Amana PTC093E35AXXXAB Specifications download pdf (Page 27)

27

SEQUENCE OF OPERATION

Cooling Mode

Set the thermostat to the desired temperature then set the

mode switch to high or low cool. The fan motor will start first

then the compressor will start approximately 10 seconds later.

When the room temperature has reached the desired tempera-

ture the compressor will shut off and the fan will continue to run

for 30 seconds then shut off. If the fan cycle switch has been

set to "ON" or the electronic board has been programmed for

"ON" the fan will continue to run.

Heating Mode

Set the thermostat to the desired temperature then set the

mode switch to high or low heat. The fan motor will start, the

reversing valve will engage and then the compressor or electric

heat strip will start. If the unit is a heat pump the temperature

of the room and the set point of the thermostat will determine if

the unit brings on the compressor or electric heat. The room

temperature will need to be within 4 degree's of the thermostat

set point on "C-K" models and 2 1/2 degree's on "A-B" models

for the compressor to come on in the heat pump mode. Any

time the temperature of the room is more then 4 degree's or 2

1/2 degree's colder than the set point the electric heat will be

energized. The outdoor coil thermostat or thermistor will lock

out the compressor when the outdoor coil reaches a certain

temperature. Clamp on bi-metal thermostat disc's may be on

"A-B" model units. The bi-metal thermostats will open when

the coil temperature reaches 25º ± 5º and closes at 50º. The

plug in thermistors on the "C-K" models will lock the compres-

sor out at 24º outdoor temperature and allow heat pump opera-

tion to come back on at 33º.

CONTROL BOARD CHARACTERISTICS

• Automatic 3-minute Compressor Lockout - After the

compressor cycles off, it will not restart for three minutes.

This feature is enabled in standard or remote thermostat

control.

NOTE: This delay may be defeated by shorting the “FD1” and

“FD2” terminals together for a minimum of 5 seconds

• Compressor lock-in feature- Whenever the compressor

is switched from off to on because the room temperature

has risen above or fallen below the specified limit it will

remain on for at least four minutes. However , if the ther-

mostat point is changed during the four minutes this lock

in feature is overridden.

• Automatic 2nd Stage Electric Heat (Heat Pump Mod-

els)- If the room temperature falls to 4°F below the set

point temperature, the reverse cycle heat pump is shut off

and the strip heat is turned on.

• Automatic Freeze Protection - Whenever power is sup-

plied to the unit and the master switch is in the ON posi-

tion, automatic freeze protection is active. If the thermistor

senses temperature below 40°F+/-5°F, the fan motor and

electric strip heat (or hydronic heat, if applicable) are

switched on. The heater and fan will remain on until the

Thermistor senses a temperature of 43°F.

• Fan Advance/ Delay- The advance feature will allow the

fan to start six seconds prior to the compressor starting in

either cooling or heating mode. The delay will keep the fan

running for thirty seconds after the compressor stops in

either cooling or heating modes.

• Remote Thermostats - Always use an approved thermo-

stat supplied by the manufacturer. A wall thermostat that

has not been approved by the manufacturer may not work

correctly with this unit.

• Remote Functions - All functions are controlled by a wall

mounted thermostat.

• Remote Fan- When GL terminal is connected to R termi-

nal the remote fan speed is switched to low. GH terminal

connected to the R terminal fan speed is switched to high.

• Fuse Protection- The fuse protection has been maximized

on the 24 volt circuit so accidental groundings of the exter-

nal terminals will not result in a burned out board. The unit

may be operated in standard mode if the fuse is blown.

There will be an auxiliary fuse supplied with the board. It

will be attached to the main fuse by a plastic clip. The fuse

is a 500 ma fuse. When replacing the fuse always use the

correct fuse part #M0804205.

• Random Delay - When the master switch is turned on or

power is reapplied to the control, all functionality will be

locked out for a random period between two and four min-

utes, if Y or W inputs are active in remote or the mode

switch is set to HI/LO heat or cool. The delay can be avoided

if the front desk terminals are closed for more than two

seconds, or the mode switch is in the off or fan only posi-

tion.

• Transformer Selection- Some boards come with the

transformer selection set for on-board use, if an external

transformer is utilized move the jumper from "ON-BOARD

to EXTERNAL". If applicable, the wiring for an external trans-

former connects to the "EXT XFRMR" terminals.

• Indoor Ambient Thermistor- The Indoor Ambient Ther-

mistor senses actual room temperature.

• Indoor/Outdoor Coil Thermistors- In the cooling mode,

if the compressor is engaged continuously for 20 minutes

and the Indoor Coil Thermistor is below 30 degrees the

compressor is disengaged until the ICT rises above 45

degrees. The Outdoor Coil Thermistor senses coil tem-

perature which correlates to outdoor air temperature. Heat

pump operation can operate as low as 24°F outdoor tem-

perature depending upon humidity conditions and/or the

balance point of the system. After defrost is initiated, the

compressor remains off for at least thirty minutes and re-

sumes operation when the outdoor coil temperature

reaches 33°F. Electric resistance heat will maintain the

ambient room temperature anytime the temperature falls

4°F below the room set point temperature.

• Load Shedding-The LS & IN terminals are used for load

shedding. A switch can be added to close the circuit to

lock out the compressor and electric heat when the power

company or energy management system is trying to re-

duce its load for a specified time.

OPERATIONS

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