Rinnai FUA-E, Service Manual, Page: 19 / 67

19
Testing
1. Purge gas, hot water and cold water supply lines before making the final connection
of the water heater. Swarf in either the gas or water supplies may cause damage.
2. Turn on gas and cold water supplies.
3. Test for water leaks and gas escapes near the unit.
4. Isolate gas and electric supply. Remove test point screw located on the inlet gas
pipework below the heater and attach pressure gauge.
5. Turn the power on at the switch and turn on gas.
Warning: There are 230V AC live
supplies inside the heater.
6. If remote controllers are fitted, turn the controller on, select the maximum delivery
temperature and open ALL available hot water outlets. If remote controllers are not
fitted, simply open all available hot water outlets. (CAUTION: Ensure building
occupants do not have access to hot water outlets during this procedure).
7. The gas pressure check must be carried out with all other appliances on the same
main operating at maximum capacity to ensure that there is sufficient gas pressure.
8. With all appliances on the same main operating at high fire check the pressure at the
test point on the inlet to the gas valve. The pressure must be within the local defined
limits for the type of gas that is being used. If the pressure is lower, the gas supply is
inadequate and the water heater will not operate to specification. Check gas meter,
regulator and pipework for correct operation/sizing and rectify as required. Note that
the gas regulator on the appliance is electronically controlled and factory pre-set.
Under normal circumstances it does not need adjustment during installation.
UK the gas pressure must be at least 20 mbar for G20 Natural Gas as used in
UK. For G31 Propane as used in the UK the pressure must be at least 34.5
mbar .
9. Close hot water outlets.
10.Inspect and clean the strainer and the filter located on the cold water inlet pipe. This
procedure may need to be repeated to ensure the strainer remains clear.
11.If temperature controllers are fitted, it is necessary to test their operation through the
complete range of functions.
12.Confirm the hot water delivery temperature using a thermometer. If controllers are
fitted, compare the measured value to the set point.
13.After testing is completed, explain to the user the functions and operation of the
water heater and temperature controllers.