16
HARD WATER INSTALLATION
Based on your water conditions, the heat exchanger may need to be flushed. Contact Essency for more
information. See the Care and Cleaning section on how to proceed (see page 41).
NOTICE: DO NOT apply heat to the hot or cold water connections. If sweat connections are used, sweat
tubing to adapter before fitting adapter to the water connections on the water heater. Any heat applied to
the water supply fittings will permanently damage them or other plastic parts.
NOTICE: Make sure the overflow line is well connected and not obstructed.
NOTICE: DO NOT put any liquid other than water, without any additives, into the tank of the water heater.
2.2. RECIRCULATION
The EXR is recirculation compatible and can be accomplished in one of two ways:
1. With a dedicated return line
2. Without a dedicated return line
In both cases, installers should keep the following in mind when setting up the pump:
• Flow rate delivered by pump should be between 0.3 and 1 GPM. Ideally, the flow rate would be 0.8 GPM.
• Pump should be operating as little as possible and no more than 6 hours per day (for example 3 hours in the
morning, 3 hours in the evening).
For best performance, we recommend limiting each pump ON cycle to less than 2 hours. With built-in
mechanical pin timers, for example, 1:45 ON and :15 OFF is represented by 7 pins up and 1 pin down.
An ON cycle of 2 hours or more may cause a nuisance alarm on the touchscreen related to the leak
detection (see Troubleshooting & Service page 43).
• In any case, it is recommended to limit the velocity in piping < 4 ft/s to avoid any erosion issue.
NOTE: A recirculation system can lead to high heat losses. It is strongly recommended the hot water and
dedicated return lines to be fully insulated.
Following these guidelines will help maintain the full warranty, reduce wear and tear on the entire plumbing
system, save energy, and keep your water heater in optimum operating condition.
If you don’t have another way of confirming flow rate delivered by the recirculation pump, the EXR’s
touchscreen does have the capability of displaying real-time flow rate by following the instructions in the
Useful tips section (see page 37).
Make adjustments to valves, pump speed, etc… until the value on the touchscreen is between 0.3 and 1 GPM
(displayed as 3 - 10).
In addition to the guidelines above, installers must follow all applicable codes and pump manufacturer
instructions.
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