Carrier 50MH User 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

2-0

GRAVEL APRON AROUND PAD :

OPERATING WT: 50MH003-275 LBS

50MH004-295 LBS

M POWER ® DIAM

A' MAX cnppi Y KNOCKOUT

(4 SIDES) KNOCKOUTS

li DIAM |3 nv,...

VOLTAGE CONN

FRONT VIEW

■'Mli

---

11^ EVAPORATOR AIR FLOW ^CONDENSER AIR FLOW

Fig. 1 — Dimensions and Connections

■ i"

<L ^

RETURN AIR

'-0" DIAM

ID CONDENSATE DRAIN

REAR VIEW

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

DETAIL A

(RETURN ASSEMBLY)

DETAIL B

(SUPPLY ASSEMBLY)

Fig. 2 — Typical Installation

(7) RETURN A5R REGISTER

( z ) l4*x25”;il“nETER(PERMANEN7

^ TYPE) iT) RETURN AiR PLENUM

COLLAR

FLEXIBLE DUCT :0! BAFFLE (T) TAP*IN COLLAR

(e) INSULATED ELBOW

LINER

------

CONTROL WIRING

——POWER WIRING

^ CONDENSER AIR FLOW

evaporator air flow

Connect flexible duct to filter box. Extend duct from filter box to unit return air connection. If possible, insert a total of a 90-degree bend in return air duct for sound dampening. Connect duct to unit return air connection.

When existing furnace is kept in system:

During heating season, insert a sheet metal panel beneath return air grille and over filter to prevent air movement thru cooling unit.

When furnace is removed from system, blank off original furnace floor connection.

CONDENSATE DRAIN

A condensate trap is factory supplied and taped to unit suction line for shipment. Connect trap to unit condensate drain fitting with clamp provided. See Fig. 4 and 5.

Applying Clamp

1. Pull ends apart.

2. Wrap around condensate trap with toothed end beneath. Prelatch by compressing until last ratchet teeth catch behind small tabs.

3. Grip adjacent bridges with pliers and compress to tight position.

4. To remove, lift the locking tongue with screwdriver.

ELECTRIC RESISTANCE HEATER

Remove fan section access panel and sheet

metal plate covering heater installation area (be tween evaporator fan discharge and supply air

connection). See Fig. 6. Discard sheet metal plate and insert heater into opening provided. Insert heater support bar thru hole in side of fan

discharge duct. Fasten heater in place at top and

bottom with two sheet metal screws. See Wiring

section for power connection details.

Fig. 3 — Minimum Dimensions Return Air

Filter Box

fRl

Fig. 5 — Condensate Drain Connection

LINE POWER LEADS FROM HEATER

CONTROL WIRING RECEPTACLE

Fig. 6 — Electric Resistance Heater Installation

CONTROL LEADS FROM HEATER

ELECTRIC HEATER ASSEMBLY

HEATER INSTALLATION OPENING

i.0Ci(fN6

ELECTRICAL DATA AND WIRING

Table 1 — Unit Electrical Data

EVAP

COMPR

LRA FLA FLA FLA

86.0 19.5 3.4 1 1 10 30 20 0

93 0

50MH

003

004

VOLTS/

230/1

MODEL

LRA — Locked Rotor Amps FLA — Full Load Amps

NOTE: Motors and controls will operate satisfactorily 10% above and 10% below unit voltage. Control circuit voltage is 24 volts on all units.

COND

FAN

3 4 1 1 10 30 30

BRANCH CKT

Wire

Max

Size

Wire

(AWG)

Fuse

Amps

Table 2 — Electric Resistance Heater Data

ELECTRIC HEATER

UNIT 50MH

003

004

Volts/

240/1

No.

1 41.7 6 30

15 2

Branch Circuit

FLA (ea)

Wire Size

(AWG)

20.8 10

20 8 41 7 6

Max

Wire

30 30

30 50

Fuse Amps

30 50

CLA«P IN LOCKIXS POSJTiO«

Fig. 4 — Condensate Drain Clamp

Wiring — Field wiring must comply with local and

national codes. Install a branch circuit fused disconnect of adequate size to handle unit starting current. Provide a separate fused disconnect for

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