American Standard TMM5A0B24M21SAA Installer'S Manual Download

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3.8.4 MOTOR SPEED

• Low voltage control connections are made to low voltage pigtails

extending from top of air handler (see Figure 1). Connections for

control wiring are made with wire nuts. Control wiring knockouts (7/8˝)

are also provided on the right and left side of the unit for side connec-

tion.

• See wiring diagrams attached to indoor and outdoor sections to be

connected.

• Make sure, after installation, separation of control wiring and power

wiring has been maintained.

3.8.3 GROUNDING

The unit must be permanently grounded. Failure to do so can

result in electrical shock causing personal injury or death.

• Grounding may be accomplished by grounding metal conduit when

installed in accordance with electrical codes to the unit cabinet or by

attaching ground wire(s) to ground lug(s) provided in the unit wiring

compartment.

• Ground lug(s) are located close to wire entrance on left side of unit

(up-flow). Lug(s) may be moved to marked locations near wire

entrance on right side of unit (upflow). If alternate location is more

convenient.

• Use of multiple supply circuits require grounding of each circuit to

lug(s) provided in unit.

• If required, install a branch circuit disconnect of adequate size,

located within sight of, and readily accessible to the unit.

•

IMPORTANT

: After the Electric Heater is installed, units are

equipped with one 60 amp. circuit breaker. These breaker(s) protect

the internal wiring in the event of a short circuit and serve as a

disconnect. Circuit breakers installed within the unit do not provide

over-current protection of the supply wiring and therefore may be

sized larger than the branch circuit protection.

• Supply circuit power wiring must be 75°C minimum copper

conductors only. See Electrical Data in this section for ampacity,

wire size and circuit protector require ment. Supply circuit protective

devices may be either fuses or “HACR” type circuit breakers.

• Power wiring may be connected to either the right or left side

Two 7/8” dia. concentric knockouts are provided for connection of

power wiring to unit.

• Power wiring is connected to the power terminal block in unit

electric cabinet.

3.8.2 CONTROL WIRING

IMPORTANT: Class 2 low voltage control wiring should not be run in

conduit with main power wiring and must be separated from power

wiring, unless class 1 wire of proper voltage rating is used.

Select a thermostat that is commonly used with HP or AC single

stage heating/cooling with electric heat. The thermostat will energize

the fan on a demand for heat or cool.

Install the thermostat on an inside wall, away from drafts, lights or

other heat sources in a location that has sufficient air circulation from

other rooms being controlled by the thermostat. The thermostat

should be mounted 4 to 5 feet above the floor.

• Low voltage control wiring should be 18 Awg. color-coded. For

lengths longer than 100 ft., 16 Awg. wire should be used.

ECM Motor Speed Taps(Model number 24

36)

Tap

Delay ---off

Time (s)

Tap 1

---

Tap 2

---

Default

---

Tap 3

---

Tap 4

Default

---

Default

Tap 5

---

Field wiring must comply with the National Electric Code (C.E.C. in

Canada) and any applicable local ordinance.

Disconnect all power to unit before installing or servicing. More

than one disconnect switch may be required to de-energize the

equipment. Hazardous voltage can cause severe personal injury

or death.

3.8.1 POWER WIRING

It is important that proper electrical power is available for connection

to the unit model being installed. See the unit nameplate, wiring

diagram and electrical data in the installation instructions.

WARNING

3.5 Refrigerant Piping

Refrigerant pipe connections are located on the top of the unit.

Refrigerant piping external to the unit shall be sized in accordance

with the instructions of the outdoor equipment. When units are

recessed mounted in the wall, make certain that piping connections

are pressure tested prior to the wall being closed. While brazing, be

sure to protect the cabinet and grommets from heat damage.

3.6 Metering Device

All units are shipped and installed with an internally-checked,

non-bleed TXV designed for air conditioning or heat pump

operation. Pressures equalize after shut down. Some outdoor

models may require a start assist kit. See outdoor unit for more

information.

3.7 Blower

3.8 Wiring

3.10 Thermostat

To protect the coil, blower and other internal parts from excessive dirt

and dust an air filter must be installed before air enters the evaporator

coil. A filter must be installed. Consult the filter manufacturer for

proper sizing and maximum velocity requirements.

3.9 Air Filter

This unit is supplied with a multi-speed motor with a direct drive

blower wheel which can obtain various air flows. The unit is shipped

with factory set cooling and heating speed taps. Airflow performance

tables are available for additional speed taps. Disconnect all power

to the unit before making any adjustments to the motor speed taps.

Be sure to check the air flow and the temperature drop across the

evaporator coil to ensure sufficient air flow.

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NOTES:
1: Use Copper Wire (75

Min) Only Between Disconnect Swicth And Unit .

2: To Be Wired In Accordance With NEC And Local Codes.
3: If Any Of The Original Wire ,As Supplied,Must Be Replaced.Use The Same

Or Equivalent Type Wire.

4: Connect R To R,G To G,Etc.See Outdoor Instruction For Details.
5: To Change Speed Tap,Move Blue Wire Desird Terminal.
6: See Airflow Tables For Tap Usage.
7:Factory Wires May Be Present,DO NOT USE.

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NOTES:
1: Use Copper Wire (75

Min) Only Between Disconnect Swicth And Unit .

2: To Be Wired In Accordance With NEC And Local Codes.
3: If Any Of The Original Wire ,As Supplied,Must Be Replaced.Use The Same

Or Equivalent Type Wire.

Filter Sizes

Model

Filter Size In. (mm)

20x20x1 (508x508x25)

TMM5A0B24,30,36

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NOTES:
1: Use Copper Wire (75

Min) Only Between Disconnect Swicth And Unit .

2: To Be Wired In Accordance With NEC And Local Codes.
3: If Any Of The Original Wire ,As Supplied,Must Be Replaced.Use The Same

Or Equivalent Type Wire.

4: Connect R To R,G To G,Etc.See Outdoor Instruction For Details.
5: To Change Speed Tap,Move Green Wire Desird Terminal.
6: See Airflow Tables For Tap Usage.

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