LAARS Pennant PNCP - Install and Operating Manual - Manual (Page 12)

LAARS Heating Systems Page 12
This keeps cold return water from causing condensing
on the outside of the Pennant heat exchanger.
IMPORTANT NOTE: Since heater outlet temperatures
can reach 150°F (66°C) in some cases, copper
or CPVC are recommended materials for heater
connection piping. PVC material may be used for the
inlet valve and the piping upstream of it.
When pipe, fittings, grids or any other element
of the filter system are made of plastic materials, they
may be damaged by the momentary “back siphoning”
of hot water from the heater when the filter pump stops
running.
See Figure 6 for proper connection of the
Pennant heater to the pool loop.
4.2 Automatic Chlorinators
SECTION 4.
Water Connections
4.1 Piping
Hot water piping should be supported by suitable
hangers or floor stands. Do not support piping with
this appliance. Due to expansion and contraction of
copper pipe, consideration should be given to the type
of hangers used. Rigid hangers may transmit noise
through the system resulting from the piping sliding in
the hangers. It is recommended that padding be used
when rigid hangers are installed. Maintain 1" clearance
to combustibles for hot water pipes.
Pipe the discharge of the relief valve (full size) to
a drain or in a manner to prevent injury in the event of
pressure relief. Install shutoff valves where required by
code.
Pennant Pool Heaters are equipped with mounted
pumps, which serve the heater plus 30 feet of full-
sized piping with a normal number of fittings. If the
pool’s loop is more than 15 feet away from the heater,
please contact the factory.
A mixing system is mounted on the heater. The
system consists of a three-way valve, temperature
control and piping. The temperature sensor for the
control is in the heater inlet. When the control detects
water temperature that is below 120°F (49°C), it will
direct the three-way valve to actuate, which sends
water from the outlet of the heater back to the inlet.
The outlet water that is diverted to the inlet mixes with
the return water from the pool, and keeps the inlet
temperature at or above 120°F (49°C) (see Figure 5).
Figure 5. Mixing System.
Figure 6. Pool Heater Piping.
The Pennant Pool Heater is shipped with a field-installed mixing system, and must be piped in primary-
secondary style, as shown. A remote pool temperature sensor and remote pool temperature high limit
are wired to the Pennant, to be mounted in the pool water loop, as shown.