American Standard ASYSTAT605 Instructions de montage

INSTALLER’S GUIDE

ASYSTAT605 HEAT/COOLING THERMOSTAT

Fig 2. Mounting of sub-baseFig 1. Thermostat with cover removed to show various parts

18-HD03D3-3

LOCATION

Locate the thermostat on an inside wall, since the temperature

of an outside wall varies with outdoor conditions.

The position on the inside wall should not be less than 18 inches

from the junction of an outside wall.

The vertical location should be between three and five feet above

the floor. The lower mounting has the advantage of being more

nearly in the zone of occupancy but is subject to furniture inter-

ference and to tampering by children.

The location should permit a free flow of air over the thermo-

stat.

Having made a tentative selection of the best mounting location,

check against the following possible objections:

1. Steam pipes, water pipes or warm-air stacks in adjacent

partition space;

2. Cold, unused room on opposite side of partition;

3. Kitchen range on opposite side of partition;

4. Subject to radiation from fireplace or direct sun effect from

windows;

5. Subject to drafts from stairwells or outside doors;

6. In direct path of air currents from radiators or air delivery

registers;

7. Heat from nearby table or floor lamps or television receiver.

MOUNTING AND WIRING

Having selected the most desirable location, proceed with mount-

ing and wiring as follows:

1. Pull cover from thermostat.

2. Remove the thermostat from the sub-base by loosening the

four screws. See Figure 1.

3. Mark the two desired mounting holes and the cable hole, us-

ing the subbase as a template.

It is recommended that the holes marked “B” be used for stud

mounting and the holes marked “C” be used for normal wall

mounting. See Figure 2.

4. Drill the three holes previously marked on the wall.

5. Make the connections to the thermostat sub-base in accor-

dance with the color code and the wiring diagram that applies.

See mounting instructions, Figure 2, and system wiring diagram,

Figure 3.

6. Fasten the sub-base to the wall with wood screws provided.

Push excess cable back into wall and PLUG WALL OPENINGS

WITH PUTTY OR CAULKING COMPOUND to prevent

drafts from affecting thermostat. Replace the thermostat on the

sub-base. MAKE SURE THAT ALL FOUR SCREWS ARE

TIGHT.

7. Replace cover on thermostat.

8. Wiring must comply with local electrical codes and such

National Codes as apply.

ADJUSTABLE HEAT ANTICIPATOR

The heat anticipator in the thermostat is adjustable to the control

circuit current and is mounted in the thermostat as shown in

Figure 1. The current range is marked on the carton label.

To select the proper amount of heat anticipation, move the slider

on the anticipator assembly to the number on the scale corre-

sponding to the control circuit current of the primary control,

gas valve, or heating relay.

page 2 dwg. no. 21A144441 P02

INSTALLER'S GUIDE

P.I.

COOLING ANTICIPATOR

The cooling anticipator is a fixed-type resistor designed for the

best “on-off” timing of the cooling cycles. Do not remove or re-

place with a resistor of a different value.

CHECKING THERMOSTAT OPERATION

Check control system as follows to make sure that it is function-

ing properly.

The thermostat Heat Anticipator will be damaged if load

is shorted out through improper wiring or testing. Do

NOT short terminals on gas valve to test operation.

1. Set Cool-Heat system switch at “Heat” position. Manually

increase the dial temperature setting until heating plant starts.

Then decrease setting until heating plant stops.

2. Set Cool-Heat system switch at “OFF” position. Increase and

decrease temperature dial setting to make sure that neither the

heating plant nor cooling plant operates.

3. Set Cool-Heat system switch at “Cool”. Manually decrease

the dial temperature setting until the cooling plant starts.Then

increase dial setting to make sure cooling plant shuts off. DO

NOT RESTART FOR AT LEAST 5 MINUTES, AS RAPID

CYCLING WILL DAMAGE THE COOLING UNIT.

4. To check fan switch operation, procedure is as follows:

a. Place fan switch in “Auto” position and Cool-Heat switch at

“Cool”. The fan should cycle with the cooling plant.

b. With fan switch in “Auto” position and Cool-Heat switch at

“Heat”, the fan should be controlled by the fan switch in the

plenum chamber, except in some electric heater installations

(Figure 3C) where fan cycles with heaters.

c. With the fan switch at “On”, the fan should run constantly,

regardless of the position of the Cool-Heat system switch.

5. If, during operation, the burner “on” time is too short or too

long to provide the desired comfort conditions, the cycle may be

lengthened by moving the slider in the direction of the arrow on

the scale or shortened by moving the slider in the opposite direc-

tion. The slider should not be moved more than one-half a scale

division at a time.

FIELD ADJUSTMENTS

(Make Adjustments Only When Required)

The room thermostat is extremely sensitive and is affected by

heat of the hand while adjustments are being made. Therefore,

after any adjustment, allow approximately one hour for the

thermostat to become stabilized to room conditions before final

testing.

DIFFERENTIAL

The differential is factory set and cannot be changed in the field.

Proper switch action is characterized by a positive “snap” of the

armature from “Stop to Stop” as the setting dial is rotated through

the differential.

CALIBRATION

If the thermostat is found to be out of calibration when checked

in its normal operating position after remaining at least one hour

at room temperature, the calibration may be adjusted by means

of the cam rider screw, see Figure 1.

Set the dial at room temperature and selector switch on “Heat.”

Turn the cam rider screw clockwise until the heating plant is off.

Allow the thermostat bimetal to stabilize a few minutes with the

heating plant off. Then slowly turn the cam rider screw counter-

clockwise until the contacts just close and heating plant starts.

All thermostats are set to close the heating contacts at the dial

setting.

THERMOMETER

The ASYSTAT605 thermostat is equipped with a highly sensi-

tive spiral-wound bimetallic thermometer. Normally no adjust-

ments should be required. If, however, the calibration is out of

adjustment, the thermometer may be recalibrated by turning

the screw head directly behind the thermometer element inside

the cover. It is not necessary to remove the crystal on the cover

to make this adjustment.

SYSTEM WIRING DIAGRAMS

(Dotted lines are Field Wiring)

Fig. 3B. Typical Wiring Diagram of

air conditioner and furnace

hook up.

Fig. 3A. Schematic Diagram of

thermostat

Fig. 3C. Typical Wiring Diagram of air

conditioner with air handler

and heater hook up.

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