Bradford White UCG100H199 Installation & Operation Manual page 21

TO FILL THE WATER HEATER
1. Close the water heater drain valve by turning the knob clockwise. If alternative water connections are provided but
not used, make certain they are plugged (i.e. rear connections).
2. Open the cold water supply shut-off valve.
3. Open several hot water faucets to allow air to escape from the system.
4. When a steady stream of water flows from the faucets, the water heater is filled. Close the faucets and check for
water leaks at the water heater drain valve, combination temperature and pressure relief valve and the hot and cold
water connections.
5. To restore operation of water heater refer to operating instruction label on the water heater.
TO DRAIN THE WATER HEATER
Should it become necessary to completely drain the water heater, make sure you follow the steps below:
1. Reduce the thermostat setpoint to the lowest setting. Depress the control panel rocker switch on the front of the
control box to the "OFF" position and disconnect the power to the water heater.
2. Shut off the gas supply to the water heater.
3. Close the cold water supply shut-off valve.
4. Open the drain valve on the water heater by turning the slot on the valve counter-clockwise. The drain valve has
threads on the end that will allow the connection of a standard hose coupling.
5. Open a hot water faucet to allow air to enter the system.
To refill the water heater, refer to "To Fill the Water Heater
ALTERNATE SPACE HEATING WATER CONNECTIONS
Toxic chemical, such as those used for boiler treatment, must not be introduced into potable water used for space
heating.
This water heater must not be connected to an existing heating system or component(s) previously used with a non-
potable water heating appliance.
All piping components connected to this water heater for space heating applications must be suitable for use with
potable water.
When the system requires water for space heating at temperatures higher than required for other means, an ASSE
approved mixing valve must be installed to temper the water for those uses in order to reduce the scald hazard potential.
Failure to properly pipe this water heater may result in improper operation and damage to the water heater or structure.
Oxygen contamination of this water heater will cause corrosion of iron and steel components, and can lead to water
heater failure.
DANGER
WARNING
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