Raypak 399B-2339B Operations Instructions download pdf (Page 30)

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).

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

*Requires optional vent tee.

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.

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).

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Raypak 399B-2339B Operations Instructions Page 30

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