OPERATION
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| SWITCH POSITIONS |
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| SYSTEM FUNCTION |
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| FAN |
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| SYSTEM |
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| Rev | Rev | Aux |
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| Fan | Valve | Valve | Heat | Compr. | Emer | Aux. | COMPONENT OPERATION | ||||||||||||||
Auto |
| On | Cool |
| Off | Heat | Emer | Relay | (O) |
| (B) | Relay | Contact | Light | Light | ||||||||||||||||||||||||
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| No heat - no cool - no fan - no lights |
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| Heating Mode: stage 1 calling. Fan relay, |
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| compressor contactor, and reversing valve (B) |
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| energized by thermostat. |
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| Heating Mode: both stages calling. Fan relay, |
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| compressor contactor, reversing valve (B), |
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| and auxiliary heat relay are energized. |
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| Emergency Heat Mode: aux heat, fan relay *, |
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| and reversing valve (B) are energized. |
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| Compressor locked out. |
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| Cooling Mode: Fan relay, compressor |
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| contactor and reversing valve (O) energized. |
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| Fan On: Energizes fan relay regardless |
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| of system switch position. |
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Indicates switch position on thermostat subbase and system function in operation.
* In Emergency Heat Mode, fan may be disabled, if required, by cutting jumper W7 (see fig 3).
This thermostat is easy to operate. The above table shows how the system will operate when the FAN and SYSTEM switches are in different positions.
To set the switches, open the door on the left side of the thermostat (see fig 6). Move the FAN and SYSTEM switches up or down to select desired system operation. To set the temperature, move the temperature selection knob (on the right side of the thermostat) until the desired temperature is shown in the window.
ANTICIPATION ADJUSTMENT
The anticipation setting on this thermostat is adjustable. Any anticipation setting (including the factory setting) will work with any system for which this thermostat is intended for use. However, the user may be more comfortable with a particular setting. If the system is turning on and off too often (short cycles) or not often enough (long cycles) for the user’s comfort, follow these steps to adjust the antici- pation.
FAN |
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AUTO |
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ON |
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| 70 |
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COOL |
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| 50 60 70 80 | 90 |
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OFF |
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HEAT |
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EMER |
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Figure 6. Thermostat with door open
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| Antic.=14* |
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Antic.=10* | (Factory setting) | Antic.=16* | Antic.=30* | ||||||||
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| 1 | 2 | 1 | 2 |
| 1 | 2 |
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| 1 | 2 |
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| OFF |
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| OFF |
| OFF | OFF | ||||
Shorter |
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| Longer | |
Cycles |
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| Cycles | |
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*These numbers represent different anticipation settings. See fig. 8 for further information.
Figure 7. Anticipation selection switch settings
First Stage Heat & Cool | Second Stage & Emergency Heat |
1. | Turn off power to the thermostat. |
2. | Remove the thermostat cover. |
3. | Find the anticipation adjustment switches (see fig. 3). |
4. | Using a pencil or small screwdriver, move the switches |
| to the desired setting (see figs. 7 and 8). |
5. | Carefully snap the cover onto the thermostat base. |
Anticipation | Approx. |
Reference | Temperature |
Number | Differential* |
10 | 0.8°F |
14 | 1.1°F |
16 | 1.3°F |
30 | 2.4°F |
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Anticipation | Approx. |
Reference | Temperature |
Number | Differential* |
10 | 0.3°F |
14 | 0.4°F |
16 | 0.5°F |
30 | 0.9°F |
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6. Turn on power to the thermostat. |
*These numbers are approximate and represent thermostat operation with a typical system. Actual temperature differentials may vary.
Figure 8. Approximate temperature differential and cycle times
LOCKOUT BYPASS OPTION | COMPRESSOR SHORT TERM |
FOR QUALIFIED SERVICE TECHNICIANS’ USE | CYCLE PROTECTION |
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ONLY. OPERATORS SHOULD NOT USE THIS FEA- | This thermostat has a |
TURE DUE TO POSSIBILITY OF EQUIPMENT OR | time delay. During this |
PROPERTY DAMAGE, OR PERSONAL INJURY. | will lock out the compressor to allow head pressure to |
DO NOT USE THE LOCKOUT BYPASS OPTION | stabilize. If you want to override this feature while |
UNLESS THE COMPRESSOR OIL HEATERS HAVE | testing thermostat operation, move the SYSTEM switch |
BEEN OPERATIONAL FOR 6 HOURS AND THE | to OFF. Wait about 6 to 8 seconds, then move the |
SYSTEM HAS NOT BEEN OPERATIONAL FOR AT | SYSTEM switch back to the previous position. |
LEAST 5 MINUTES. |
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