Carrier 50QQ - Manual (Page 3)

I
I =\ = = = ^ 305 mm (12") TO 610 mm (24") (4) REQ
^ ----- —--------------------------------------------------------------------- '(411") (2) REQ
' I ---------------1 I 959mm (37|")(2)REQ
r 38 mm ( 1 - 5 ) 3 "
^ I--------------- ------- -| 959mm (375 )(l) REQ.
gj I I - |-^ 406 mm (16") ( 8 ) REQ
material :
ANGLE IR0N-3L8mm(l^) TO 38mm (1^) COMM'L STD
WELD FRAME TOGETHER
PAINT WITH ZINC-RICH PAINT (RUSTPROOF)
Fig. 3—Heat Pump Mounting Frame
#
When designing and installing ductwork, consider the
following:
1. When connecting ductwork to 042, 048 and 060 units,
do not drill deeper than one inch in shaded area shown
below. Coil may be damaged.
2 .
3.
4.
Install field-supplied filters in return air ductwork. Rec­
ommended sizes for filters are shown in Table 1.
Avoid abrupt duct size increases and reductions.
Abrupt change in duct size adversely affects air
performance.
Use flexible connectors between ductwork and unit to
prevent transmission of vibration. When electric heater
is installed, use fireproof canvas (or similar heat resis­
tant material) connector between ductwork and unit
discharge connection. If flexible duct is used, insert a
sheet metal sleeve inside duct. Heat resistant duct con­
nector (or sheet meted sleeve) must extend 24-in. from
electric heat element.
5. Size ductwork for cooling air quantity (cfm). The mini­
mum air quantity for proper electric heater operation is
listed below. Heater limit switches may trip at air
quantities below those recommended.
MODEL
50QQ
INDOOR FAN
SPEED SETTING
MIN CFM
018 675
024 875
030 875
036 Low 1400
042 1400
048 1700
060 1800
6. Insulate and weatherproof all external ductwork. Insu­
late and cover with a vapor barrier all ductwork pass­
ing through unconditioned spaces. Follow latest
SMACNA (Sheet Metal and Air Conditioning Contrac­
tors National Association) minimum installation stand­
ards for residential heating and air conditioning
systems.
7. Secure all ducts to building structure. Weatherproof
duct openings in wall or roof according to good con­
struction practices.