20
3.9.9. Automatic Chemical Feeders
All chemicals must be introduced and completely diluted
into the water before being circulated through the heater.
High chemical concentrations will result when the pump
is not running (e.g. overnight).
A
A
CAUTION:
Combustion air must not be contaminated
by corrosive chemical fumes which can damage the
heater and void warranty.
A
A
CAUTION:
High chemical concentrations from feeders
that are out of adjustment will cause rapid corrosion to
the heat exchanger. Such damage is not covered under
the warranty.
CAUTI
ON: Failure of a heat exchanger due to lime scale
build-up on the heating surface, low pH or other chemical
imbalance is non-warrantable.
3.9.10.
Pool Heating
When a boiler or water heater is used in a pool heating
application, ensure that all the following installation
requirements are met. See
Figure 22
.
The XTherm must be equipped with a direct-coupled
injector pump for pool applications. The standard integral
wet-rotor injector pump system supplied with all H and
model 1005A WH XTherm heaters MUST NOT be used
for pool service. The direct-coupled pump is optional on
all H and 1005A WH models, and standard on 1505A and
2005A WH and all P models.
The injector pump must be set to maintain 120°F (49°C)
at the inlet to the primary heat exchanger on all XTherm
models. To complete installation of the heater, the system
sensor must be installed in the return water line, upstream
of the heater and wired to the S3 sensor position (TB1,
pins 6 and 7).
The onboard VERSA IC operating control is configured to
operate as the poolstat. A sensor is shipped loose to be
installed in the system piping downstream of the heater
outlet. See
Figure 22
for the sensor locations. Wire the
sensor to the S6 sensor position (TB1, pins 2 and 3).
For data on acceptable pool chemistry, see
Table L
. For
pipe sizing, see
Table G
and
Table K
.
A
A
WARNING:
To ensure safe operation of the XTherm
pool heater, plumbing from the heater outlet to the main
loop must be CPVC, copper or brass.
A
A
CAUTION:
Combustion air must not be contaminated
by corrosive chemical fumes which can damage the
heater and can cause unwarrantable damage to the
heater.
Maximum distance not to exceed
4 pipe diameters or 12" (305 mm)
1
TO POOL
S6 SENSOR
S3 SYSTEM SENSOR
CPVC UNION (SLIP)
FROM FILTER
1
F10018
CHECK VALVE
Figure 22.
Single Pool Heater Application
3.9.11. Winterizing Your Heater
Heaters installed outdoors as pool heaters in freezing
climate areas should be shut down for the winter. To
shut down the heater, turn off manual main gas valve and
main gas shut-off. Close isolation valves. Drain the heater
using the hose bibs located on the bottom of both heat
exchangers. Disconnect the condensate hose from the
stainless steel condensing heat exchanger and drain the
condensate trap.
NOTE:
There are 3 separate drains on the XTherm that
must ALL be drained to protect the heat exchangers.
These are accessible by removing the lower front door
from the heater for the 2 primary drains and the right-rear
panel for the condensing heat exchanger drain. Drain any
piping of all water that may experience below-freezing
temperatures.
A
A
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
damage the heater. Follow these instructions to make
sure your heater is properly installed.
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