20
NOTE: WH units will operate to a maximum tank
temperature of 150°F. For setpoints above 150ºF,
an “H” model boiler configured for high-temperature
potable operation must be used and water hard-
ness must be no more than 15 grains per gallon for
scale-free operation. MODE 1 should be used and
configured for setpoint operation for process heating
applications.
NOTE: If local codes require a vacuum relief
valve, acquire one locally and install per valve
manufacturer’s instructions.
WARNING: To ensure safe operation of the XTherm
pool heater, all plumbing from the heater to the main
loop must be CPVC, copper or brass.
Fig. 22: Single Pool Heater Application
Pool Heating
For a Pool heating application, always verify that the
XTherm unit has been ordered as a pool heater. The
VERSA control board when set for a Pool heating
application will enable a built-in Thermostat function
using the S6 sensor. This function is mandatory for all
Pool Applications.
To complete installation of the heater, the system sen-
sor must be installed in the return water line, upstream
of the heater. The supplied electronic operating con-
trol is configured to operate as the poolstat.
Install sensor in supply to pool as shown in Fig. 22.
For data on acceptable pool chemistry, see Table I.
NOTE: The allowable concentrations of salt and of the Total Dissolved Solids are lower for the XTherm than
for a typical residential pool heater, due to the higher water temperatures at which an XTherm operates.
Table I: Pool Water Chemistry
*Free Chlorine MUST NOT EXCEED 5 ppm!
**In saltwater chlorinated pools, the total TDS can be as high as 4500 ppm.
Recommended Level(s) Fiberglass Pools Fiberglass Spas Other Pool and Spa Types
Water Temperature 68-88ºF (20-31ºC) 89-104ºF (31-40ºC) 68-104ºF (20-40ºC)
pH 7.3-7.4 7.3-7.4 7.6-7.8
Total Alkalinity (ppm) 120-150 120-150 80-120
Calcium Hardness (ppm) 200-300 150-200 200-400
Salt (ppm) 3000 Maximum 3000 Maximum 3000 Maximum
Free Chlorine (ppm)* 2-3 2-3 2-3
Total Dissolved Solids (ppm) 1500 Maximum** 1500 Maximum** 1500 Maximum**
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