How do I limit the power that my spa draws from pumps and the heater?

Please review the information and instructions below on (C.LMT) current limit:


How to govern the heater’s power draw:

Every SV controller features a variable heater so the amount of power supplied to the heater can be adjusted. This is particularly helpful because it enables the SV controller to automatically reduce the size (kW) of the heater when the pumps and/or blower are running, so that the spa’s power draw stays within the limits of the circuit breaker feeding the spa, but also ensures the maximum amount of heating input to the spa whilst in use. Traditionally spa heaters were a fixed size (kW) and would usually be “load shed” and turned OFF completely when pumps/blowers were operating.


The variable heater feature also enable’s the heater size to be governed to a certain limit if the available power (amps) feeding the spa is limited. PLEASE NOTE: The C.LMT (current limit) setting ONLY effects the power draw from the heater. It does not govern or restrict the amount of power that the pumps or blower use.


The default C.LMT (current limit) settings for the SV controller models are:

MODEL C.LMT (default)

SV2-VH  15 amp
SV3-VH  32 amp
SV4-VH  40 amp

In some spa installations the amount of available power (amps) for a spa circuit may be limited.
i.e. the recommended power to be supplied to the spa is 32A however only 20A is available at the
property. In this case the installer should adjust the C.LMT setting to match the rating of the
circuit breaker feeding the spa. i.e. adjust C.LMT=20A

How to program the current limit (C.LMT):

1.LLM (load limit)
How to govern number of loads that operate at once

In some spa installations the amount of available power (amps) for a spa circuit may be limited.
i.e. the recommended power to be supplied to the spa is 32A however only 20A is available at the
property. In this case the installer should adjust the C.LMT setting to match the rating of the
circuit breaker feeding the spa. i.e. adjust C.LMT=20A (please refer previous page). This process
ensures the heater size is governed, however it DOES NOT prevent the combined total power draw
of the jet pumps and blower when running from exceeding the circuit breaker limit.


The power draw (amps) of a jet pump or blower cannot be adjusted. Pump or blower motors are a
certain size and must maintain a certain RPM, so their current draw is fixed. They will always draw
around the same amount of power (amps) when running (assuming voltage and head pressure are fixed). If the available power (amps) for a spa circuit is limited, the installer must consider how much current (amps) each jet pump and/or blower will use and where required must adjust the 1.LLM (load limit) setting to restrict the number of loads that operate at the one time, to keep the total power draw of the spa within the circuit breaker limits.


Each jet pump and blower is considered a load. The filtration pump is NOT considered a load. The
load limit setting (1.LLM) governs how many loads can be turned on at the same time. (i.e. If
1.LLM= 2, only two loads can operate simultaneously. E.g. 2 x jet pumps could be operated
together OR 1 x jet pump and 1 x blower, but if you tried to turn on 3 x jet pumps or 2 x jet
pumps + blower, the third device would NOT be allowed to turn on to keep the power draw to a
certain limit. One jet pump or blower would have to be turned off before the other load could be
turned on).


A rough guide of the power (amp) draw for equipment running on a spa pool is as follows:

* The circulation pump is the filtration pump and is therefore NOT considered a load and will NOT be governed by the 1.LLM (load limit) setting, HOWEVER you must take into account its power draw when calculating how much power the jet pumps and blower will use. The circ pump will ALWAYS run if a jet pump is operating.


Once you have considered the available power feeding the spa (i.e. 10A/15A/25A/32A/40A/45A)
and how many loads (i.e. jet pumps and blower) can operate together before exceeding the spa
circuit breaker limit you must adjust the load limit (1.LLM) setting. Refer below:

How to adjust the load limit (1.LLM):

Click below to download the SpaNet Current Limit Instructions:

 Image result for click here to download

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