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Tiger river spa Sumatran , not heating/low flow

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Hi all 

we have recently acquired a tiger river Sumatran spa .  It did not heat up , found heater relays faulty .

new relays still no heat, main board is calling for heat . The heater has power and it looks like an upgrade as the pressure switch has been bypassed as this heater does not have a cable to connect pressure switch.

circ pump is getting hot so opened each pipe in turn inside the panel to bled through any air locks that might be present . Pump is working as checked flow through again by removing pipe and flicking the pump on .Still no heat . 
 

I cannot see or feel any suction from within the filter chamber when just on circulation. Very little coming out of return to the spa from sump. 
 

thanks in advance

update - with the jets running we have gone from 30 degrees C to 34 degrees C . Would this indicate a flow problem with the circulation.. 

thanks 

Edited by REA
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Hi RDSpaguy

ive removed the filter still no flow . I’ve taken the delivery pipe off the heater to see if circ pump is running , which it is . 
 

I’m going to move the suction pipe into the spa water directly and see if I have a blockage on the suction side , same on delivery if required . 
 

but just because the pump is working smdoes not mean it’s working at it’s full capacity 

I’ll let you know what I find 

thanks 

 

 

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Rdspaguy

new circ pump fitted , visually better flow but not what I would expect .

should I be able to feel suction in the filter chamber ? As I cannot ! 
 

thanks 

 

 

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You should feel a little at the intake pipe for the circ pump filter if yours has multiple filters. If it has a single filter you may not be able to feel it.

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The circulation pumps don't move a lot of water, maybe 7-10 gallons per minute.  You're not going to feel much if any suction.  Is there enough flow so that the heater is turning on?

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Castletonia 

its a new circ pump , the uograded e4/5 if I remember. Only fitted 2 days ago .

how can I measure flow ? I’d say not if we can heat the spa when jet pump is on . How can I check flow rate ? These don’t have flow sensor, and the heater is the newer type with the pressure sensor not required so it has a jumper fitted to the main board .

thanks 

Russell 

 

how can I test flow to

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The below pic is the wiring inside the heater housing . 
on my one the highlighted wire is not connected .... is this due to the pressure switch bypass ? I’m going to assume that this should be connected , unless you guys know any better ...

 

thanks 

Russell

0F04ADA4-BF1F-440B-8B8C-440CB8510E19.jpeg

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Hi guys 

just been going through everything again to ensure I had not missed anything.

the heater I have is a 1.5kw on a 240v system .. found below info ...not sure if this is correct as suppliers of these heaters only seem to have the 1.5kw model 

thanks 

Russell7D65C152-8B14-47BA-8AA9-917EB733D62B.thumb.png.29c1a7128d49387c1cee51efe4f7b7f5.png

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Does the hot tub heat up?  If it can heat up to temp then the heater is working.  If this is a 115/230 convertible hot tub the heater should run at 1.5kW on 115 volt and 6kW on 230V.

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Castletonia 

The tub heats up if I run the jet pump, but not if I just run the filtration. 
The current heater is a 1.5kw but as you state the o &m states it should be 6kw for a 240v system . Does the heater run at diff kw depending on if it’s 115v or 240v ? 

just trying to be 100% sure before as heaters are expensive 

stupid question .. I’m running the spa off a standard 240v supply from the house ...can this be a problem? Do I need a dedicated supply from the board? 

 

thanks 

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If anyone out there has or knows someone with the Sumatran hot tub , please can you confirm which voltage and which kw heater please ? 
 

many thanks 

Russell 

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Ok. Basic electrical theory.

Volts = amps x ohms

Watts = volts x amps

Resistance (ohms) is fixed, built in the heater at 10 ohms. So if we do the math...

115 volts = amps x 10, so 11.5 amps. 115 volts x 11.5 amps = 1,322.5 watts rounded off to 1.5kw.

230 volts = amps x 10, so 23 amps. 230 volts x 23 amps = 5,290 watts rounded off to 5.5kw. 

Same heater, different voltages. There is no spa heater that I know of that is 1.5kw at 230 volts.

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RDspaguy

thank you for the education , makes perfect sense .

ill keep you posted on the results 

regards 

Russell 

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16 minutes ago, RDspaguy said:

There is no spa heater that I know of that is 1.5kw at 230 volts.

Not related to the OP's post but just to pass along some mindless jibber jabber for @RDspaguy.Coast Spas use to do a dual heater elements the ran 230 with 4 KW on one and 1 KW on the other. https://www.poolandhottubdepot.com/tspa-mp-replacement-board/

C2500-3600ET-G - Coast/Gecko Spa Heater Assembly Dual Element 4.0kW 240 Volt

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Ok. It sure reads that way.

You say it heats with the pump on, how fast? If the heater is in fact turning on when the pump runs then the heater is not the issue. My money is on the circulation pump. Are there any flashing indicator lights or error codes on the display? Post a pic of the equipment area including the pumps and circuit board. 

 

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RDspaguy

Yes it heats when the jet pump is on and wil hold temp on normal circ. I replaced the circ pump last well with the upgraded pump .

Ill post pics of pumps etc later 

thanks 

71F7D491-3766-44C6-813A-BA8B4A5D23AA.jpeg

6DD18514-590F-42CF-BCC1-FDD838AC2B3B.jpeg

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On 9/1/2020 at 1:15 AM, RDspaguy said:

Remove the filters. If flow does not improve you probably need a new circulation pump.

did you do this? leave filter out until issue is fixed

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CandianSpaTech

I removed filter and left for an hour, no change .

ill leave it out over night see it f it makes any difference. Worth trying again 

 

Russell 

 

 

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Ok. You said you are using a 240v supply, but your wiring at the spa is set up for 120v. On the inside of the box cover is a wiring diagram, please post a pic of it as well.

Do you have a voltmeter or mutimeter?

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RDspaguy 

Ok ... I will take a pic tomorrow after work .

Yes  I have a multi meter .

Thanks 

Russell 

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RDspaguy

So the plug and play , so to speak I was told by the previous owners spa tech ...could actually mean I need the following ? 

Thanks 

Russell 

D7FB1F80-3091-46C0-AE14-24F8CA6EC357.png

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