universal starter question.

[wannafreeze]

I have been using supco's universal pot relays that cover 1 to 5 HP compressors,and the 3 in 1 electronic relay for 1/3,1/4 and 1/2 HP compressors.Can't find anything for 3/4 HP compressors.Seems like for some reason they are left out.:rolleyes:
Do you know if there is any 3 in 1 or a universal pot relay besides supco's and that will work for 3/4 HP.?

[purge]

I believe the Supco SPP5, SPP6 and SPP7 are good for 1/2 to 10HP.
At least according to Johnstone's catalog.
:)

I just looked in my basement and found some Supco Adjustable potential relays #APR5 which are good for up to 5HP, If thats what you mean by pot relay.

[wannafreeze]

I believe the Supco SPP5, SPP6 and SPP7 are good for 1/2 to 10HP.
At least according to Johnstone's catalog.
:)

I had this conversation before.I am not talking about boosters or hard start kits that you connect to the run capacitors.I am talking about start relays,with or without capacitors.

[icehouse]

I have been using supco's universal pot relays that cover 1 to 5 HP compressors,and the 3 in 1 electronic relay for 1/3,1/4 and 1/2 HP compressors.Can't find anything for 3/4 HP compressors.Seems like for some reason they are left out.:rolleyes:
Do you know if there is any 3 in 1 or a universal pot relay besides supco's and that will work for 3/4 HP.?

NOTHING FOR 3/4 THREE IN ONE SPP5&6 are for PSC compressors. Copeland says to use potential relay and start capacitor.:(

[wannafreeze]

NOTHING FOR 3/4 THREE IN ONE SPP5&6 are for PSC compressors. Copeland says to use potential relay and start capacitor.:(

supco has a universal potential relay (1-5 hp).but nothing for 3/4 hp.
I did replace a current magnetic relay with this univ.pot relay though.(for a 3/4 HP compr.)
wasn't there a rule that compressors higher than 1/2 HP use pot relays not magnetic relays? Or do I remember something wrong?

[purge]

Check the Supco literature. I have both of the Supco #SUPR and #APR5 Universal, Adjustable Potential Relays in front of me and I’m reading the instruction/wiring diagram sheet from each. Says they are both good for any “single split-phase or refrigeration hermetic motor 110v to 270v up to 5HP”. To me, that indicates that they should be okay for use on fractional HP motors. Not just 1 thru 5HP motors. I looked in the Tech Sheet on Supco’s website and it says the same thing, so it's possible you may be getting worked up over nothing.
:)

[cfcitywide]

Check the Supco literature. I have both of the Supco #SUPR and #APR5 Universal Adjustable Potential Relays in front of me and I’m reading the instruction/wiring diagram sheet from each. Says they are both good for any “single-phase or refrigeration hermetic motor 110v to 270v up to 5HP”. To me, that indicates that they should be okay for use on fractional HP motors. Not just 1 thru 5HP motors. I looked in the Tech Sheet on Supco’s website and it says the same thing, so it's possible you may be getting worked up over nothing.
:)

How are the settings adjusted on these controls

[wannafreeze]

Check the Supco literature. I have both of the Supco #SUPR and #APR5 Universal, Adjustable Potential Relays in front of me and I’m reading the instruction/wiring diagram sheet from each. Says they are both good for any “single split-phase or refrigeration hermetic motor 110v to 270v up to 5HP”. To me, that indicates that they should be okay for use on fractional HP motors. Not just 1 thru 5HP motors. I looked in the Tech Sheet on Supco’s website and it says the same thing, so it's possible you may be getting worked up over nothing.
:)

I haven't had the adjustable ones,I will check it out.Thanks.:o

[icehouse]

How are the settings adjusted on these controls

Read this SUPR & APR5
Universal Potential Relays




Replacing all potential relays, these WIRE TO WIRE Universal Potential Relays offer the ultimate in convenience. One potential relay to fit any application. Choose to “drop in” the SUPR Universal Potential Relay or “dial in” the exact pick up voltage for the APR5 Adjustable Potential Relay. State of the Art electronic circuitry provides Wire to Wire replacement of any potential relay with added motor protection.
Applications
• Replaces all OEM potential relays
• Used on any single phase motor or air conditioning and refrigeration compressor up to 5 hp.

