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A minimum of twelve inch elevation is recommended, while greater elevation may be required for areas of high snow accumulation. Poured concrete, steel framework, brick, cement block, etc., can be utilized to construct a suitable raised mounting platform. See Figure 6. DUCT WORK Refer to Tables 4, 5 and 5A when designing duct work for maximum static pressure available with the specific model and heater package being installed. Unit duct work is suitable for 0” clearance to combustible materials. TYPICAL INSTALLATIONS 1. ROOF MOUNTED – The unit is mounted on a sturdy base on the roof of the building. Return air to the unit is brought through a single return grille (grilles with built-in filters are best since they enable easy access for filter changing). Return air ducts are attached to the lower section of the front panel. Supply air is brought from the unit to attic duct work or to a furred down hall. Supply air duct is attached to the top of the front panel. CAUTION: All outdoor duct work must be thoroughly insulated and weatherproofed. All attic duct work must be thoroughly insulated. Two inch thick insulation with suitable vapor barrier is recommended for both outdoor and attic runs. In roof top installation, as in all installations, the heat pump must be level from side to side. However, the unit should have a pitch along the length to assure complete external drainage of precipitation and of defrost condensate. 2. CRAWL SPACE – Duct work installed in crawl space must be well insulated and provided with a vapor barrier. In addition, the crawl space must be thoroughly ventilated and provided with a good vapor barrier as a ground cover. It is most desirable to install the unit outdoors rather than inside the crawl space, so that it will be readily accessible for service. In addition, it is necessary to dispose of the condensate from the outdoor coil on the heating cycle, and this is virtually impossible with the unit installed inside the crawl space. 3. SLAB MOUNTED AT GROUND LEVEL – This type installation is ideal for homes with a slab floor construction where a roof mounted unit is not desired. The supply and return duct work can be run through a furred closet space. 4. THROUGH THE WALL – This type installation requires a suitable framework to be fabricated capable of withstanding the unit weight. Normally the unit will be insulated so as to minimize supply and return duct work. 5. OTHER INSTALLATIONS – Many other installations are possible with the packaged heat pump. No matter what the installation, always consider the following facts: A. Insure that the discharge air is not obstructed in any way so as to cause operation difficulties. B. The indoor coil drain pan is equipped with a coupling that must be piped through a condensate drain trap to a suitable drain. C. Always mount the unit is such a position that it may be easily reached for servicing and maintenance. D. Insure that the unit is clear so that proper air flow over the outdoor coil will be maintained. If this unit is operated in cooling below a 65° outdoor ambient temperature, the installation of low ambient controls (CMA-6) to unit is required. Manual 2100-344 Page 5 Manual 2100-344 Page 6 FIGURE 3 ELEVATED MOUNTING PLATFORMS MIS-1183 MIS-1185 FIGURE 4 AIRFLOW and SERVICE ACCESS CLEARANCES Manual 2100-344 Page 7 FIGURE 5 ROOF TOP APPLICATION (May also be required for ground level installations.) MIS-1176 FIGURE 6 SLAB MOUNTING AT GROUND LEVEL (Above 32° F Outside Temperature) MIS-1184 CONDENSATE DRAIN TRAP It is very important to provide a trap in the condensate drain line to allow a positive liquid seal in the line and assure correct drainage from the coil condensate pan. Install condensate drain trap shown in Figure 7. Use drain connection size or larger. Do not operate unit without trap. Unit must be level or slightly inclined toward drain. With a trap installed on a unit located in an unconditioned area, water in the trap may freeze. It is recommended that the trap material be of a type that will allow for expansion of water when it freezes. AIR FILTERS Air filters for the return air side of the system are not provided as part of the various types of applications for these models, and must be field supplied and installed as part of the final installation. Prior thought should be given to return air location and placement of the air filter(s). The air filter(s) must be of adequate size and readily accessible to the operator of the equipment. Filters must be adequate in size and properly maintained for proper operation. If this is not done, excessive energy use, poor performance, and multiple service problems will result. It is impossible to oversize air filters. Generous sizing will result in cleaner air and coils as well as lower operating costs and extend the time between required changes. Table 6 shows minimum filter areas and recommended filter sizes. Actual filter sizes can vary with the installation due to single or multiple return...
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