OPERATING YOUR WATER HEATER
Read and understand these directions thoroughly before attempting to operate the water heater (see Operating Instructions on Page 23). Check the data plate on the front of the water heater for the correct gas. Do not use this water heater with any gas other than the one listed on the data plate. If you have any questions or doubts, consult your gas supplier or gas utility company.
L.P. (Propane) Models
Propane gas is heavier than air and in the occurrence of a leak in the system, the gas will settle on the floor level. Basements, crawl spaces, skirted areas under mobile homes (even when ventilated), closets and areas below ground level will serve as pockets for the accumulation of gas. Before lighting a propane gas water heater, smell all around the appliance at floor level. If you smell gas, follow the instructions as given in the warning on the front page.
When your propane tank runs out of fuel, turn off the gas at all gas appliances including pilot lights. After the tank is refilled, all appliances must be
Water Heater Operation
This water heater does not have a pilot light. It is equipped with an electronic ignition that automatically lights the burner. There are three lights to indicate the various stages of operation; Green = Electrical power is on, Yellow = Thermostat is calling for heat, which signals the beginning of the ignition sequence (see figure 21), and Red = Ignition control is signaling the gas valve to open.
Figure 21: Sequence of Operation
When the thermostat calls for heat, the blower will run for
6 seconds to purge the system of any accumulated gas or air. The hot surface igniter will heat up for 35 seconds. The blower will turn on and the gas valve open, forcing the air and gas mixture across the hot surface igniter, causing the burner to light. The hot surface igniter will turn off and act as an electronic flame sensor to determine if burner ignition has been accomplished. If it detects any loss of flame, it will shut off the gas supply to the burner.
The ignition control will try to light the burner three times. If the ignition control does not detect a flame after three tries, it will temporarily lock out, but then auto restart and go through three additional tries for ignition after 60 minutes.
It will repeat until ignition occurs or the system locks out requiring service. Refer to Troubleshooting Guide on Page 26.
Thermostat Sensor
The sensor is a 10K ohm [at 77°F (25°C)] thermistor. Read resistance through the black wires that run to the sensor. Remove wires from circuit board before checking. An open or short circuit indicates sensor failure. Check reading against the values listed in Table 3. The resistance should correspond with the temperature in the tank:
Table 3:
| Temperature | I | Resistance | |
60°F |
| 16°C |
| 15,300 ohms |
80°F |
| 27°C |
| 9,300 ohms |
100°F |
| 38°C |
| 5,800 ohms |
120°F |
| 49°C |
| 3,800 ohms |
140°F |
| 60°C |
| 2,500 ohms |
160°F |
| 71°C |
| 1,700 ohms |
185°F |
| 85°C |
| 1,100 ohms |
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