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IMPORTANT: Your heat pump or gas heater must have
all the flow and temperature limit protections.
Your heat pump or gas heater must be connected to
your Y series hot tub control system. Make sure to al-
ways connect your external heating system in the same
water pipe filter of your hot tub control system heater
(as illustrated above).
The unit must be installed after your hot tub control
system (as illustrated above).
You need to be sure your pump heater or gas heater is
set to the maximum set point temperature. Your water
temperature regulation will be controlled with your hot
tub control system, by adjusting the set point on the
hot tub keypad.
The in.grid dry contact should be hooked to the input
for wire remote temperature control of the external
heating system. Your voltage must be below 24 V.
If the in.grid controls are used with a gas heater, the
remote temperature control input is usually called “fire-
man's switch”.
Please make sure your heat exchange does not have a flow
restriction. The heater in your Y series hot tub control system
needs a minimum of 20 GPM all the time.
Make sure to always connect your heat exchange unit in the
same water pipe filter of your Y series hot tub control system
heater.
The dry contact of the in.grid must only control a low voltage
line and is used to power a low voltage relay coil. Use a relay
driver to power up the auxiliary pump low voltage.
OPTIONAL ACCESSORIES IN.GRID
INSTALLATION WITH EXTERNAL HEAT PUMP OR GAS HEATER
Hot tub control
system
Pump heater or
gas heater
Hot tub circulation/
main pump
in.grid
INSTALLATION WITH A HEAT EXCHANGE UNIT
12V
+
-
.
Hot tub return
Hot tub pack
Central
heating
Heat
exchange
in.grid
Relay driver
To hot tub
240Vac
50/60Hz
Auxiliary pump
Hot tub circula-
tion/ main pump
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