Benefits
• Reduces Inventory
• Wire to Wire Replacement for virtually ALL
potential relays.
• Recycles instantly
• Replaces both 3 and 5 terminal potential relays
• Accomodates screw on or push on connections.
• Dimensions identical to industry standard
potential relays.
• Easy replacement mounting with universal
mounting bracket.
• Start winding protection if motor does not start.
• Prevents start capacitor venting, when
motor doesn’t start.





SUPR

The SUPR Universal Potential Relay is a time function potential relay designed to be a Wire to Wire replacement for virtually any potential relay on the market. It can be used on any single phase motor or air conditioning and refrigeration compressor up to 5 hp.


SUPR Specifications

Operating Voltage
110 – 270 VAC, Single Phase
Motor Power Rating
up to 5 hp
Start Time
0.5 +/- 0.1 seconds
Operating Position
Non-positional mounting.
Universal Mounting Bracket
Allows for easy installation.
Unused portions of the bracket simply snap-off with pliers.
Terminals Screw or push-on. Adapters to convert screw-on to push-on
are provided.



APR5

The APR5 Adjustable Potential Relay is an adjustable voltage sensitive, wire to wire universal replacement for virtually all potential relays on the market. Simply set the pick up voltage of the APR5 to that of the defective relay, or for unknown values, consult the APR5’s installation instructions. It can be used on any single phase motor or air conditioning and refrigeration hermetic compressor up


APR5 Specifications

Operating Voltage
110 – 270 VAC, Single Phase
Motor Power Rating
up to 5 hp
Safety Time Out
1.0 – 1.5 seconds
Operating Position
Non-positional mounting.
Universal Mounting Bracket
Allows for easy installation. Unused portions of the bracket simply snap-off with pliers.
Terminals Screw or push-on. Adapters to convert screw-on to push-on
are provided.



















SUPR & APR5
Universal Potential Relays




Replacing all potential relays, these WIRE TO WIRE Universal Potential Relays offer the ultimate in convenience. One potential relay to fit any application. Choose to “drop in” the SUPR Universal Potential Relay or “dial in” the exact pick up voltage for the APR5 Adjustable Potential Relay. State of the Art electronic circuitry provides Wire to Wire replacement of any potential relay with added motor protection.
Applications
• Replaces all OEM potential relays
• Used on any single phase motor or air conditioning and refrigeration compressor up to 5 hp.

Benefits
• Reduces Inventory
• Wire to Wire Replacement for virtually ALL
potential relays.
• Recycles instantly
• Replaces both 3 and 5 terminal potential relays
• Accomodates screw on or push on connections.
• Dimensions identical to industry standard
potential relays.
• Easy replacement mounting with universal
mounting bracket.
• Start winding protection if motor does not start.
• Prevents start capacitor venting, when
motor doesn’t start.





SUPR

The SUPR Universal Potential Relay is a time function potential relay designed to be a Wire to Wire replacement for virtually any potential relay on the market. It can be used on any single phase motor or air conditioning and refrigeration compressor up to 5 hp.


SUPR Specifications

Operating Voltage
110 – 270 VAC, Single Phase
Motor Power Rating
up to 5 hp
Start Time
0.5 +/- 0.1 seconds
Operating Position
Non-positional mounting.
Universal Mounting Bracket
Allows for easy installation.
Unused portions of the bracket simply snap-off with pliers.
Terminals Screw or push-on. Adapters to convert screw-on to push-on
are provided.



