Rheem ThermaForce RTGH-L199i - Relief Valve - Maintenance and Testing; Domestic Hot Water System

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USER’S INFORMATION MANUAL
TANKLESS WATER HEATER 199
Relief Valve - Maintenance and Testing
The eld-supplied relief valve manufacturer requires that under normal operating
conditions a “try lever test” must be performed once a year. once a year. Under severe service
conditions, or if corrosion and/or deposits are noticed within the valve body, you
must test more often. Also perform a “try lever test” at the end of any non-service
period.
Test at or near maximum operating pressure by holding the test lever fully open
for at least 5 seconds to ush the valve seat free of sediment and debris. Then
release the lever and permit the valve to snap shut.
If the lever does not activate, or there is no evidence of discharge, discontinue
use of equipment immediately, and contact a licensed contractor or qualied
service personnel.
If the relief valve does not completely seal, and uid continues to leak from
the discharge pipe, perform the test again to try and ush any debris that may
be lodged in the valve. If repeated attempts fail to stop the leakage, contact a
licensed contractor or qualied service personnel to replace the valve.
Domestic Hot Water System
Quality of the domestic cold water is very important to the longevity of the unit.
The recommended pH of the domestic water is between 6.5 and 8.5. The internal
domestic water heat exchanger tubing and the ow sensor is subject to fouling if
exposed to hard water (over 11.68 grains of hardness) or has a TDS of 500mg/L
or higher. See Table 3.
DESCRIPTION MAX MIN
Water Pressure 150 PSI 40 PSI
Programmable Water Temperature 149°F (65°C) 105°F (40°C)
Minimum DHW Flow Rate to Initiate
Operation
N/A 0.5 GPM
pH 8.5 6.5
Total Dissolved Solids (TDS) 500 mg/L
Total Hardness 250 mg/L
14.6 gr/gal
Aluminum 0.2 mg/L 0.05 mg/L
Chlorides 250 mg/L
Copper 1 mg/L
Iron 0.3 mg/L
Manganese 0.05 mg/L
Zinc 5 mg/L
Table 3: Domestic Water Quality Guidelines
CAUTION
Before testing the relief valve,
make certain the discharge
pipe is properly connected to
the valve outlet and arranged
to contain and safely dispose safely dispose
of water to an open drain.of water to an open drain.
NOTE
The limited warranty provided
with the water heater does not
cover defects, malfunctions
or failures resulting from
water conditions that are
not in accordance with the
specications in the table 3.