507719-01 Issue 1718 Page 1 of 22

This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in

manuals, be alert to the potential for personal injury or death.

These instructions must be read and understood completely before attempting installation.

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

Table of Contents

Unit Dimensions ..........................................................2

Duct System and Filters ............................................10

Brazing Refrigerant Lines .......................................... 11

Sealing the Unit .........................................................13

Electrical Connections ...............................................13

Air Flow — Cooling Blower Speed ............................17

Check-Out Procedures ..............................................19

Operation ...................................................................19

Maintenance ..............................................................20

Cabinet Insulation ......................................................20

Use of Air Handler During Construction.....................20

Jackson, MI 49203

*P507719-01*

(P) 507719-01

INSTALLATION INSTRUCTIONS

HMG*X SERIES AIR HANDLER

507719-01Issue 1718Page 2 of 22

A

CB

F

G

AIR FLOW

E

Note: Unit is shipped congured for horizontal left-hand air discharge. Unit may be converted to horizontal right-hand air

discharge by repositioning horizontal drain pan.

Dimensions remain the same in all congurations.

Unit Dimensions

507719-01 Issue 1718 Page 3 of 22

The Clean Air Act of 1990 bans the intentional venting

of refrigerant (CFCs, HCFCs and HFCs) as of July

1, 1992. Approved methods of recovery, recycling or

reclaiming must be followed. Fines and/or incarceration

may be levied for noncompliance.

1 - Assembled air handler unit factory-equipped for upow

Check equipment for shipping damage. If found,

immediately report damage to the last carrier. Check the

unit rating plate to conrm that delivered unit matches

order.

General

The HMG*X air handler is designed for indoor installation

reproductive harm.

Requirements

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507719-01 Issue 1718 Page 5 of 22

1. The air handler must be supported on the bottom only

2. If installing a unit in an upow application, remove the

equipment damage and personal injury. Be careful

when removing the coil assembly from a unit installed

in right- or left-hand applications. The coil may tip into

the drain pan once it is clear of the cabinet. Support the

coil when removing it.

IMPORTANT

NOTE: This unit may be installed in left-hand or right-hand

install drain lines.

3. Set unit so that it is sloped toward the drain pan end of

the unit (see gure 11).

4. The left-hand air discharge horizontal conguration is

shown in gure 2.

sheet metal screws to connect the return and supply

air plenums as required.

Figure 3. Suspending Horizontal Unit

507719-01Issue 1718Page 6 of 22

For horizontal right-hand air discharge, the following eld

See gure 5.

drip pan between slabs. Move the horizontal drain pan

to the opposite side of the coil. See gure 6.

Figure 5

Figure 6

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Figure 7

drain pan in place. See gure 9.

Figure 9

8. Reinstall the blower and coil access panels.

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Condensate Drain

The air handler is provided with ¾” NPT condensate drain connections.

On units of this type, where the blower “draws” rather than “blows” air through the coil, traps must be installed in the

lines into the air supply.

IMPORTANT

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4. If the secondary drain line is to be used, remove the

requirements on the secondary drain line.

5. Check again to ensure drain ports and drain pan are

free of all debris.

6. Plug and check any unused drain pan openings for

NOTE - Horizontal runs must have an anti-siphon air

vent (standpipe) installed ahead of the horizontal run.

See gure 10. An extremely long horizontal run may

require an oversized drain line to eliminate air traps.

NOTE - Do not operate air handler without a trap in

the negative pressure side of the blower; therefore, air

positive drainage without a proper trap.

8. Route the drain line to the outside or to an appropriate

9. Insulate the drain lines where sweating could cause

water damage.

Test the drain pan and drain line after installation:

1. Pour several quarts of water into drain pan. Use

enough water to ll both the drain trap and the line.

2. Check the installed drain pan. Drain pan must be

draining completely. Drain line ttings must not be

primary drain line.

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The cooling blower speed is factory congured to provide

correct air ow for an outdoor unit that matches the cooling

capacity rating of the air handler.

may need to be changed. Refer to blower performance

chart (table 4).

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Table 4. Blower Performance

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NOTE: Refer to outdoor unit installation instructions for

• If horizontally congured, is the unit sloped up to 5/8

• Will the unit be accessible for servicing?

• Has an auxiliary pan been provided under the unit

• Is the lter clean, in place, and of adequate size?

• Is the wiring neat, correct, and in accordance with the

• Is the unit properly grounded and protected (fused)?

• Is the thermostat correctly wired and in a good

• Are all access panels in place and secure?

• Set thermostat to FAN ON.

• Check the air ow from a register to conrm that the

• Set the thermostat 5ºF higher than the indoor

minimum of 3 minutes for all sequencers to cycle on.

• Set the thermostat so that it does not call for heat.

Allow up to 5 minutes for all sequencers to cycle off.

motor.

On heat pumps, circuit R and O energizes the reversing

valve, switching the valve to the cooling position. (The

reversing valve remains energized as long as the

thermostat selector switch is in the COOL position.)

and outdoor unit should cycle off. Air handler should cycle

off 45 seconds after the outdoor unit shuts off.

When the thermostat calls for heat, the circuit between R

close, causing the indoor blower motor to operate. The

and outdoor fan motor.

If the room temperature continues to decrease, the circuit

between R and W1 is completed by the second-stage heat

507719-01Issue 1718Page 20 of 22

applicable). A jumper should be placed between W2 and E

will transfer to the rst-stage heat on the thermostat. This

will allow the indoor blower to cycle on and off with the

electric heat when the fan switch is in the AUTO position.

Maintenance

IMPORTANT

• Inspect air lters at least once a month and replace or

pointing in the direction of air ow. Do not replace a

cleanable (high velocity) lter with a disposable (low

• If water is seen dripping from the secondary drain line,

contact a qualied service technician. This is a sign

of a problem that must be investigated and corrected.

Cabinet Insulation

IMPORTANT

Matte- or foil-faced insulation is installed in indoor equipment

of the cabinet, which leads to sheet metal corrosion and

subsequently, component failure.

maintained during construction.

completion.

and duct system must be thoroughly cleaned following

nal construction clean-up.

according to these installation instructions.