38 MAQ Datasheet

10
APPLICATION DATA
UNIT SELECTION
Select equipment to either match or be slightly less than anticipated
peak load. This provides better humidity control, fewer unit cycles,
and less part- load operation.
For units used in spaces with high sensible loads, base equipment
selection on unit se nsibl e loa d, not on total ant icipated loa d. Adjus t for
anticipated room wet bulb tempe rature to avoid undersizing
equipme nt.
UNIT MOUNTING (INDOOR)
Refer to unit Installation Instructions for further details.
Unit leveling - For reliable operation, units should be level in all
planes.
Clearance - Provide adequate clearance for airflow (see Fig. 2.)
Unit location - Select a location which will provide the best air
circulation for the room. These units should be positioned as high
as possible on the wall for best air circulation. The unit return and
discharge should not be obstructed by furniture, curtains, or
anything which may cause unit short cycling or air recirculation.
Place the unit in the middle of the selected wall (if possible). Use
an outside wall, if available, to make piping easier, and place the
unit so it faces the normal location of room occupants.
UNIT MOUNTING (OUTDOOR)
Refer to unit Installation Instructions for further details.
Unit leveling - For reliable operation, units should be level in all
planes.
Clearance - Minimum clearance (see Fig. 5) must be provided
for airflow. The condensing units are designed for free-flow
application. Air inlets and outlets should not be restricted.
Unit location - A location which is convenient to installation and
not exposed to strong wind. A location that can bear the weight of
outdoor unit and where the outdoor unit can be mounted in a level
position.
Do not install the indoor or outdoor units in a location with special
environmental conditions. For those applications, contact your
Carrier representative.
MOUNTING TEMPLATE
Refer to unit Installation Instructions for further details.
The fan coil units are furnished with mounting to mark the location
of the wiring, and refrigeration line hole locations.
SUPPORT
Ade quate support must be pr ovi ded t o support the weight of a ll fan
coils. Refer to the Physical Data section for fan coil weights, and the
base unit dime nsional drawings for the loc ation of mounti ng brackets.
SYSTEM OPERATING CONDITIONS
Operating Range
Min / Max °F (°C)
Cooling Heating
Outdoor DB 4 / 122 (-20 / 50) 4 / 86 (-20 / 30)
Indoor DB 63 / 90 (17 / 32) 32 / 86 (0 / 30)
Indoor WB 59 / 84 (15 / 29)
Non-Operating Temperature Range
Min / Max °F (°C)
Indoor/Outdoor DB 32 / 86 (0 / 30)
NOTE: Ref erence the Produc t Install ation Instructions for more
information.
METERING DEVICES
The outdoor unit (Sizes 09 - 18) has an electronic expansion valve
to manage the refrigerant flow of the fan coil connected.
Sizes 24 and 30 have capillary tube metering devices in the
outdoor unit.
DRAIN CONNECTIONS
Install drains to meet local sanitation codes. If adequate gravity
drainage cannot be provided, unit should be equipped with
accessory condensate pump. High wall fan coil unit condensate
pumps have a maximum lift of 10’ (3.05 m) for 9k and 12k units
and 25’ (7.62 m) for 18k and 30k units.
See physical dimension tables for drain sizes.
NOTE: High wall fan coil units have internal condensate traps.
A tra p is not required.
Drain connections may be routed through alternate locations on
most fan coils (see Fig. 4).
Pipe holder
Pipe cover
Right piping
Left piping
Pipe cover
Right back piping
Left back piping
1
2
3
4
Fig. 6 – Piping Locations
REFRIGERANT LINES
General refrigerant line sizing:
1. The 38MAQ units ar e shi pped with a ful l cha rge of R410A
refrigerant. All charges, line sizing, and capacities are based on
runs of 25 ft (7.6 m). For runs over 25 ft (7. 6 m), cons ult
long- l ine section on this page for proper charge adjustments.
2. Re fri gerant lines shoul d not be buri ed in the gr ound. If it is
necessary to bur y t he li nes, not more tha n 36- in (914 mm)
should be buried. Provi de a minimum 6- in (152 mm) ver tical
rise to the service valves to pre ve nt re frigerant migr ation.
3. Both lines must be insulated. Use a minimum of 1/2- in.
(12.7 mm) thick insulation. Closed- cell insulation is
recommended in all long- line applications.
4. Spe cial consideration should be give n to is olating
interconnecting tubing from the building structure. Isolate the
tubing so vibration or noise is not transmitted into the
structure.
Long Line Applications, 38MAQ Units:
1. No change in line sizing is required.
2. Add refrigerant per table below.
ADDITIONAL CHARGE TABLE
Unit
Size
Total Line
Length ft
Additional Charge, oz/ft.
ft (m)
Min Max
10 - 25
(3 - 8)
>25 - 82
(8 - 25)
>82 - 164
(25 - 50)
9
10
82
None
0.1612
18
98
24
0.32 0.32
30 164