Amana PTH093G Specifications download pdf (Page 38)

OPERATIONS

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 sec-

onds later. When the room temperature has reached the

desired temperature 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 thermo-

stat 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 com-

pressor when the outdoor coil reaches a certain tempera-

ture. 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 com-

pressor out at 24º outdoor temperature and allow heat pump

operation 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 min-

utes. This feature is enabled in standard or remote ther-

mostat 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 compres-

sor is switched from off to on because the room tem-

perature has risen above or fallen below the specified

limit it will remain on for at least four minutes. How-

ever , if the thermostat 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

position, 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 ther-

mostat supplied by the manufacturer. A wall thermo-

stat 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 ter-

minal the remote fan speed is switched to low. GH ter-

minal connected to the R terminal fan speed is switched

to high.

• Fuse Protection- The fuse protection has been maxi-

mized on the 24 volt circuit so accidental groundings of

the external 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 sup-

plied 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 minutes, 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 position.

• Transformer Selection- Some boards come with the

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

nal transformer is utilized move the jumper from "ON-

BOARD to EXTERNAL". If applicable, the wiring for an

external transformer connects to the "EXT XFRMR" ter-

minals.

• Indoor Ambient Thermistor- The Indoor Ambient Ther-

mistor senses actual room temperature.

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Amana PTH093G Specifications Page 38

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