Hot Tub Breaker Sizeby Admin
25
Jul 2013


Message: What size circuit breaker is required for the Balboa VS520 retrofit kit?

Dated on : 05-30-2012



 

 

Replies :

40 amp for full power but their is a lower power option where by the heater won't kick on if the jets are in hi mode.  This option only requires 30 Amps. Dan    

Post By : Dan Jung Dated On : 05-30-2012

 

I believe we discussed this on the phone. In high current mode add up currents of the pumps and blower and the heater (23A) and add 25%. In low current mode 30Amps. Dieter Sent from my BlackBerry? smartphone on the MTS High Speed Mobility Network -----Original Message----- From: cedartubsdirect Date: Wed, 30 May 2012 15:25:25 To: Subject: [CTT: #885] A new ticket assigned for you from - cedartubsdirect Hi Dieter Jung., An user opened a ticket in cedartubsdirect Issue Id# 885 Name Doug C. Schick Email [email protected] Subject breaker size Type Technical Message What size circuit?breaker?is required for the VS520 retrofit kit? Click Here to Reply or View this Thread. Thanks,cedartubsdirect

Post By : Dan Jung Dated On : 05-31-2012

 

Just following up, from the message I sent via the Blackberry yesterday.  Say you had two jet pumps (11/2.9  Amp each) and circulation pump (1.1 Amp) and a Blower (5.0 Amp).  Table on inside cover shows how many high current devices can be on and the heater (which draws 23 Amps ) will still come on. A2      A10     # of high current motors that can be on OFF   OFF     0 ON     OFF     1 OFF    ON      2 ON      ON      3 So if A2 and A10 where both off, you are in low current mode.  Worst case scenario is ( if Jet pumps are 2-speed and in low speed both are on and they draw in the example 2.9 Amps).  In this case with both Jet pumps on in low speed the maximum current drawn would be: 23 A (heater) + 2 x 2.9A (jet pumps low speed) + 1.1 A ( circ pump) = 29.9 A.  You need a 25% margin in selecting the circuit breaker, so you end up needing a  to select  a 40  Amp breaker and #8/2C cable. If the Jet pumps were only 1 speed,  then the maximum current when heater is allowed to be on, in the above off off settings is 23 + 1.1 = 24.1 Amps.  However this in my example with Jet pumps drawing 11 Amps wouldn't be the worst case. Worst case has both Jet pumps in high speed, the blower on, and the circulation pump on (heater is locked out).  2 x 11 + 5 + 1.1 = 27.1Amp.  With   the 25% margin you would be over 30 Amp,  If your pump motors draw less than 11 AMP such as 8.9 Amps you would be okay.  I don't know what you actually have and you need to make the calculation. As you allow one or more high current motors to come on , you increase the maximum current draw.  With 1 high speed device on you would need 40 Amp circuit breaker.  With 3 devices allowed on in their high current mode, you could with my example, draw over 50 Amps and would need a 60 Amp circuit breaker.  Dieter  

Post By : Dieter Jung Dated On : 06-01-2012

 

So with A2 and A10 off you can go with 30AMP GFCI breaker. If you want to allow the heater to come on with all motors running you could probably still get buy with a 50Amp service.  If you reduce the number of motors that can be on at one time to 1 and still have the heater come on, then you can get by with 40 Amp service.   Yes the VS520SZ can handle all your motors.  The draw of the ozonator is insignificant.  However also check your motor voltages.  The circulation pump and ozonator need to have the same voltage.  What voltage is produced at the plugs is determined by a field selectable jumper.   Dieter

Post By : Dieter Jung Dated On : 06-01-2012

 

So with A2 and A10 off you can go with 30AMP GFCI breaker.If you want to allow the heater to come on with all motors running you could probably still get buy with a 50Amp service.  If you reduce the number of motors that can be on at one time to 1 and still have the heater come on, then you can get by with 40 Amp service. Yes the VS520SZ can handle all your motors.  The draw of the ozonator is insignificant.  However also check your motor voltages.  The circulation pump and ozonator need to have the same voltage.  What voltage is produced at the plugs is determined by a field selectable jumper. Dieter 

Post By : Dieter Jung Dated On : 06-01-2012

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