Assessments - 3, GPA: 4.3
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Re-tighten set screws and replace the outer side panels. 3 Heater Parts from ACF Greenhouses The PD 350 and PD 400 have four mounting holes. On all blower units, except the PD 350 and PD 400, two tapped holes are provided in the top of the unit and two holes in the blower support bracket. The PD 350 and PD 400 have four tapped holes in the top of the unit and two in the blower support bracket for mounting. To assure that flames are directed into the center of heat exchanger tubes, unit must be supported in a vertical position, with suspension hangers “UP.” Check with a level. This is important to the operation and life of unit. NOTE: Pipe hanger adapter kits, are available as accessories from Modine. The hardware allows for pipe caps to be secured into the top of the unit heater with machine screws (machine screws are 3/8 - 16 x 1.75 UNC-2A THD). The pipe caps can then accommodate 3/4" NPT pipe for mounting. NOTE: A vent is the vertical passageway used to convey flue gases from the unit or the flue collar to the outside atmosphere. A flue collar is the pipe which connects the unit to a vent or chimney. Venting Instructions 1. All units with single-stage controls are Category I. 2. All units with two-stage or modulating controls are Category II. The installation of a Category II unit must conform to the requirements from Table 1 in addition to those listed below. 3. Select size of vent pipe to fit vent pipe connection at rear of appliance (see Page 12 and 13, Dimension J). Do not use a vent pipe smaller than the vent pipe connection on the unit. Vent pipe should be galvanized steel or other suitable corrosion-resistant material. Follow the National Fuel Gas Code for minimum thicknesses of vent material; minimum thicknesses for flue collars vary depending on pipe diameter. 4. Limit length of horizontal runs to 75% of vertical height. Install with a minimum upward slope from unit of 1/4 inch per foot and suspend securely from overhead structure at points no greater than 3 feet apart. For best venting, put as much vertical vent as close to the unit as possible. Fasten individual lengths of vent together with at least three corrosion-resistant sheet-metal screws. 5. Avoid venting through unheated space when possible.When venting does pass through an unheated space, Modine recommends the use of Type B double wall vent. If single wall vent is used, insulate vent runs greater than 5 feet to minimize condensation. Use insulation that is noncombustible with a rating of not less than 350°F. Install a tee fitting at the low point of the vent system to provide a drip leg with a clean out cap as shown in Figure 3. The drip leg should be cleaned annually. 6. Keep single wall vent pipe at least 6 inches from combustible material. For double wall vent pipe, maintain clearances listed on vent pipe (Category I and II units) (see page 2, section 12 for allowable reductions). The minimum distance from combustible material is based on the combustible material surface not exceeding 160°F. Clearance from the vent connector, vent, or top of unit may be required to be greater than the minimum clearance if heat damage other than fire (such as material distortion or discoloration) may occur. 7. Where the vent passes through a combustible floor or roof, a metal thimble 4 inches greater than the vent diameter is necessary. If there is 6 feet or more of vent pipe in the open space between the unit and where the vent pipe passes through the floor or roof, the thimble need only be 2 inches greater than the diameter of the vent pipe. If a thimble is not used, all combustible material must be cut away to provide the specified clearance to combustibles. Any material used to close the opening must be noncombustible. 8. Top of vertical vent should extend at least two feet above the highest point where it passes through a roof and at least 2 feet higher than any portion of a building within a horizontal distance of 10 feet (see Figure 3). 9. Use a vent terminal to reduce downdrafts and moisture in vent. A vent terminal that is very open will avoid spillage at unit’s diverter relief opening and tripping of the blocked vent safety switch. 10.Check vent system to see that combustion products are being vented properly. Operate unit for several minutes and then pass a lighted match around the edge of the diverter relief opening. If the flame is drawn into the opening, the vent system is drawing properly. If not, make adjustments to provide adequate draft (see page 21). 11.A drip leg with cleanout cap is recomended for all vent systems to reduce the opportunity of damage to unit due to condensation. ADDITIONAL VENTING REQUIREMENTS FOR CATEGORY II UNITS Vent system must provide for drainage of condensate. At the low point of the vent system, install a tee fitting with a connector and attach flexible tubing, minimum 3/8 inch I.D., and run to a drain. Tee fitting and associated condensate disposal system must be periodically cleaned. 4 INSTALLATION CAUTI...
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Aquecedores a gás - GAS-FIRED HEATERS BD (3 mb)
Aquecedores a gás - GAS-FIRED HEATERS PD (3 mb)