Thermo Products CHX1-125N, CDX1-75N, CHX1-75N Use Of Non-Thermopride Filter Retention Means

All installations and services must be performed by qualified service personnel.

3. USE OF NON-THERMO PRIDE FILTER RETENTION MEANS

If a method other than the Thermo Pride filter rack is selected for retention of the filter and/or use of a different filter type is desired, see Table 3 for minimum size guidelines for selecting a filter system for the CHX1 or CDX1 furnaces.

MINIMUM FILTER AREA REQUIRED (LENGTH X WIDTH, SQ. IN.)

TABLE 3

FILTER TYPE	MAXIMUM	Required CFM / (Filter Velocity Rating x 144) = min. filter
	RATE	(in2)
	AIR VELOCITY
			FURNACE MODEL
		CHX1,CDX1-75	CHX1,CDX1-100	CHX1,CDX1-125
*THERMO	600 FT./MIN.	254 IN.2*	328 IN.2*	402 IN.2*
PRODUCTS
SUPPLIED
PERMANENT FILTER
STANDARD	500 FT./MIN.	304 IN.2	394 IN.2	484 IN.2
PERMANENT FILTER
DISPOSABLE TYPE	300 FT./MIN.	506 IN.2	656 IN.2	804 IN.2
FILTER

*The Thermo Products supplied filter can be cut to size to fit other filter retention systems as long as the minimum size requirement is met. NOTICE: Any internal stiffeners used in the filter must not be removed, although they can be cut to size as needed.

NOTICE: The filter areas in table 3 are the minimum areas required based on the CFM generated by the furnace for standard heating speeds only. The following formula can be used to determine the minimum filter area required for cooling if the unit is equipped with cooling. This value should then be compared to the value shown in table 3 and the larger of the two should then be used for determining the minimum filter area required for that installation.

FORMULA:
(tons of cooling) x (400 CFM per ton) (144 square inches per foot)	= filter area sq.inches
(max. air velocity of filter from table 3 for the filter type)	= length x width of
	filter in inches

EXAMPLE: If you had a CHX1-100 furnace and 4 tons of cooling and a standard permanent filter.

4 tons x 400 CFM x 144 = 460 square inches for cooling 500

For heating a CHX1-100 needs 394 square inches of filter. The filter system must be designed for the larger CFM requirement determined for cooling of 460 square inches. A filter would have to be sized so that the area (length X width) was at least 460 sq. in.

L. WIRING

All wiring shall be performed by a qualified electrician or service person. The wiring must comply with local codes, the instructions in this manual, and in the absence of codes with the National Electrical Code (ANSI/NFPA-70 or latest edition).

1. The following items are guidelines to complete the wiring portion of the installations.

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