Carrier 50MH - Manual

Carrier
ingle-Packagé Cooling Units
(Mobile Home Unit)
INTRODUCTION
The 50MH unit is a complete cooling system,
with provision for addition of accessory electric
heaters. Units are air cooled, designed for outdoor
installation and may be connected into existing
duct system Required connections include air
ducts, condensate drain, line and control power
wiring, A field-supplied filter box must be installed
for return air.
TRANSPORTATION DAMAGE
File claim with shipping company if shipment is
damaged or incomplete. Move unit to installation
site in upright position.
PRELIMINARY SURVEY
Consult local building codes for special installa­
tion requirements.
When installing unit, allow sufficient space for
condenser air-flow clearance, wiring, and servicing
unit (see Fig. 1). Position unit so water from roof
will not pour directly on top of unit.
Mounting Pad (Fig. 1) — Install unit on a solid,
level-poured concrete pad or equivalent. Construct
pad so top is a minimum of 3 in. above ground
level. Pad must not be more than one inch longer
or wider than unit. Extend a 24-in. gravel apron
completely around pad. Insert a sheet of tar-base
construction felt paper between unit and pad.
DUCTWORK
Design duct system to have a friction loss of
between .25 in. wg and .70 in. wg for proper unit
operation. Insulated flexible ductwork (1-ft inside
diameter) of weatherproof type is recommended.
Do not reduce duct inside diameter below 1 ft.
Combined length of supply and return ducts
should not exceed 20 ft with a minimum supply
duct length of 6 ft and a minimum return duct
length of 3 ft. Do not operate unit longer than 5
minutes without ductwork. If necessary, refer to
Carrier System Design Manual, Part 2, for air duct
design.
Flanges are provided on unit for attaching
ductwork. See Fig. 1 for connection sizes and Fig.
2 for typical duct installation.
Supply Air Connection — Connect flexible duct to
unit supply air connection. When unit is equipped
with electric heaters, insert a sheet metal sleeve
inside of flexible duct. Sleeve must extend 24 in.
from electric heater element. At approximate
4'-0" OVERHEAD
; AIR SPACE REQUIRED
I DIAM LOW
VOLTAGE CONN
2-0
GRAVEL APRON
AROUND PAD :
OPERATING WT:
50MH003-275 LBS
50MH004-295 LBS
li DIAM |3 nv,...
M POWER ® DIAM
A' MAX cnppi Y KNOCKOUT
(4 SIDES) KNOCKOUTS
FRONT VIEW
11^ EVAPORATOR AIR FLOW
^CONDENSER AIR FLOW
■'Mli
t
---- ■ i"
<L ^
RETURN AIR
'-0" DIAM
REAR VIEW
ID
CONDENSATE
DRAIN
Fig. 1 — Dimensions and Connections
center of trailer, connect flexible duct to main
supply duct with a 90-degree sheet metal elbow.
Install turning vanes in main supply duct directly
above elbow connection using standard sheet metal
practices.
Return Air Connection — Purchase or field fabri­
cate a filter box. Suggested minimum filter box
dimensions are shown in Fig. 3 (see page 3). At
approximate center of trailer, cut a return air
opening in floor. Locate opening where it will not
be obstructed by furniture. Size opening to accept
filter box. Cut hole in carpet or floor covering
same size as filter box floor opening. Ensure
electrical wiring or main structural supports are not
accidentally cut. Insert filter box thru floor open­
ing. Weatherseal floor connection in accordance
with good construction practice. Insert filters in
filter box, and cover with return air grille.
® Carrier Corporation 1971 Form 50MH-1SI