York GF9S*DH UIM-B-0607, Field Installed Accessories - Non-Electrical, Model No, Description

268890-UIM-B-0607

APPLYING FILTER PRESSURE DROP TO DETERMINE SYSTEM AIRFLOW

To determine the approximate airflow of the unit with a filter in place, fol- low the steps below:

1.Select the filter type.

2.Determine the External System Static Pressure (ESP) without the filter.

3.Select a filter pressure drop from the table based upon the number of return air openings or return air opening size and add to the ESP from Step 2 to determine the total system static.

4.If total system static matches a ESP value in the airflow table (i.e. 0.20, 0.60, etc,) the system airflow corresponds to the intersection of the ESP column and Model/Blower Speed row.

5.If the total system static falls between ESP values in the table (i.e. 0.58, 0.75, etc.), the static pressure may be rounded to the nearest value in the table determining the airflow using Step 4 or calculate the airflow by using the following example.

Example: For a 120,000 Btuh furnace operating on high speed blower, it is found that total system static is 0.58" w.c. To determine the system airflow, complete the following steps:

1.Obtain the airflow values at 0.50" & 0.60" ESP.

Airflow @ 0.50": 2152 CFM

Airflow @ 0.60": 2042 CFM

2.Subtract the airflow @ 0.50" from the airflow @ 0.60" to obtain air- flow difference.

2042 - 2152 = -110 CFM

3.Subtract the total system static from 0.50" and divide this differ- ence by the difference in ESP values in the table, 0.60" - 0.50", to obtain a percentage.

(0.58 - 0.50) / (0.60 - 0.50) = 0.8

4.Multiply percentage by airflow difference to obtain airflow reduc- tion.

(0.8) x (-110) = -88

5.Subract airflow reduction value to airflow @ 0.50" to obtain actual airflow @ 0.58" ESP.

2152 - 88 = 2064

	FIELD INSTALLED ACCESSORIES - NON-ELECTRICAL
MODEL NO.	DESCRIPTION	USED WITH
1NP0347	PROPANE (LP) CONVERSION KIT	ALL MODELS
1CT0302	CONCENTRIC INTAKE/VENT 2”	ALL MODELS EXCEPT 120 MBH
1CT0303	CONCENTRIC INTAKE/VENT 3”	ALL MODELS
1PS0904		40
1PS0901	HIGH ALTITUDE PRESSURE SWITCH KIT	60/100/120
	(Does Not Include Orifices)
1PS0902		80/1200
1PS0903		80/1600
1NK0301	CONDENSATE NEUTRALIZER KIT	ALL MODELS
1HT0901	SIDEWALL VENT TERMINATION KIT 3”	ALL MODELS
1HT0902	SIDEWALL VENT TERMINATION KIT 2”	ALL MODELS
1CB0314	COMBUSTIBLE FLOOR BASE	14-1/2” CABINET
	These kits are required in downflow application when using G*F*
1CB0317		17-1/2” CABINET
	series coils. These kits are not required with MC/FC series coils,
1CB0321		21” CABINET
	but please ensure that the coil and furnace are secured and that
1CB0324		24 1/2” CABINET
	there are noair leaks.
1TK0914		14-1/2” CABINET
1TK0917	COIL TRANSITION KIT	17-1/2” CABINET
1TK0921		21” CABINET
1TK0924		24 1/2” CABINET
1VK0901	3-WAY TRANSITION KIT	All MODELS

38 Unitary Products Group