Magikist HWG20, Инструкция по эксплуатации, Страница: 18 / 28

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9.1 FLOW SWITCH (MODEL HPFS38)
On heaters where the mineral content of the water
is high or where chemicals or soaps are used, it
may be necessary on occasion to
disassemble the housing
and clean any debris and
build up inside the flow
switch. This maintenance
will allow the magnet to
continue to move smoothly
and freely, and will
eliminate nuisance failures
due to scale buildup. It is
suggested that the flow
switch be inspected and
cleaned as necessary
each time the heater (or
possibly the high pressure
pump) receives routine
maintenance or service.
To adjust the flow switch, the reed switch will need
to be repositioned. The reed switch is housed
inside the cylindrical metal can from which the
jacketed wire comes out. To reposition the reed
switch loosen the friction bolt/nut and slide the
cylindrical metal can in or out such that the FLOW
indicator is on when there is flow and off when
there is no flow through the switch. Retighten the
friction bolt/nut to secure the position of the reed
switch.
9.2 RELIGHTING THE PILOT BURNER
(STANDING PILOT HEATERS ONLY)
CAUTION: Should pilot outage occur, wait 5
minutes before relighting to clear combustion
chamber of accumulated gas. If an automatic
vent damper is installed, you must also move
the service switch on the motor housing of the
vent damper to “HOLD DAMPER OPEN”
position and wait 5 minutes before relighting
(return switch to “AUTOMATIC OPERATION”
once relighting procedure is complete).
Because LP (propane) gas is heavier than air,
heaters utilizing these gases should have the
floor areas vented and blown clear before
relighting the pilot.
WARNING:
IF YOU SMELL GAS, SHUT OFF THE GAS
SUPPLY TO THE APPLIANCE AND
EXTINGUISH ANY OPEN FLAME. IF THE
ODOUR PERSISTS, CALL YOUR GAS
INSTALLER IMMEDIATELY.
ADVERTISSEMENT
:
SI UNE ODEUR DE GAZ EST DÉCELÉE,
COUPER L’ALIMENTATION EN GAZ DE
L’APPAREIL ET ÉTEINDRE TOUTES LES
FLAMMES. SI L’ODEUR PERSISTE, AVERTIR
IMMÉDIATEMENT LE FOURNISSEUR DE GAZ.
Should pilot outage occur, refer to section 5.5
LIGHTING THE PILOT BURNER for instructions
on relighting the pilot burner.
9.3 CARE OF MAIN BURNERS
Due to condensation from heater coils dripping on
the burners, a scale build-up may occur in the
burner jet orifices.
To remove the burner bar from the heater, turn off
the gas to the heater by turning the knob on the
gas valve to the “off” position. For standing pilot
heaters, disconnect the pilot tube and
thermocouple at the gas valve. For electronic
ignition heaters, disconnect the pilot tube and the
electrical connections between the pilot assembly
and the electronic ignition module (take care to
note the connections so that they may be
reconnected correctly). Disconnect the union
joining the burner bar to the modulating gas valve,
and the U-bolt retaining the feed pipe at the
bottom of the heater inside the door. Slide the
burner bar out through the shell opening.
To clean burner jets select the proper size drill for
type of gas involved. Use a pin vise to hold the
drill and ream out each jet orifice by hand. It is
recommended that the burner jets not be removed
from the burner bar except for jets that require
replacing.
Do not ream out orifices to a larger
size than shown.
HWG40:
#55 drill for natural gas 0-2000ft. (0-610 m)
#56 drill for natural gas 2000-4000ft. (610-1370 m)
#68 drill for LP gas 0-2000ft. (0-610 m)
#70 drill for LP gas 2000-4000ft. (610-1370 m)
HWG20
#52 drill for natural gas 0-2000ft. (0-610 m)
#53 drill for natural gas 2000-4000ft. (610-1370 m)
#63 drill for LP gas 0-2000ft. (0-610 m)
#64 drill for LP gas 2000-4000ft. (610-1370 m)
9.4 CLEANING HEATER COIL OF SCALE
Excessive scale in heater coils can reduce the
recovery rate of the heater and restrict the flow of
water through the heater. Use of hard water
through the heater tends to accelerate scale build-
up. Should heater coils develop excessive scale
build-up it may be necessary to use a coil cleaner
to remove the scale build-up. Use only an
approved coil cleaner specially designed for
cleaning scale and mineral deposits from steel
coils, such as Magikist
M
AGIK
C
OIL
de-liming acid.
To clean the heater coil of scale build-up, follow
the directions provided with the coil cleaner. Never
allow the coil cleaner to sit in the coil overnight or
for long periods of time. Always flush out the coil
thoroughly with water after cleaning.
9.0 MAINTENANCE
Figure 9.1.1