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For systems with capillary tubes or fixed restrictors, a Positive Tempera-

ture Coefficient (PTC) hard start device is recommended. Choose from

3 models in the SPP Series to match the application. Table 4 outlines the

product specifications:

Table 4. SPP Series

Positive Temperature Coefficient (PTC) Hard Starts

SUPCO

VOLTAGE hp TORQUE

P/N (VAC) RATING INCREASE

SPP5 90 – 277 ½ - 10 hp 300%

SPP6 90 – 277 ½ - 10 hp 500%

SPP7S 90 - 277 ½ - 10 hp 600 %

UL/NATE

There are companies and organizations who define the benchmarks for product quality and

safety. The most recognizable safety markings on products is the UL mark. There are many

companies offering hard start kits that have not been tested, or have failed testing by UL.

Other manufacturers use a UL recognized start capacitor, but the relay circuitry is NOT UL

approved. Both the start capacitor and relay circuitry MUST be approved together as a control

device. It is important to only trust a hard start kit that carries the UL mark for the device as a

control device; meaning both start capacitor and relay circuitry are UL approved. By installing

a non-approved device, an expensive air conditioning system is exposed to unnecessary risk.

All of SUPCO’s hard start kits are UL approved and carry the UL mark.

North American Technician Excellence (NATE) sets the standards for education in the

HVAC/ R industry. SUPCO offers a one hour NATE Certification seminar entitled “A/C Hard

Start Devices”, with the objective of educating the professional on the evolution, application

and selection of air conditioning hard start kits.