Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS service manual Water Chemistry, Table-O

Commercial Pool Heaters

OPERATION Continued

OPERATION AND DIAGNOSTIC INDICATORS

The control panel has up to six indicating and diagnostic lights to show all major steps of operation and control sensed malfunctions. There are display indicators on the Operating Temperature Control that give status information as well.

Water Chemistry

Factors which affect pool water and, more importantly, the efficiency of your new pool heater are:

1.Proper Filtration

2.Proper Circulation

3.Disinfection and Oxidation

4.pH Control and Total Alkalinity

5.Algae Control

6.Water Balance

The water chemistry of your pool changes daily due to natural evaporation of the water and the addition of chemicals. Chemicals are used to sanitize and control algae growth in the pool. Their addition must be carefully monitored. The accumulation of minerals or scale in the pool heater due to a chemical imbalance will cause a non-warrantable failure of the heat exchanger and its components. pH is an important factor in maintaining proper balance in your pool water. pH is the measurement of the acidity or alkalinity of water. The following chart shows the recommended pH range and what can happen when the pH increases or decreases from the ideal of 7.2 to 7.8.

Figure 49 – Exterior Control Panel with Operation/Diagnostic Lights and LCD Display

TABLE-O

Status LED Diagnostic Codes

Code
Sequence	Condition Lights
Prepurge	Operation of combustion air fans before
	ignition.
Trial for Ignition	Hot surface igniter 1 preparing to light
	burners.
Heating	Burners operating.
Service (if equipped)	Service	Indicator	when	option
	purchased.
Alarm	Indicates flame failure on either ignition
	module and will indicate additional
	alarms if the alarm of any failure option
	is purchased.

The display indicators on the Operating Temperature Control point to text on the overlay (Figure 46). They indicate the following:

Speed - This indicates that the speed setting is being displayed. The speed setting controls the responsiveness of the 3-way valve.

Open, Close - These indicators appear when the Operating Temperature Control adjusts the position of the 3-way valve.

Active - This indicator appears when the pool heater supplies heat to the pool.

Figure 50 – pH Scale

If the pH becomes too high, it lowers the ability of chlorine to destroy bacteria and algae, water can become cloudy, filter elements may become blocked, and scale formation will occur in the pool and heat exchanger. If the pH becomes too low the water becomes acidic. You can have eye burn and skin irritation, etching of the plaster, corrosion of metal fixtures and the resulting stains on the plaster, degradation of sand and gravel filters and corrosion of the copper tubes in the heat exchanger.

Damage to the pool heater due to improper water balance is non-warrantable.

We recommend using a commercial or professional test kit to monitor the following levels to ensure proper operation of your pool heater:

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