Thermo Products chx-3 75n, 100n, 125n operation manual Iii. General Installation

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

III. GENERAL INSTALLATION

These Category Type IV furnaces are shipped completely assembled and wired (internally). See the Dealer Receiving and Freight Claim Procedure Section of the price guide for parts shortage or damage. The furnace and duct system must be adjusted to obtain a temperature rise of 55°F to 85°F through the furnace after installation. (See rating label located on side panel inside the furnace vestibule). The installation must conform with local codes, or in the absence of local codes, with the National Fuel Gas Codes (ANSI Z223.1 or latest edition) and with these instructions.

: This furnace is not to be used for temporary heating of buildings or structures under construction.

Many of the chemicals used during construction, when burned, form acid bearing condensate that can substantially reduce the life of the heat exchanger.

It is recommended that a commercially available CO alarm be installed in conjunction with any fossil fuel burning appliance. The CO alarm shall be installed according to the alarm manufacturer’s installation instructions and be listed in accordance with latest edition of the UL Standard for Single and Multiple Station Carbon Monoxide Alarms, UL 2034, or the CSA International Standard, Residential Carbon Monoxide Alarming Devices, CSA 6.19.

A. CODES AND CLEARANCES

The following items must be considered when choosing the size and location of the furnace.

1.All local codes and/or regulations take precedence over the instructions in this manual and should be followed accordingly. In the absence of local codes, installation must conform with these instructions, regulations of the National Fire Protection Association, provisions of National Electrical Code (ANSI/NFPA70 or latest edition), and the National Fuel Gas Code (ANSI Z223.1 or latest edition).

2.The BTU output capacity of the furnace proposed for installation should be based on a heat loss calculation made according to the manuals provided by the Air Conditioning Contractors of America (ACCA) or ASHRAE.

3.MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS

TABLE 1

MODEL NO.	FROM SIDES OF	FRONT	TOP OF	FROM THE	SIDE OF
	FURNACE & REAR		PLENUM	FLUE OR VENT	PLENUM
CHX3-75	0 IN.	6 IN.	0 IN.	0 IN.	1 IN.
CHX3-100	0 IN.	6 IN.	0 IN.	0 IN.	1 IN.
CHX3-125	0 IN.	6 IN.	0 IN.	0 IN.	1 IN.
CDX3-75	0 IN.	6 IN.	0 IN.	0 IN.	1 IN.
CDX3-100	0 IN.	6 IN.	0 IN.	0 IN.	1 IN.
CDX3-125	0 IN.	6 IN.	0 IN.	0 IN.	1 IN.

The CHX3-75, 100 and 125 furnaces may be installed on combustible flooring. The furnace shall not be installed directly on carpeting, tile or other combustible material other than wood flooring.

The CDX3-75, 100 and 125 furnaces are to be installed on non-combustible flooring only. The non- combustible floor bases model no. 50 DA base for CDX3-75 model no. 100 CA base for the model no. CDX3-100 and model no. 125 CA base for CDX3-125 are available for the counterflow furnaces to allow their installations on combustible flooring.

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