4. Next, connect a hose to the Drain Valve on the DHW Side of the piping assembly. Open
the Relief Valve to allow air into the pipe during draining.
5. Open the Drain Valve to drain the domestic water from the unit.
6. After the boiler water and domestic water have been drained from the unit, close the Relief
Valve opened in step 4 and tighten the Victaulic coupling loosened in step 3.
CAUTION!
Step 7 applies ONLY to SmartPlate Double-Wall models. Skip this step for all Single-Wall
models.
7. For SmartPlate Double-Wall Water Heater models, it is also advisable to separate and
clean the plates using the procedures in Chapter 8, section 8.6.2. Leave the double-wall
heat exchanger in an un-tightened or slightly tightened condition. Cover the heat
exchanger with dark plastic to protect it from welding light and dirt (rubber gaskets are
sensitive to welding light). Do not store organic solvents or acids in the room. Avoid heat
or ultraviolet light.
Figure 5-2. Typical SmartPlate Piping
8. To place the Water Heater back in service, fill the unit and perform the pre-operational
checks and start-up procedures described in sections 5.2 and 5.3.
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