speed CFM selections.

Set “COOL” and “ADJ” Jumpers on the CFM selection board as indicated in Tables 13, 14 and Figure 14.

NOTE: CFM indicator light flashes once for every 100 CFM (i.e. 12 flashes = 1200 CFM).

Blower Speed Selection

The variable speed blowers are designed to deliver constant CFM regardless of the external static pressure (ESP) in the ductwork. Therefore, if too many supply registers are closed, a filter becomes clogged, or there is a restriction in the ductwork, the motor will automatically operate at a higher speed to compensate for the higher ESP. This may result in a higher operating sound level.

These units have variable speed motors that automatically adjust to provide constant CFM from 0.2" to 0.6" w.c. static pressure. From 0.6" to 1.0" static pressure, CFM is reduced by 2% per 0.1" increase in static. Operation on duct systems with greater than 1.0" w.c. external static pressure is not recommended.

Do not change the "ADJ" tab position on the CFM selection board as this will change your cooling CFM previously selected.

To Set Delay Profile:

Every unit has multiple cooling “blower off delay” profiles to optimize system performance and efficiency. Refer to Table 17 for the regional climate in your area. Place the “DELAY” jumper tap on the CFM selection board on the appropriate pin setting.

Factory Set Gas Heat CFM:

The blower speed required for gas heat is different than for cooling. The heating CFM is factory set, but is adjustable.

Unitary Products Group

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