Carrier 50YQ - Manual (Page 3)

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F¡g. 3 — Heat Pump Mounting Frame
Flanges are provided on unit for rectangular duct
connections. Figure 4 shows a typical duct system
with 50YQ installed. Do not operate unit longer
than 5 minutes without ductwork. If necessary, refer
to Carrier System Design Manual, Part 2, for sys­
tem air duct design. When designing and installing
ductwork, consider the following:
a. When connecting ductwork to unit, do not drill
holes in area shown below. Coil may be damaged.
b. Install field-supplied filters in return air duct­
work. Recommended sizes for filters are shown
in Table I.
c. Avoid abrupt duct size increases and reductions.
■d. Use flexible connectors between ductwork and
unit to prevent transmission of vibration. When
electric heater is installed, use fireproof canvas
e.
(or similar heat resistant material) connector be­
tween ductwork and unit discharge connection.
If flexible duct is used, insert a sheetmetal sleeve
inside duct. Design this connector or sleeve so
that it extends 24 in. from electric heater element.
Size ductwork for cooling air quantity (cfm). The
minimum air quantity for proper heating/ cooling
operation and electric heater operation is 400 cfm
per ARI cooling ton as listed below:
UNIT 50YQ MIN CFM
024 8 3 3
030 1 0 0 0
036 1 1 8 3
042 1 3 6 6
048 1 6 3 3
060 1 9 3 3
Heater limit switches may trip at air quantities
below those recommended.
Insulate and make weatherproof all external
ductwork. Insulate and cover with a vapor
barrier all ductwork passing thru unconditioned
spaces. Follow latest SMACNA (Sheet Metal
and
Air Conditioning Contractors National
Association) and NESCA (National Environ­
mental Systems Contractors Association) mini­
mum installation standards for residential heat­
ing and air conditioning systems.