Lochinvar 502, 2072 Relief valve, Automatic chlorinator and chemical feeders, Water flow switch

4 Water connections

Relief valve

This pool heater is supplied with a relief valve(s) sized in accordance with ASME Boiler and Pressure Vessel Code, Section IV. The relief valve(s) is installed in the vertical position and mounted in the hot water outlet. Place no other valve between the relief valve and the pool heater. To prevent water damage, pipe the discharge from the relief valve to a suitable floor drain for disposal when relief occurs. Do not install any reducing couplings or other restrictions in the discharge line. The discharge line will allow complete drainage of the valve and line. Manually operate the relief valves at least once a year.

￿CAUTION Avoid contact with hot discharge water.

Automatic chlorinator and chemical feeders

All chemicals must be diluted into the pool water being circulated through the pool heater. Any concentration of chlorine in the pool heater can cause damage to the pool heater.

Do not place chlorine tablets or bromine sticks in the skimmer. High chemical concentrations will result when the pump is not running.

Chlorinator must feed downstream of the pool heater and have an anti-siphoning device to prevent chemical back-up in the pool heater when the pump is shut off.

NOTICE High chemical concentrations from improperly adjusted feeders and Chlorinator can cause rapid corrosion to the heat exchanger. This damage is non-warrantable.

Water flow switch

A water flow switch is standard equipment. The wiring connection installs the flow switch in the 24 VAC safety circuit to prove water flow before main burner ignition. The standard flow switch is installed in the outlet side of the piping loop when shipped from the factory. These pool heaters require a sufficient flow of 26 GPM to make the flow switch and start burner operation.

Ensure that the pump installed on the pool heater will supply adequate flow to make the flow switch contacts and operate the pool heater. A water flow switch meets most code requirements for a low-water cut off device on appliances requiring forced circulation for operation.

Installation & Operation Manual

Pump purge delay

Pump purge (pre-running) delay:

The controller provides a pump purge or pre-running feature. This feature is used whenever the pump has been off for extended periods of time to conserve energy, causing air to become entrapped in the pool system piping. The pump purge/pre- running feature delays pool heater operation until the pump has been on for a sufficient amount of time to remove air from the piping. Both the inactivity time and pump purging/pre-running time are adjustable.

PH-Pump Off:

Inactivity timer is adjustable from 0 to 99 hours. Selection of time between 4 to 8 hours is recommended.

PH-Pump Purge:

Purge or pre-running timer is adjustable from 0 to 60 minutes. Selection of a time between 10 to 30 minutes is recommended.

Note: To override the purge/pre-running feature, press the PREV and NEXT buttons. To disable the feature, the purge/ pre-running timer should be set to zero.

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