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INST 396 Jacuzzi® J-HN Series Heater V12-16
WATER PRESSURE SWITCH ADJUSTMENT
The Jacuzzi® J-HN Series Pool Heater incorporates a water pressure switch which allows the burner to operate only when the
circulating pump is operating. The pressure switch is designed to operate with the heater installed up to 10’ feet above or below
the surface level of the pool or spa.
It is imperative that the following be undertaken by the person who is commissioning (first starting) your pool or spa heater. On
initial start-up of the heater it may be necessary to adjust the water pressure activation switch.
This switch is located on the inlet / outlet header. The pressure switch is a safety device, designed to allow operation of the heater
only when the circulating pump is on and there is sufficient water flow through the heater. It must shut the heater down
immediately after the pump is switched off.
TO CHECK THE OPERATION OF THE SWITCH:
1. Check water pump hair and lint basket is clean and free of debris and backwash sand filter or clean cartridge filter. Pressure
switch should only be check and adjusted with clean skimmer, pump basket and filter.
2. Connect the heater to mains power supply and turn power on. The thermostat should not yet display “θ”.
3. Turn on pump. The thermostat should now display “θ”.
4. Turn pump off. The thermostat should no longer display “θ”.
5. If display does not respond in this way, adjust the pressure switch as detailed below. If display responds correctly, perform a
final check with the heater operating – see the section below titled “Starting the heater”.
TO ADJUST PRESSURE SWITCH:
1. Connect the heater to mains power supply and turn power on. The thermostat should not yet display “θ”.
2. Turn on pump.
3. View the display of the heater to confirm the “θ” has appeared on the LCD display on front of heater.
4. If no symbol is present, slide the toggle up to allow adjustment, then rotate knurled wheel anti clockwise (as viewed from
above) until “θ” is displayed.
5. Switch pump off.
6. View LCD display to confirm the “θ” has disappeared.
7. If “θ” symbol is present when pump is OFF or “θ” does not disappear within 1 (one) second of pump turning off, the pressure
switch must be adjusted.
8. With Pump turned OFF, turn knurled wheel clockwise to increase the pressure required to activate the switch.
9. Repeat steps 2 to 8 until symbol appears and disappears when pump turns on and off.
10. When the pressure switch is correctly set, slide the toggle down to lock the knurled wheel in position.
11. If pressure switch cannot be made to activate heater when pump is turned on and off, a flow switch may need to be purchased
and fitted. Contact your local Astral Pool office for details.
WARNING
: If the pressure switch cannot be adjusted correctly, DO NOT OPERATE THE HEATER, contact www.Jacuzzipool.com or an
Authorized Service Agent for advice.
1. Perform a final check with the heater operating.
It is imperative that the heater is installed so that it
does not operate when the circulating pump stops.
Recommended methods to achieve this are:
a) Correct adjustment of internal pressure
switch. Ensure heater does not turn on two
or three minutes after circulating pump is
turned off.
b) Installation of an external flow switch may be
preferred under certain installations where
internal pressure switch does not turn heater
off when circulator stops.
PRESSURE SWITCH ADJUSTMENT
TO ALLOW
ADJUSTMENT
DIRECTION OF
ARROW TO
DECREASE
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