LAARS Mighty Therm AP (Sizes 500-1825) - Installation, Operation and Maintenance Instructions - Manual (Page 16)

LAARS Heating Systems
Page 16
The general recommendations include keeping
the water chemistry stable within the following
guidelines:
pH: 7.2 to 7.8
Free Available
Chlorine:
2.0 - 4.0 ppm
Total Alkalinity: 80 - 120 ppm
Calcium Hardness: 200 - 400 ppm
Total Dissolved Solids: < 1500 ppm
These values are important to maintaining the
pool equipment in proper operating condition and
preventing corrosion, liming or other problems.
Proper pool water chemistry includes other values
that must be maintained for swimmer safety. Refer
to your local agency having jurisdiction, NSPI
(National Spa and Pool Institute), the CDC (Centers
for Disease Control), or the WHO (World Health
Organization) for more information.
Section 5
Troubleshooting
For proper service and problem diagnosis of the heater
and heater system, the following tools are required:
a. Gas pressure test kit with range from zero to 14
W.C. Either a slack tube manometer or an accurate
gas pressure gauge is acceptable with proper
adapters to connect to the available fi ttings in the
line and on the gas valve.
b. Multi-meter with the following ranges:
0 to 500 volts A.C.
0 to 1000 ohms continuity
0 to 50 millivolts
0 to 20 microamps
c. Tube cleaning kit consisting of reamer, stainless
steel brush, speed handle and handle extensions.
d. A pool thermometer with a proper range.
e. A pressure gauge with proper range.