POOL HEATING
CAUTION: Power to the heater should be interlocked with the main system pump to make sure the heater does not fire without the main system pump in operation. Improper flow control can damage the heater. Uncontrolled flow (too high) or restricted flow (too low) can seriously affect heater operation. Follow these instructions to make sure your heater is properly installed.
The ADB unit is equipped with an external pump and bypass arrangement that blends outlet water with the inlet to increase the inlet water temperature, thereby reducing the likelihood of condensation forming on the heat exchanger. The pump also serves to circulate water through the heater form the main system piping.
CAUTION: ADB bypass piping should be copper and/or CPVC. PVC piping should NOT be used.
To complete the installation of the pool heater, the pool thermostat needs to be installed in the main return water line. This will ensure that the heater will be ener- gized at the right time. If the main water line is too far away from the heater and the capillary bulb will not reach it, locate the pool thermostat adjacent to the main line and run wires back to the heater. See Figure 13 and 14.
Adjustment of the bypass valve is critical to proper operation of the heater. The bypass valve should be adjusted to achieve a minimum inlet water tempera- ture of 105°F and an outlet water temperature of 125°F. When starting with a cold pool, make initial adjustments. Make final adjustments when pool water approaches desired temperature. Refer to Table G for flow rates.
Automatic Chlorinators and Chemical Feeders
All chemicals must be introduced and completely dilut- ed into the pool or spa water before being circulated through the heater. Do not place chlorine tablets or bromine sticks in the skimmer. High chemical concen- trations will result when the pump is not running (i.e. overnight).
Chlorinators must feed downstream of the heater and have an
NOTE: High chemical concentrates from feeders and chlorinators that are out of adjustment will cause very rapid corrosion to the heat exchanger in the heater. Such damage is not covered under the warranty.
Winterizing Your Heater
When heaters installed outdoors in freezing climate areas are to be shut down for the winter, please observe the following procedure:
1.Turn off manual main gas and main gas shut off. Remove the drain plug or open the drain valves located on the bottom header.
Pool and Spa Water Chemistry
NOTE: Chemical imbalance can cause severe damage to your heater and associated equipment. Maintain your water pH between 7.4 and 7.8 and total alkalinity between 100 and 150 p.p.m. If the mineral content and dissolved solids in the water become too high, scale forms inside the heat exchanger tubes, reducing heater efficiency and also damaging the heater (max TDS at 3000 ppm). If the pH drops below 7.2, the heater will be severely damaged.
*Loop is secondary piping to heater from main system
Table G: Flow Rates
NOTE: Heat exchanger damage resulting from chemical imbalance is not covered under the warranty.
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