Raypak 399B-2339B operating instructions Horizontal Through-the-WallVenting Category

speed. Do not operate summer exhaust fan. Close fireplace dampers.

4.Place in operation the appliances being inspected. Follow the manufacturer’s instructions for lighting each appliance. Adjust thermostat so appliance will operate continuously.

5.Check the pressure at a pressure tap located 12 in. above the bottom joint of the first vertical vent pipe. Pressure should be anywhere between -0.01 and -0.08 in. WC.

6.After it has been determined that each appliance remaining connected to the common venting sys- tem properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and other gas burning appliances to their previous conditions of use.

7.Any improper operation of the common venting system should be corrected so that the installation conforms with the NFGC (U.S.) or B149 (Canada). When re-sizing any portion of the common venting system, the common venting system should be re- sized to approach the minimum size as determined using the appropriate tables in the NFGC (U.S.) or B149 (Canada).

Horizontal Through-the-Wall Venting (Category III)

Installation

These installations utilize the heater-mounted blower to vent the combustion products to the outdoors. Combustion air is taken from inside the room and the vent is installed horizontally through the wall to the out- doors. Adequate combustion and ventilation air must be supplied to the equipment room in accordance with the NFGC (U.S.) or B149 (Canada).

The total length of the horizontal through-the-wall flue system should not exceed 70 equivalent ft in length. If horizontal run exceeds 70 equivalent ft, an appropri- ately sized extractor must be used. Each elbow used is equal to 10 ft of straight pipe. This will allow installa- tion in one of the four following arrangements:

•70’ of straight flue pipe

•60’ of straight flue pipe and one elbow

•50’ of straight flue pipe and two elbows

•40’ of straight pipe and three elbows

The vent cap is not considered in the overall length of the venting system.

*

*Requires optional vent tee.

Fig. 26: Horizontal Through-the-Wall Venting (Category III)

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