Service manual

24
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 pipe work 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 pipe work 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 and no more than 21 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 and no more than 37 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.