Advertisement
hrge Catt
Figure
4-HeatPump
Purge
Setup
Purge
the heat
pump
with
the
antifreeze solution using
the
same
procedure that
was used
to purge
the earth
loop.
When
the
earth
loop
and heat
pump
are
both purged
of
air
and debris, and have
the correct solution
of
antifreeze
in
them, the
system
should be
pressurized.
With
the
purge
pump running, rotate the
fill
and
purge
valves
on
the
PumpPAKrM to
the
positions shown
in
Figure
5.
Top EtIt
and hrge va1v.
Earth loop
------+
H.ats Puq)
to 40 psi. Make
sure
that the
system
is
at this
pressure
after the loop pipe
has
had
enough
time
to
stretch.
In
order to
achieve the 30
to
40
psi
static pressure, the
loop
may
need
to
be
initially
pressurized
to 60 to
65
psi. This
static
pressure
will
fluctuate
from
heating
to
cooling
season,
but
the
pressure
should always remain above zero
so
the
PumpPAKsrM
circulation pumps
do not
cavitate,
and
air
cannot be
pulled
into
the system.
When the
loop
system
is
pressurized,
rotate the
fill
and
purge
valves
on
the PumpPAKrM
to
the
positions
shown
in Figure 6,
and
turn
off
the
purge pump.
Top liu.
aad Prgo vdre
Earlh
kop
-+
->
Hcat
PurF
turyc
Prry)
BotE6 EiIl
d
tugc
Val@
Ealth
1,oop
<-
+-
Heats
tuq,
tugc cd
Figure
6
-
Normal Operating
Setup
V.
SYSTEM STARTUP
After
the
loop
system has been
completely
filled,
purged,
and
pressurized,
return
power
to
the
unit
and
start
the
PumpPAKrM circulators
to
check
for
proper
operation.
If
the
PumpPAKrM circulators
are
not operating, turn
off
the
power to
the
unit
and
diaglose
the
problem.
If
the
PumpPAKrM
is
operating
correctly,
measure
the
pressure
drop
across
the
heat
pump using the
P/T
ports
where the PumpPAKrM
is
connected
to
the
heat pump.
Remember
to
use
the
same pressure gauge
for
both
readings,
in
order
to
obtain
a
more
accurate
reading.
Compare
the
measured pressure
drop with the
data
supplied
in
the
heat
pump's Installation
and
Operating
Instructions
or
ECONAR's Engineering
Specifications
manual.
If
the
flow is
too
low,
recheck
the sizing
of
the
PumpPAKrM
for
sufficient capacity.
If
the
PumpPAKrM
selection
is
correct,
there
may
be
trapped
air or
some
other restriction
in
the
earth
loop, which would
cause
decreased
flow.
This
will
have
to
be
fixed for
proper
heat
pump operation.
Top
fiu
and
Purge
Valvc
Ea!*
loop
E.r&
loop
hrqc
PW
Botl6
EiU ad hrg€
Va1v.
-----)
Heat
rlry
<-
E6at
Dtq
I
Purge PW
BorE6 Ei]l
d
Purg€ Vafve
Eadh
loop
+--
<-
Beat
hq,
Prgc Cart
Figure
5
-
Loop Pressurizing
Sehrp
Solution
flow into
the purge
cart
should
stop.
The
loop
system pressure
should
rise quickly
as the purge
pump
forces more solution
into
the
loop.
If
the
water
leve1
in
the
purge
cart falls,
air
in
the loop
system
is
being
compressed and
further purging is
necessary.
The
system
should be pressurized
to
maintain a
static pressure
of
30
4
f
)
Advertisement
