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whl-648 Rev. 000 Rel. 003 Date 3.6.18
7
D. When Servicing the Appliance
tTo avoid electric shock, disconnect electrical supply before
performing maintenance.
tTo avoid severe burns, allow appliance and associated
equipment to cool before servicing.
tDo not use petroleum-based cleaning or sealing compounds
in an appliance system. Gaskets and seals in the system may
be damaged. This can result in substantial property damage.
tDo not use “homemade cures” or “patent medicines”.
Damage to the appliance, substantial property damage,
and/or serious personal injury may result.
tAlways verify proper operation after servicing the appliance.
NOTE: When inquiring about service or troubleshooting, reference
the model and serial numbers from the appliance rating label.
Be sure to disconnect electrical power before opening appliance
cabinet or performing service. Label all wires while performing
service to ensure proper re-wiring of the appliance. Wiring errors
can cause improper or dangerous operation. Failure to do so
could result in an electrical shock, improper appliance operation,
property damage, serious personal injury, or death.
F. Water Chemistry Requirements
Chemical imbalance of the water supply may aect eciency and
cause severe damage to the appliance and associated equipment.
Water quality must be professionally analyzed to determine
whether it is necessary to treat the water. Various solutions are
available to adjust water quality. Adverse water quality will aect
the reliability of the system. In addition, operating temperatures
above 135
o
F will accelerate the build-up of lime scale and possibly
shorten appliance service life. Failure of an appliance due to
lime scale build-up, low pH, or other chemical imbalance IS NOT
covered by the warranty.
The water must be potable, free of corrosive chemicals, sand,
dirt, and other contaminates. It is up to the installer to ensure the
water does not contain corrosive chemicals or elements that can
damage the heat exchanger. Potable water is dened as drinkable
water supplied from utility or well water in compliance with EPA
secondary maximum contaminant levels (40 CFR Part 143.3). If
the water contains contaminants higher than outlined by the EPA,
water treatment is recommended and additional, more frequent
maintenance may be required. See Table 1.
Contaminant Maximum Allowable Level
Total Hardness
(Residential Use - Below 140
o
F
water temperature)
200 mg/l
(12 grains/gallon)
Total Hardness
(Commercial Use - Above 140
o
F
water temperature)
120 mg/l
(7 grains/gallon)
Aluminum 0.05 to 0.2 mg/l or PPM
Chloride 100 mg/l or PPM
Copper 1 mg/l or PPM
Iron 0.3 mg/l or PPM
Manganese 0.05 mg/l or PPM
pH 6.5 - 8.5
Sulfate 205 mg/l or PPM
Total Dissolved Solids (TDS) 500 mg/l or PPM
Zinc 5 mg/l or PPM
Dissolved Carbon Dioxide (CO2) 15 mg/l or PPM
Table 1 - Water Quality Specications
G. Freeze Protection
The appliance control is equipped with freeze protection that activates
based on internal water temperature. See the table below for details
on freeze protection operation.
NOTE: Freeze protection will not be active if the appliance loses power.
Consider piping and installation when determining appliance
location. Damages resulting from incorrect installation or from use
of products not approved by the manufacturer ARE NOT covered by
warranty.
NEVER use any toxic chemical, including automotive, standard glycol
antifreeze, or ethylene glycol made for hydronic (non-potable)
systems. These chemicals can attack gaskets and seals in water
systems, are poisonous if consumed, and can cause personal injury
or death.
System
Freeze
Protection
(Activates
Based on
Internal
Water
Temperature)
Freeze Protection Operation Range
Stage 1 - If control detects water
temperature of 46
o
F (8
o
C) and below, it
turns the internal and external pumps
On for 600 seconds and O for 30
seconds. This cycle repeats until the
control detects inlet water temperature
of 50
o
F (10
o
C) and above.
ON or OFF
(Default: ON)
NOTE:
If using
appliance for
Snow Melt
applications,
turn Freeze
Protection
OFF.
Stage 2 - If control detects water
temperature of 41
o
F (5
o
C) and below,
it turns the burner on to meet a target
temperature of 104
o
F (40
o
C). The burner
and internal and external pumps will
continuously during this stage until the
control detects inlet water temperature
of 104
o
F (40
o
C) and above.
Stage 3 - If control detects water
temperature of 34
o
F (1
o
C) and below,
Er: 85 will appear on the display.
Table 2 - Freeze Protection Detail
E. Appliance System
tThoroughly ush the system (without the appliance
connected) to remove sediment. The high eciency heat
exchanger can be damaged by build-up or corrosion due to
sediment. The manufacturer recommends a suction strainer
in all systems.
tDo not use petroleum-based cleaning or sealing compounds
in a appliance system. Gaskets and seals in the system may
be damaged. This can result in substantial property damage.
tDo not use “homemade cures” or “patent medicines”.
Damage to the appliance, substantial property damage,
and/or serious personal injury may result.
Continual fresh make-up water will reduce appliance life. Mineral
buildup in the heat exchanger reduces heat transfer, overheats
the stainless steel heat exchanger, and causes failure. Addition of
oxygen from make-up water can cause internal corrosion in system
components. Leaks in the appliance or piping must be repaired at
once.
If you suspect that your water is contaminated in any way, discontinue
use of the appliance and contact an authorized technician or licensed
professional.
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