When designing and installing ductwork, consider the following:
!CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to unit components.
When connecting ductwork to units, do not drill deeper than 3/4 in. (19 mm) in shaded area shown in Fig. 2 or coil may be damaged.
19.17 in. (487 mm) | 3.92 in. |
(100 mm)
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Fig. 2 - Area Not to be Drilled More Than
Deep
1.All units should have
2.Avoid abrupt duct size increases and reductions. Abrupt change in duct size adversely affects air performance.
IMPORTANT: Use flexible connectors between ductwork and unit to prevent transmission of vibration. Use suitable gaskets to ensure weather tight and airtight seal. When electric heat is installed, use fireproof canvas (or similar heat resistant material) connector between ductwork and unit discharge connection. If flexible duct is used, insert a sheet metal sleeve inside duct. Heat resistant duct connector (or sheet metal sleeve) must extend
3.Size ductwork for cooling air quantity (cfm). The minimum air quantity for proper electric heater operation is listed in Table 2. Heater limit switches may trip at air quantities below those recommended.
4.Seal, insulate, and weatherproof all external ductwork. Seal, insulate and cover with a vapor barrier all ductwork passing through conditioned spaces. Follow latest Sheet Metal and Air Conditioning Contractors National Association (SMACNA) and Air Conditioning Contractors Association (ACCA) minimum installation standards for residential heating and air conditioning systems.
5.Secure all ducts to building structure. Flash, weatherproof, and
Fig. 6 shows a typical duct system with 664B unit installed.
CONFIGURING UNITS FOR DOWNFLOW (VERTICAL) DISCHARGE
! | WARNING |
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ELECTRICAL SHOCK HAZARD |
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Failure to follow this warning could result in personal |
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injury or death. |
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Before performing service or maintenance operations on the |
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system, turn off main power to unit and install lockout tag. |
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Units are dedicated side supply products. They are not convertible |
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to vertical air supply. A |
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convert to vertical air discharge. |
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Step 6 — Connect Condensate Drain |
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NOTE: When installing condensate drain connection be sure to |
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comply with local codes and restrictions. |
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Unit removes condensate through a | 664B | |||
(using | ||||
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the end of the unit. See Fig. 5 for location of condensate |
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connection. |
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Condensate water can be drained directly onto the roof in rooftop |
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installations (where permitted) or onto a gravel apron in ground |
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level installations. Install a |
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condensate connection to ensure proper drainage. Make sure that |
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the outlet of the trap is at least 1 in. (25 mm) lower than the drain |
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pan condensate connection to prevent the pan from overflowing |
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(See Fig. 3 and 4). When using a gravel apron, make sure it slopes |
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away from the unit. |
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If the installation requires draining the condensate water away from |
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the unit, install a |
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tubing or pipe. (See Fig. 3 and 4.) Make sure that the outlet of the |
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trap is at least 1 in. (25 mm) lower than the unit |
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condensate connection to prevent the pan from overflowing. Prime |
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the trap with water. Connect a drain tube using a minimum of |
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pipe (all field supplied). Do not undersize the tube. Pitch the drain |
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tube downward at a slope of at least 1 in. (25 mm) for every 10 ft |
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(3 m) of horizontal run. Be sure to check the drain tube for leaks. |
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Prime trap at the beginning of the cooling season |
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Allowable glues for condensate trap connection are: Standard |
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ABS, CPVC, or PVC cement.. |
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1” (25 mm) MIN.
TRAP
OUTLET
2” (51 mm) MIN.
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Fig. 3 - Condensate Trap
TRAP
OUTLET
1" (25 mm) MIN.
2" (51 mm) MIN.
Fig. 4 - PVC Condensate Trap
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