Amana M Series, Installation Instructions Manual

9

4-1/2"

47-9/16"

7-1/2"

4-1/16 DIA.

POWER THRU

THE CURB

RETURN

19-3/8

31-3/8

LOW VOLTAGE

ENTRANCE

HIGH VOLTAGE ENTRANCE

(REMOVE PLUG)

electrical entrance and thru curb

(bottom view of unit) 

Low Voltage Control Wiring 

1.  A 24V thermostat must be installed for unit operation.

2.  Locate thermostat or remote sensor in the 

conditioned space where it will sense average 

temperature. Do not locate the device where it may 

be directly exposed to supply air, sunlight or other 

sources of heat. Follow installation instructions 

packaged with the thermostat.

3.  Use #18 AWG wire for 24V control wiring runs not 

exceeding 75 feet. Use #16 AWG wire for 24V 

control wiring runs not exceeding 125 feet. Use #14 

AWG wire for 24V control wiring runs not exceeding 

200 feet. Low voltage wiring may be National 

Electrical Code (NEC) Class 2 where permitted by 

local codes.

4.  Route thermostat wires from sub-base terminals 

to the unit. Control wiring should enter through the 

condenser panel opening or through curb indicated 

in “Electrical Entrance” figure. Connect thermostat 

and any accessory wiring to low voltage terminal 

block TB1 in the main control box.

NOTE:  Field-supplied conduit may need to be 

installed depending on unit/curb configuration. 

Use #18 AWG solid conductor wire whenever 

connecting thermostat wires to terminals on 

sub-base. DO NOT use larger than #18 AWG wire. 

A transition to #18 AWG wire may be required 

before entering thermostat sub-base.

NOTE: Refer to unit wiring diagrams for 

thermostat or remote sensor connections.

CIRCULATING AIR AND FILTERS

Ductwork

The supply duct from the unit through a wall may be 

installed without clearance. However, minimum unit 

clearances must be maintained (see “Clearances” section).  

The supply duct should be provided with an access panel 

large enough to inspect the air chamber downstream of 

the heat exchanger.  A cover should be tightly attached to 

prevent air leaks.

Ductwork dimensions are shown in the roof curb 

installation manual.

If desired, supply and return duct connections to the unit 

may be made with flexible connections to reduce possible 

unit operating sound transmission.

CONDENSATE DRAIN CONNECTION

Condensate Drain Connection

A 3/4” female NPT drain connection is supplied on the 

end of the unit and bottom of the drain pan for condensate 

piping.  An external trap must be installed for proper 

condensate drainage. Hand tighten drain fitting to the drain 

connection.

DRAIN

CONNECTION

UNIT

2" MINIMUM

FLEXIBLE

TUBING-HOSE

OR PIPE

3" MINIMUM

A POSITIVE LIQUID

SEAL IS REQUIRED

drain connection 

Install condensate drain trap as shown. Use 3/4” drain line 

and fittings or larger. Do not operate without trap. 

Horizontal Drain 

Drainage of condensate directly onto the roof may be 

acceptable; refer to local code. It is recommended that a 

small drip pad of either stone, mortar, wood or metal be 

provided to prevent any possible damage to the roof. 

Vertical Drain

To use the bottom drain connection, remove the drain plug 

from the bottom connection and install it in the horizontal 

connection.

Cleaning

Due to the fact that drain pans in any air conditioning 

unit will have some moisture in them, algae and fungus 

will grow due to airborne bacteria and spores. Periodic 

cleaning is necessary to prevent this build-up from plugging 

the drain.