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The A70 single-pole and A72 two-pole controls are supplied in a wide selection of ranges to meet most application needs. See "Temperature Ranges."
Models may be supplied to open a circuit on temperature increase or close a circuit on temperature increase as required. An A70 single-pole control may optionally include a separate reverse-acting auxiliary contact. Models are available with a SPDT enclosed Pennswitch.
Features
- Long life contact structure with high contact force right up to break, no bounce on make.
- Make reset models are "trip-free"
- Ranges available to cover most applications.
- Auxiliary contact can be used to actuate an alarm circuit when the main contact opens.
- Two-pole construction provides a number of application advantages (see "General Description"
- Heavy gauge "low profile" stainless steel element cup to protect against mechanical damage.
Mode of Operation - Upon application power, the load is energized. When the thermostat or other switch opens or there is a loss of power, the load is de-energized and the delay period begins. The compressor will not start again during the delay period. Restart occurs after the delay period has elapsed.
Installation & Operation Notes:
- Disconnect power at all sources and verify that all circuits are de-energized before starting work
- Mount the contactor securely in the control compartment or electrical panel as directed by the equipment manufacturer
- Move line, load, and control wires from the existing contactor to the new contactor, matching wiring diagrams and terminal markings
- After energizing the system, verify that the contactor pulls in and opens cleanly, with proper operation during system start and stop cycles
- Confirm that all terminations are tight and that wiring is supported to prevent strain at the terminals
Maintenance & Troubleshooting:
- Inspect the contactor during routine HVAC maintenance for pitted or burned contacts, coil discoloration, or mechanical binding
- Replace the contactor if the coil fails to energize, if the contacts do not close fully, or if there is evidence of overheating or excessive humming
- If repeated contactor issues occur, verify that load current and control voltage are within specification and that short cycling is not overstressing the contactor
Certifications & Compliance:
- Meets ARI 780/790 Standard
User Reviews & Q&A Summary:
- Common theme is "correct part" for the intended replacement, with users reporting it worked as expected after installation
- Review feedback frequently mentions straightforward installation for a direct replacement
- Value and fulfillment are recurring positives (good deal/price and fast shipping)
Product Highlights
15°F Min Temp   
55°F Max Temp   
15°F - 55°F   
Open LowSpecs
| Capillary Length: | 20' |
|---|---|
| Min Temp (F): | 15°F |
| Max Temp (F): | 55°F |
| Temperature Range (F): | 15°F - 55°F |
| Poles: | 1 |
| Features: | Lockout w/ Manual Reset Reverse Acting Aux. Contact |
| Conduit Diameter: | 1/2" |
| Switch Action: | Open Low |
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