Start Up
Prior to Start up
Installation and start up of this water heater requires abilities and skills equivalent to that of a licensed tradesman in the field involved, see Qualifications on page 6.
Do not place the water heater in operation if any part has been under water. Immediately call a qualified service technician to inspect the water heater and to replace any part of the control system and any gas control which has been under water.
Light the water heater in accordance with the Lighting and Operation Instruction label on the water heater and in this manual on page 53.
The water heaters covered by this manual are equipped with an electronic control system (see page 42) which automatically sequences the Combustion Blower, pre and post purging of the combustion chamber, the Hot Surface Igniter, the 24 VAC Gas Valve, Main Burner ignition, and flame sensing. The control system will lock out after three unsuccessful ignition attempts.
Before attempting start up, thoroughly study and familiarize yourself with the exact Sequence Of Operation, see the written Sequence Of Operation on page 50 and the Sequence Of Operation Flow Chart on page 55.
Be certain that the water heater is full of water, that air is purged from the gas and water lines and that there are no leaks in the gas and water lines. Ensure all inlet water valves are open.
Filling The Water Heater
Follow these steps to fill the water heater prior to start up.
1.Close the heater drain valve.
2.Open a nearby hot water faucet to permit the air in the system to escape.
3.Fully open the cold water inlet valve allowing the piping and water heater to fill with water.
4.Close the hot water faucet opened in Step 2 as water starts to flow.
Supply Gas Line Purging
Fire or Explosion Hazard
Gas line purging is required with new piping or systems in which air has entered.
To avoid risk of fire or explosion purge discharge must not enter into confined areas or spaces where ignition can occur.
The area must be well ventilated and all sources of ignition must be deactivated or removed.
Use only the gas shown on the water heater rating label.
Keep ignition sources away from faucets after extended periods of
Read instruction manual before
installing, using or servicing
water heater.
1.Close the Main Gas Shutoff Valve, see Figure 52 on page 37.
2.Purge all air from the supply gas line up to the water heater’s Main Gas Shutoff Valve.
3.When all air has been purged from the supply gas line, tighten all supply gas line connections.
4.Check for gas leaks, see Gas Line Leak Testing on page 38, and repair any leaks found.
Initial Start Up
Required Test Equipment
•Two
•Two digital manometers can be used in place of
Note: All test equipment must be acclimated to ambient temperature before calibration and use.
Preparation
1.Using the control system menus, change the Operating Set Point to the lowest temperature setting, see Operating Set Point And Differential Adjustment on page 45.
2.Turn the water heater’s on/off switch to the “off” position.
3.Close the Main Gas Shut Off Valve, see Figure 52 on page 37.
4.Push in the gas control knob slightly and turn to the “off”position, see Figure 56 on page 51.
5.Wait five (5) minutes for any residual gas to clear.
6.Connect one manometer (higher range) to an available test port on the supply gas line at the water heater. There is a 1/8" NPT Tee fitting and pipe nipple installed for the Low Gas Pressure switch on the inlet side of the 24 VAC Gas Valve with a 1/8" NPT plug for this purpose.
7.Connect one manometer (lower range) to the manifold gas pressure tap at the outlet of the 24 VAC Gas Valve, see
Figure 56 on page 51 for location.
8.Open the Main Gas Shutoff Valve.
9.Measure and record the supply gas pressure, this is a “static” supply gas pressure reading; while the water heater is not firing. Adjust supply gas pressure as necessary, see Supply Gas Pressure Adjustment on page 51.
Lighting The Water Heater
1.Push in the gas control knob slightly and turn to the “on” position, see Figure 56 on page 51.
2.Turn the water heater’s on/off switch to the “on” position.
3.Wait for the control system to complete its boot up sequence. The Desktop screen showing the current Operating Set Point and Tank Temperature will be displayed on the control system’s LCD when the boot up sequence is complete.
4.Using the control system menus and UIM (user interface module), change the Operating Set Point to a setting higher than the current tank temperature displayed on the control system LCD plus the Differential setting to activate a call for heating. See Control System Operation on page 42.
5.Record the manifold gas pressure when the 24 VAC Gas Valve is energized and the Main Burner is ignited, the animated gas valve icon will be displayed on the Desktop screen of the control system’s LCD when the control system energizes the 24 VAC Gas Valve, a animated flame icon will appear when Main Burner ignition is successful, see the Status Icons descriptions in Table 11 on page 43.
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