Pool Heating - Raypak XTherm Series Installation & Operating Instructions Manual

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.

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.
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.
Recommended Level(s)
Water Temperature
pH
Total Alkalinity (ppm)
Calcium Hardness (ppm)
Salt (ppm)
Free Chlorine (ppm)*
Total Dissolved Solids (ppm)
*Free Chlorine MUST NOT EXCEED 5 ppm!
**In saltwater chlorinated pools, the total TDS can be as high as 4500 ppm.
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.
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.
Fiberglass Pools
68-88ºF (20-31ºC)
7.3-7.4
120-150
200-300
3000 Maximum
2-3
1500 Maximum**
Table I: Pool Water Chemistry
20
Fiberglass Spas
89-104ºF (31-40ºC)
7.3-7.4
120-150
150-200
3000 Maximum
2-3
1500 Maximum**
Other Pool and Spa Types
68-104ºF (20-40ºC)
7.6-7.8
80-120
200-400
3000 Maximum
2-3
1500 Maximum**