APR5

The APR5 Adjustable Potential Relay is an adjustable voltage sensitive, wire to wire universal replacement for virtually all potential relays on the market. Simply set the pick up voltage of the APR5 to that of the defective relay, or for unknown values, consult the APR5’s installation instructions. It can be used on any single phase motor or air conditioning and refrigeration hermetic compressor up


APR5 Specifications

Operating Voltage
110 – 270 VAC, Single Phase
Motor Power Rating
up to 5 hp
Safety Time Out
1.0 – 1.5 seconds
Operating Position
Non-positional mounting.
Universal Mounting Bracket
Allows for easy installation. Unused portions of the bracket simply snap-off with pliers.
Terminals Screw or push-on. Adapters to convert screw-on to push-on
are provided.

[wannafreeze]

Okey I went to my truck and read the SUPR again,it says up to 5 HP.I don't know why I remembered it 1 to 5 HP.
What's funny is,I discussed this with two supply house top guys in lenght.One says he will search why they don't cover 3/4 HP.The other one says 3/4 HP is not as common as others that's why they(Supco and others) would't design anything for 3/4 HP.It's not business-wise etc.So bottom line is I remembered something wrong,and these two supply house guys don't know what they are selling,one even BSted me.
A third famous supply house didn't even know what a universal pot relay was.
It just reminds me the time I was asking every supply house about the fitting for hooking gauges to ice machines without hoses.None of them knew what I was talking about.:eek:
Purge(and icehouse), you were right.thanks.

[purge]

How are the settings adjusted on these controls

The spec sheets that icehouse posted no doubt answer most of concerns, but here is some additional info:

The SUPR is a universal potential relay that has factory set pick-up voltage, so there is no adjustment on that one.
The APR5 on the other hand has a small adjustment screw on it, which varies the pick-up voltage from 130v-370v in 30v increments. If you know the pick-up voltage on the relay you are replacing, you can set it to match. If you don’t know the value on the old relay, Supco recommends you use a setting of 180 for 110-120v motors or 310 for 208-240v motors. According to Supco, these pick-up settings will work for most 110v to 270v single split-phase and hermetic motors up to motors up to 5 HP.
Supco also says you can verify or fine-tune the adjustments if needed by watching needle bounce with an analog ammeter, but I personally haven’t owned an analog ammeter for at least 15 years now. This relay include an internal “timing” circuit so that if either the motor fails to start or the pick-up voltage is set to high and isn’t met, the start winding is disconnected from the circuit to prevent damage. The price is about the same for either relay and I will normally use the universal SUPR relay, but keep a few of the adjustable APR5 on hand just in case they are needed.

[icehouse]

Okey I went to my truck and read the SUPR again,it says up to 5 HP.I don't know why I remembered it 1 to 5 HP.
What's funny is,I discussed this with two supply house top guys in lenght.One says he will search why they don't cover 3/4 HP.The other one says 3/4 HP is not as common as others that's why they(Supco and others) would't design anything for 3/4 HP.It's not business-wise etc.So bottom line is I remembered something wrong,and these two supply house guys don't know what they are selling,one even BSted me.
A third famous supply house didn't even know what a universal pot relay was.
It just reminds me the time I was asking every supply house about the fitting for hooking gauges to ice machines without hoses.None of them knew what I was talking about.:eek:
Purge(and icehouse), you were right.thanks.
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(Store# 60)
27-01 Brooklyn-Queens Expswy West
Woodside, NY 11377-7817
Phone:(718) 545-4896
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Online Catalog-> Refrigeration & Air Conditioning-> Components-> Compressor Electrical Components->




3-Wire Hard Starts



FIG

Catalog Page: 1181



Combination potential relay and start capacitor

For use on any single-phase air conditioning and refrigeration unit

Instant re-start

Easy installation with “fast clamp-on” connection

Start capacitor voltage: 330VAC








Item # Mfg. # Max. Operating Voltage (VAC) Compressor Recommended Range Capacitance Mfd
B14-339 SK3W2 500 Standard 1–2 HP 88–108
B14-340 SK3W3 420 Standard 2-1/2–3-1/2 HP 189–227
B14-341 SK3W5 420 Standard 4–5 HP 243–292
B14-342 SK3W4S 500 Scroll 3–4 HP 189–227
B14-343 SK3W6S 420 Scroll 4-1/2–6 HP 270–324 :D









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