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AP18733 REV. 3.2.17
17
▪ D. WHEN SERVICING THE WATER HEATER
• To avoid electric shock, disconnect electrical supply before performing maintenance.
• To avoid severe burns, allow water heater to cool.
• Do not use petroleum-based cleaning or sealing compounds in a water heater system. Gaskets and seals in the system may be damaged,
possibly resulting in substantial property damage.
• Do not use “homemade cures” or “patent medicines”. Substantial property damage, damage to water heater, and/or serious personal injury may result.
• Always verify proper operation after servicing the water heater.
IMPORTANT
Chemical imbalance of the water supply may affect efciency 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 affect the reliability of the system. In addition, operating temperatures above 135
°
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.
▪ E. WATER CHEMISTRY REQUIREMENTS
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) as shown in the table below. If the water contains
contaminants higher than outlined by the EPA, water treatment is recommended and additional, more frequent maintenance may be required.
If you suspect that your water is contaminated in any way, discontinue use of the appliance and contact an authorized technician or licensed
professional.
NOTE: Damages resulting from incorrect installation or from use of products not approved by Rheem ARE NOT covered by warranty.
The water heater 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 water heater loses power.
System Freeze Protection
(Activates Based on Internal Water
Temperature)
Freeze Protection Operation
Stage 1 – If control detects water temperature of 46
°
F (8
°
C) and below, the internal pump cycles until the
control detects return water temperature of 50
°
F (10
°
C) and above.
Stage 2 – If control detects water temperature of 41
°
F (5
°
C) and below, the burner and internal pump will
run continuously until the control detects return water temperature of 104
°
F (40
°
C) and above.
Contaminant Maximum Allowable Level Contaminant Maximum Allowable Level
Total Hardness
(Residential Use - Below 140°F
water temperature)
200 mg/l
(12 grains/gallon) pH 6.5-8.5
Total Hardness
(Commercial Use - 140°F and
above water temperature)
120 mg/l Sulfate 205 mg/l
Aluminum 0.05 to 0.2 mg/l Total Dissolved Solids (TDS) 500 mg/l
Chloride 100 mg/l Zinc 5 mg/l
Manganese 0.05 mg/l Dissolved Carbon Dioxide (CO
2
) 15 mg/l or PPM
IMPORTANT
Consider water heater piping and installation when determining water heater location.
▪ F. FREEZE PROTECTION
Table 4 – Water Quality Specications
Table 5 – Freeze Protection Detail
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