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37
APPLICATION DATA
Min operating ambient temp (cooling):
In mechanical cooling mode, your Carrier rooftop can
safely operate down to an outdoor ambient temperature of
25
_
F (--4
_
C). It is possible to provide cooling at lower
outdoor ambient temperatures by using less outside air,
economizers, and/or accessory low ambient kits.
Max operating ambient temp (cooling):
The maximum operating ambient temperature for cooling
mode is 115
_
F (46
_
C). While cooling operation above
115
_
F (46
_
C) may be possible, it could cause either a
reduction in performance, reliability, or a protective action
by the unit’s internal safety devices.
Min and max airflow (cooling mode):
To maintain safe and reliable operation of your rooftop,
operate within the cooling airflow limits. Operating above
the max may cause blow--off, undesired airflow noise, or
airflow related problems with the rooftop unit. Operating
below the min may cause problems with coil freeze--up.
Airflow:
All units are draw--though in cooling mode.
Outdoor air application strategies:
Economizers reduce operating expenses and compressor
run time by providing a free source of cooling and a
means of ventilation to match application changing needs.
In fact, they should be considered for most applications.
Also, consider the various economizer control methods
and their benefits, as well as sensors required to
accomplish your application goals. Please contact your
local Carrier representative for assistance.
Motor limits, Brake horsepower (BHP):
Due to Carrier’s internal unit design, air path, and
specially designed motors, the full horsepower (maximum
continuous BHP) band, as listed in this manual, can be
used with the utmost confidence. There is no need for
extra safety factors, as Carrier’s motors are designed and
rigorously tested to use the entire, listed BHP range
without either nuisance tripping or premature motor
failure.
Sizing a rooftop
Bigger isn’t necessarily better. While an air conditioner
needs to have enough capacity to meet the load, it doesn’t
need excess capacity. In fact, having excess capacity
typically results in very poor part load performance and
humidity control.
Using higher design temperatures than ASHRAE
recommends for your location, adding “safety factors” to
the calculated load, and rounding up to the next largest
unit, are all signs of oversizing air conditioners.
Oversizing can cause short--cycling, and short cycling
leads to poor humidity control, reduced efficiency, higher
utility bills, drastic indoor temperature swings, excessive
noise, and increased wear and tear on the air conditioner.
Rather than oversizing an air conditioner, wise contractors
and engineers “right--size” or even slightly undersize air
conditioners. Correctly sizing an air conditioner controls
humidity better; promotes efficiency; reduces utility bills;
extends equipment life, and maintains even, comfortable
temperatures.
Low ambient applications
When equipped with a Carrier economizer, your rooftop
unit can cool your space by bringing in fresh, cool outside
air. In fact, when so equipped, accessory low ambient kit
may not be necessary. In low ambient conditions, unless
the outdoor air is excessively humid or contaminated,
economizer--based “free cooling” is the preferred less
costly and energy conscious method.
In low ambient applications where outside air might not
be desired (such as contaminated or excessively humid
outdoor environments), your Carrier rooftop can operate
at ambient temperatures down to --20
_
F (--29
_
C) using the
recommended accessory Motormaster low ambient
controller.
50TC
Q
Summary of Contents for WeatherMaker 50TCQ*07
Page 21: ...21 WEIGHTS DIMENSIONS C09016 Fig 1 Dimensions 50TCQ 04 07 50TCQ ...
Page 24: ...24 WEIGHTS DIMENSIONS cont C08677B Fig 5 Dimensions 50TCQ 08 09 50TCQ ...
Page 25: ...25 WEIGHTS DIMENSIONS cont C10393 Fig 6 Dimensions 50TCQ 08 09 50TCQ ...
Page 27: ...27 WEIGHTS DIMENSIONS cont C10369 Fig 9 Curb Dimensions 50TCQ 08 09 50TCQ ...
Page 28: ...28 WEIGHTS DIMENSIONS cont C09556A Fig 10 Dimensions 50TCQ 12 50TCQ ...
Page 31: ...31 WEIGHTS DIMENSIONS cont C10370 Fig 14 Curb Dimensions 50TCQ 12 50TCQ ...
Page 32: ...32 WEIGHTS DIMENSIONS cont C09895A Fig 15 Dimensions 50TCQ 14 50TCQ ...
Page 33: ...33 WEIGHTS DIMENSIONS cont C09895A Fig 16 Dimensions 50TCQ 14 50TCQ ...
Page 35: ...35 WEIGHTS DIMENSIONS cont C10251 Fig 19 Curb Dimensions 50TCQ 14 50TCQ ...
Page 87: ...87 TYPICAL WIRING DIAGRAMS C09063 Fig 28 1 Stage Cooling Typical Power Diagram 50TCQ ...
Page 88: ...88 TYPICAL WIRING DIAGRAMS cont C09065 Fig 29 2 Stage Cooling Typical Power Diagram 50TCQ ...
Page 89: ...89 TYPICAL WIRING DIAGRAMS cont C09066 Fig 30 PremierLink Option Diagram 50TCQ ...
Page 90: ...90 TYPICAL WIRING DIAGRAMS cont C09067 Fig 31 Multi Protocol Option Diagram 50TCQ ...
Page 91: ...91 C09062 Fig 32 1 Stage Typical Wiring Diagram 50TCQ ...
Page 92: ...92 C09064 Fig 33 2 Stage Typical Wiring Diagram 50TCQ ...