Honeywell T87F Manual Do Utilizador

60-2222—3    G.H.  Rev. 8-02 

www.honeywell.com/yourhome

Honeywell

Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North

35 Dynamic Drive

Golden Valley, MN  55422

Scarborough, Ontario
M1V 4Z9

Printed in U.S.A. on recycled 
paper containing at least 10% 
post-consumer paper fibers.

If the current rating is not known, proceed as follows:

1. Connect an ac ammeter of appropriate range (for exam-

ple; 0 to 2A) between the R and W terminals on the 

wallplate, or between R and W on the subbase.

2. Let the system operate through the ammeter for at least 

one minute before taking the reading.

3. Set the heat anticipator to correspond to the ammeter 

reading (see Fig. 15).

4. A slightly higher setting to obtain longer burner-on times 

(and fewer cycles per hour) may be desirable in sys-

tems such as a one-pipe steam system. For example: 

• if burner on-time is too short with a heater setting of 

0.4, adjust to the 0.45 setting and check the system 

operation, then

• adjust to the 0.5 setting and recheck until the desired 

burner-on time is obtained.

On systems using a low voltage gas valve, do not 

apply a jumper across the valve coil terminals.

To check thermostat operation:

1. Turn down the temperature setting to the lowest point. 

2. If the subbase is used, move the system switch to the 

HEAT position. 

3. Raise the temperature setting until the burner starts. 

4. Slowly turn the dial back. (The burner should stop when 

the dial has been turned down below the room tempera-

ture.) 

5. If the T87F controls cooling, move the subbase system 

switch (if used) to COOL and lower the setting until the 

cooling equipment starts.

6. Raise the setting above the room temperature and the 

cooling system should shut down.

7. Make certain that the equipment functions properly in 

response to the thermostat.

The T87F is accurately calibrated at the factory under 

controlled conditions and no recalibration should be 

necessary. If it appears that the thermostat is out of 

calibration, make sure that it is level and is not subjected to 

radiant heat from the sun, radiators, or appliances.

Remove the thermostat cover ring so you can observe the 

mercury switch action. After a five- or ten-minute off-period 

(with thermostat setting below the room temperature), slowly 

raise the setting until the switch just makes contact. If the 

thermometer pointer and setting indicator read the same the 

instant you see the switch make, no recalibration is 

necessary. If recalibration is necessary, proceed as follows:

1. Turn the setting dial a few degrees above the room tem-

perature and remove the cover.

2. Slip the 104994 Calibration Wrench (available on 

request) onto the hex under the bimetal coil (see Fig. 

14).

3. Hold the dial firmly, and turn the hex counterclockwise 

for Group I models and clockwise for Group II models, 

until the mercury breaks contact.

4. Turn the dial to a low setting so that the thermostat 

loses the heat it has gained from your hands and its 

own operation.

5. Wait at least five minutes.

6. Slowly turn the dial until the pointers read the same.

7. Firmly hold the dial—carefully turning the hex clockwise 

for Group I models, counterclockwise for Group II mod-

els—until the mercury switch slips to the heating contact 

end of the tube.

8. Recheck the calibration, select the desired temperature 

and replace the cover.

NOTE: When the T87F provides cooling control, calibration 

for heating automatically calibrates for cooling.