Transformer - Econar GeoSource 2000 GW Series Installation And Operating Instructions Manual

E.
Application Diagrams
Figures 1
through
5
show
the components
of
a
hydronic
heat
pump
system discussed above used
in
some
common
applications. These
figures
by no
means
represent
all
the
possible hydronic
heat
pump
applications,
but they
do
show some
important
principals that can
be applied to any
system.
VII. ELECTRICAL
SERVICE
e
Note
- Always refer to the inside
of
the electrical
box
cover
for
the
correct
wiring diagram, and always
refer
to
the nameplate
on the exterior
of
the cabinet
for
the
correct
electrical specifications.
9WARNING
_ ELECTRICAL SHOCK CAN CAUSE
PERSONAL
INJURY OR DEATH.
Disconnect all
power
supplies
before installing
or
servicing electrical
devices.
Only
trained and
qualified
service personnel
should install, repair or service
this equipment'
gwARNtr.iG
-
THEUNIT MUST BE
PROPERLY
GROUNDED:
The main
electrical
service must be
protected
by
a
fuse
or
circuit breaker and
be
capable
of providing the
amperes
required by the
unit
at
nameplate voltage.
A11
wiring
must
comply
with
the
national electrical code and,/or
any
local
codes
that may apply. Access
to
the
line
voltage contactor
is
through the knockouts provided
on
either side
of
the
heat
pump next to
the
front corner. Route
EMT
or
flexible
conduit
with
appropriate
whe to
the
contactor.
Ensure adequate
supply
wiring
to minimize the
level of
dimming lights during
compressor startup on
single-phase
installations. Some
dimming is
normal, and a variety
of
stafi-assist accessories
are
available
if
dimming
is
objectionable,
eNote
- do not add
additional start assists
to units already having
a
factory-installed start assist.
VC,lUffOU -
Three-phase
units must be wired
properly
to
ensure
proper
compressor
rotation. Improper rotation
may result
in
compressor damage.
An
electronic phase
sequence
indicator must
be
used
to check supply-wiring
phases.
Also, the
"Wild" leg of
the
three-phase
power
must be connected
to
the
middle leg
on the
contactor'
Important
- Only
the
ECONAR
PumpPAKrM is certified
to
be
wired directly to the
compressor contactor and can
be grounded
in
the
grounding
lug for 208l23oYac. An
alternative
loop
pump or a pump
for
a
different
supply
voltage must be
powered
from a
separate
fused power
supply and
confrolled through an
isolation relay that
has
its coil wired to
the
contactor
circuit.
An
intemal pump
relay provides the electrical power
through
the 3-pole terminal
block (BP)
for
the hydronic-
side circulator pump.
The
use
of
impedance
protected
i0
pumps
eliminates the need
for additional fusing.
Do not
connect more than
a
1/3
horsepower pump to the
internal
pump relay terminal
block.
eNote
-
The GW380
does
not have an
internal
pump relay.
A pump
for
the GW380,
or
a
pump larger than
1/3 horsepower
on any
other
unit,
must be powered from a separate
fused
power
supply and
controlled through an isolation
relay that has
its
24Vac
coil wired to the
Y
and
X
terminals.
V[I.
}4YOLT CONTROL CIRCUIT
Note
- Always refer
to
the inside
of the electrical box
cover
for
the
correct
wiring
diagram.
There are three
basic sections
of
the
low voltage circuit;
transformer, remote
hydronic controls, and
controller.
A. Transformer
An
internal
transformer provides 24Yac
for all
control
features
of
the heat
pump. Even though the transformer is
larger than
the
industry
standard,
it
is
in
a
warm
electrical
box and can
be
overloaded
quickly. Table
5
shows
the
transformer usage
for
the
hydronic
heat pumps.
Table5-TransformerU
elmportant
-
If
the system's extemal conffols
require
more than shown
in
Table 5, an
extemal transformer and
isolation relays should be used.
Table
5
shows
that the
heat
pump's internal transformer can
easily power the 24-
Volt
system.
In
conffast, Figure
4
shows a
fan
coil system
with its own power supply,
which must interface
to
the
heat
pump
to put
the heat
pump
into
the
cooling
mode.
This can be
accomplished
by
using
the fan
coil's
independent
power supply
to
energize
the
coil
of
an
isolation
relay with
contacts located
in
heat
pump's
conffol circuit.
9WARNING - The GW380
uses a
large-capacity 24Yac
Control Transformer, and
freld
wirhg
to remote
hydronic
controls
must
be suitable
for NEC
Class
1.
elmportant
- Miswiring
of
24Yac control voltage on
system
controls can result
in
transformer bumout.
elmportant
-
Units with
a
dual voltage
rating
(example,
2081230)
are
factory-wired
for
the higher
voltage
(example, 230).
If
connected
to
a
power supply having the
1
7 (2)
21
4
N/A
Pump Relay
4
8
18
8
Reversing
Valve
2
2
Controller 20-1038 2
Compressor Overload
6 (2)
N/A
N/A
4 (2)
N/A
4
Contactor
Pilot Relays
2
2
2
10
10
10
1O6VA 33VA
44YA
50 75 150
Transformer
VA
size
f
I
380
29-67
98,120
Component
Remote
Hydronic Control
Plus Accessory
("A)
Total