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Piping
Pool Water Lines
The connections for the pool loop are 2" PVC unions,
rigidly fixed to the cabinet to prevent relative movement
and possible resulting damage to interior piping. They are
labelled as INDOOR IN and INDOOR OUT.
Piping for a typical system is shown in following diagram
002297PDG
. This diagram shows all of the recommended
components as well as where they should be placed, although
placement will vary according to layout of duct system and
space in mechanical room. The unions allow access to the co-
axial heat exchanger should it require cleaning, and quick dis-
connect of PC unit.
NOTE: Care should be taken when routing the water lines to
ensure that adequate access to the heat pump is maintained so
as to not compromise ease of serviceability, particularly access
to both side doors and the air filter change cover.
Drawing
002297PDG
for setting the water flow based on refrigerant head pressure,
using two hand-operated ball valves. It is important to follow
this procedure to ensure high efficiency operation and long ser-
vice life for equipment, and to avoid service calls due to nui-
sance safety control trips.
Condensate Drain
The unit comes equipped with two 3/4" female NPT drain
connections, labeled "Condensate Drain". This drain allows the
condensate which forms during the air-conditioning cycle to be
removed from the unit. The drain should be connected as per
local codes. During high humidity weather, there could be as
much as 25 gallons of water formed per day.
The condensate drain requires an external trap. It is rec-
ommended to use a pre-made trap with cleanout like that shown
in the diagram. The drain should be back to the pool where
allowed by codes, in order to reduce the amount of make-up
water required for the pool. An external condensate pump may
be installed if there is not sufficient slope to drain condensate
under gravity to its destination.
NOTE: The condensate drain operates by gravity. Ensure
the unit is mounted high enough to allow the condensate to
flow without overflowing the internal drip tray located at the
bottom of the unit.
To avoid overflow of the condensate pan, the drain line
and trap should be inspected periodically to ensure they are not
plugged with accumulated debris.
ISSUE 03: 1-Oct-2021
following also outlines the method
Simultaneous Pool/Hot Tub Heating
The following diagram
methods of heating both a pool and a hot tub with the PC unit.
Note that if heating two pools of differing temperatures
using a parallel arrangement as in section 1 of the diagram,
external aquastat(s) will be needed to control the pool water
heating demand, since the internal Setpoint Control routine only
has one setpoint. Also, the flow will need to be set using the
procedure outlined on diagram 002297PDG, but flow through
the pool and hot tub will need to be set separately because of
the different water temperatures.
If using an indirect pool heating arrangement as shown in
section 2, the internal Setpoint Control routine can be used.
Alternatively, the PC unit can be used to heat the pool,
while the hot tub can be heated by a different pool heating de-
vice dedicated for that purpose.
Air Conditioning with Cold Water
Normally, installations that require air cooling will use the
accessory outdoor unit to reject heat to the outdoor air. Howev-
er, for locations that have well water or other cold water availa-
ble and a place to reject the water to, like a drain or return well,
there is an alternative to using the outdoor unit.
A pair of 24VAC 3-way valves can be placed in the IN and
OUT pool water lines connected to the unit, as shown in the
diagram on following page. Connect the IN valve common port
to the PC IN port, the NO port to the supply from the pool, and
the NC port to a clean cold water source. It may also be neces-
sary to install a regulating valve (e.g. hand valve, dole valve) to
restrict the flow to obtain the recommended discharge pressure
of 350-400PSIG. Connect the OUT valve common port to the
PC OUT port, the NO port to the return line to the pool, and the
NC port to a suitable drain.
The valves can be controlled by the L1 output from the
PC's control board, as shown. L1 will output 24VAC whenever
the PC unit enters air cooling mode. Note the current limit of
500mA from L1; if 3-way valve current draw exceeds 500mA,
or if 3 way valves with non-24VAC coils are used, a separate
power supply switched by a 24VAC relay is required.
In the absence of an outdoor unit, a jumper from DET-DET
is required to enable air cooling mode, as shown on diagram.
Page 15
001824PDG
shows two suggested
002291MAN-03
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