7:4 PRESSURE SWITCH
The pressure switch, ensures that the heater
operates only when the filter pump is in operation. It
is factory set at 0.12 bar (1.75 PSI) for deck level
installations. When the heater is located below the
level of the spa or pool, it may be necessary to reset
the pressure switch to compensate for the no-flow
static head. If it is necessary to reset the pressure
switch, we recommend the following procedure:
PRESSURE SWITCH ADJUSTMENT
1. With pump and heater on, turn adjustment
knob (clockwise) until a click is heard
from the gas valve.
2. Turn adjustment knob
(counter clockwise)
1/4 turn.
3. Turn pump off and on several times.
Heater should shut off immediately. If it does
not, repeat steps above until proper adjust
ments is made.
Adjustment
Knob
NOTE:
If heater is installed outside of the limits
shown below, a flow switch must be used in place of
the pressure switch when mounted and wired adja-
cent to the heater.
TWO SPEED PUMPS
In some cases, the flow on the low speed is insuffi-
cient to operate the heater. This is apparent when
the pressure switch cannot be further adjusted or if
the heater makes banging noises. In these cases,
the pump must be run at high speed when heating
the water.
CAUTION:
Do not operate the heater without the
functionof a properly adjusted pressure switch or
flow switch.
7:5 RESPONSIBILITY
It is the responsibility of the Installer to ensure that
the Heater is properly commissioned. It is essential
that the commissioning procedures detailed in this
manual are carried out by a qualified engineer us-
ing recognised test equipment.
It is recommended that the relevant section of BS
5410: Part 1: latest edition is carefully read.
7:6 REPORTING
It is recommended that you use a report sheet and
check list. Make comments on the report where nec-
essary, and give a copy to whoever has engaged
your services, and retain and file your own copy. A
suggested layout is shown over.
1.5 m Max
1.5 m Max
range.tif
It is the responsibility of the
Installer to ensure that the Heater is
commissioned by an OFTEC
Registered Commissioning Engineer.
9-04-02
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