If this is confusing please see the "How does...2 speed motor work thread"
Thanks for the initial lesson. I am trying to fill in the blanks and
learn so that I can use my spa for years to come.
1) The new motor is totally sealed as was the old. The plate on the new
motor says Type = CSM. I assume this stands for Continuos Service Motor?
Time = CONT I assume this is short for continuous?
2) The plate on the new motor also says: ENCL = DP, Form = PHM, Code = A,
Insulation Class = B, AMB = 40 degrees C Are these important? Can you
educate me on any of these that are.
3) On the new motor it says HP = 1.5 SPL If SPL is important, what is it?
4) For my knowledge/understanding; What is changed to make my motor run at
high speed (looking at it, the coils and windings look the same as a single
speed motor)? The thermostat turns the pump on low when it senses heat is
needed. High is only achieved by pushing a button on the user control panel
on top of the spa. But what changes to make the motor run on high. When I
wired it I connected red (low speed), black (high speed), white (common) and
green (ground) wires. Yet the old a new motors clearly say they are 110
volts. I used to think changing the voltage or do I mean amps? (e.g.
electricity flowed through just the red wire on low, 110 volts, and both the
red and black wire, 220 volts, on high) changed the speed but now assume I
was very wrong on this. Could you correct my thinking on this please.
5) If I understand you correctly, even though the plate on both motors says
1.5 horsepower, my new 110volt motor gets 11% less HP than my old because
the amps is lower, 3.1 on new, 3.46 on old? I assume there is an equation
for this, may I know it? (3.46 - 3.1) / 3.1 = .11 Is that the equation?
6) I understand you when you say Power factor is the ability to run at above
the stated horse power for a long period of time. If the factor is say 1.25
. You can get 25% more horse
One thing, power factor is always less than 1.
Because most electrical load is inductive.
I don't want to get into math for this.
AMB = 40 deg. C ~104 deg. F. So the motor shouldn't run in ambient temp.
higher than 104 deg. F.
One Hp is approx. 750 Watts. When PF(power factor) is applied it can be
lot more than 750 Watts.
ENCL=DP: drip proof; CODE =A: Locked Rotor Indicating Letter, Inrush current
(when an AC motor starts up it draws more current than rated) A means
current draw in KVA/hp is 0 to 3.14 amps and mid range is 1.6 amps.
INSULATION CLASS = B : Temp can't exceed 105 deg C; AMB@deg C I think
means that the ambient temp can't exceed 40 deg C or 104 deg F, also the
insulation absorbs water (do not use outside).
Calculate the % diff in HP: new HP-old HP/old HP (3.1-3.46)/3.46 = -10.4 %
or 10.4% loss
Power factor, loosely defined, is the efficiency of a circuit. You can't
have a power factor greater than 1. Power factor is calculated or measured
in several ways. One is (watts /volt-amperes). You need a voltmeter,
ammeter and a watt meter. Generally the smaller the motor the lower the
That's all I know from my Coasty days as an electrician's mate 40 years ago.
you remind me of me. . .Hey docc holliday saiid that in tombstone. .. i will
ask an infinite # of questions about things i don't know. . 3.1 meansd yyour
knew motor is more efficient, it's using less electricity to perform = to the
other one. As for how does the moter change speeds. .
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