MASTERZONE ZONEFIRST ZONE-ADDER MZA2 User manual
MASTERZONE
™
ZONE-ADDER
™
—
2 Zones
Model
MZA2
Installation
and Operating Instructions
ControllingYourComfort RoomByRoom
MASTERZONE
™
ZONE-ADDER
™
PANEL
SystemMode Indicator
LED
Power Indicator LED
Boot
B
utton
Zone
Terminal Blocks
for
Zone Damper Motors
and
Zone Thermostats
Re-Settable
Fu
s
e
24VAC
T
ransforme
r
Termin
a
l
s
Mode DIP
Swi
t
ches
Zone Calling Indic
a
t
ors
R
J
11
Connections
t
o
MZS4 and
additio
n
al
MZA
P
ane
ls.
Mounting
Ke
yhole
s
T
w
o
at
Top
also.
Table
of
Contents
Installation
……………………………………………
….2
Operation
……………………………………………
…..3
DIP
Switch
Se
tting………
…………………
…..……
.
3
Wiring
…………………………………………………
..…
3
Checkout
..……………
……………………………….…3
Trouble
s
hooti
n
g
………………………………………
3-4
INSTALLATION
The
MasterZone™
Adder is a two (2) zone control panel that is o
n
ly
used with the MZA2 zone panel to add one or two additional
zones.
When more
zones
are required, additional MZA panels are used
to
control up to 10
zones
.
When
installing
the MZA2
panel
it is important to pick a
central
location
where it is most convenient to bring all the
wires.
M
o
s
t
often this is at
the
furnace
or air handler. It isoften the most
convenient
locationand
closest
to
power,
the HVAC unit controls and the zone
dampers
when
typicallylocatedat or
near
the plenum. However
this panel can
be
located remotely from the main panel and only
requires
a longer 6
conductor cable with RJ11 jacks on both
ends
in order to place
remotely.
F
O
RM
MZA2 0803
©2003-04 ZONEFIRST
™
Page 2
F
O
RM
MZA2 0803
©2012
Z
O
NEF
I
RS
T
™
Page 3
The
MZA2 panel
is
made of
s
t
urd
y
ABS
plastic and can be mounted
to
any flat surface. It is
recommended
that the
panel
be mounted to a wall
or return plenum and
NOT
on the
furnace
or plenum where it will be in
contact with the hot
temperatures.. The
panelcan be located in an attic
space
or in an
enclosed
cabinet of a rooftop unit, in order for the panel
to be in direct
exposure
to the elements.
The
cover
easily removes
from the
case
by pulling firmly and separating
the cover from the
case exposing
the circuit board.
There are
4
key
-
h
o
le
mounting poi
n
t
s
in each corner of the case. The
case has openings
in
the rear of the
case as
well
as
the side for all
wiring.
Wiring can come
from the back
as
well
as
the
side
in order to
make
a
neat
installation.
OPERATION
The MZA2 is an extension of the MZS4 zone functions. The MZA2
must use the
same thermostat
wiring configuration
as
the
zones
on the
MZS4. The
MZA2 isnot
used as
a
stand alone
panel.
On a call for heatingor cooling, the panel will accept the
first
call from
any
zone,
providing no other
calls
for heating or cooling
exist
in the
system Upon accepting this call the MZA2 will open its zone
damper(s),
if not open
already, close
the
damper(s)
to those
zones
n
o
t
calling, activate the needed HVAC controls for heating or coo
l
i
n
g
,
whichever
is
being called and not accept any
calls
for the opposite
mode
.
Any
calls
for the opposite mode will be locked out until the initial mode
is either
satisfied
or a period of time
has elapsed
that is
sufficient
for the
first mode to
satisfy,
a maximum of 20 minutes. A Patent Pending
sequence
determines the time the unit has been running or needs
to
continue to run in order to adequately provide conditioning for each
mode.
If a particularmode
has already
been calling for 20
m
i
nut
e
s
o
r
longer and an opposite call comes in the MZA2 will immediately drop
the mode, enter the purge mode in order to
dissipate
the conditioned
air into the zones calling before switching over to provide the new
conditioningcallto its
zone
s.
All other
fu
nctio
n
s
are identical to the MZS4 zone operation, see the
MZS4
Installation Instructions
for further
det
ails.
DIP
Switch Settings
The MZA2 is factory set for conventional single heating and cooling
thermostats. The panel only needs to be configured when using heat
pump specific thermostats.
These thermostats
have a single output Y
connection the call the
compressor
for both heating and cooling. The
reversing
valve terminal O or B is usedto determine whether the Y call
is
for Heat or Cool. When
using
either terminal will determine whether
DIP
S
w
i
t
c
h
2 or 3
is
placed
O
N
.
Never
s
h
o
uld
both be
set
to
O
N
.
S
ee
below for other
DIP Switch
settings.
reversing
valve.
These
thermo
stat
s
will
use
the O terminal
for the
reversing
valve and should be wired
ac
cordin
gl
y
using
DIP
Switch
#3.
The B terminal
will then be wired to
the
C
terminal
on
the thermostat terminal
block.
4.
CONTROL
–
This
switchisfor future
use
.
One of the many features of the DIP switches is if at anytime the
equipment
is changed
from
single stage
to heat pump or vice
versa
the
thermostats
do not need to be changed with the equipment change.
Changing
the DIPswitch
settings
isallthat isneeded.
WIRING
TheMZA2
is
very
simple
to wire and
requires
only a minimum number
of connections. The MZA2 terminal
block
s
are
screw-less
and all wires
can easily be pushed into their respective terminal by
de-pressing
the
button for each point and
releasing
once the wire is seated. To remove
the wire, just
press its
button
again
and
remove
the wire.
Zone
Damper
s
– The MZA2 can power any 24VAC damper, either 2
wire or 3
wire. See specific
wiring
inst
ruc
t
ion
s
with the
damper
or inside
panel
cover.
Zone Thermostats
–
The thermostats
wiring will be for
single stage
(Y
-
G-
R
-
W
-
C
)
or Heat
Pump
(
Y
-
G
-
R
-
E
-
C
and O or
B). This
wiring
is
s
h
o
w
n
on
Diagrams 1 for single stage
thermostats
and 2 for heat pump
thermostats.
Transformer
– A 24VAC, 40VA
Transformer
is required to power the
panel. This
tr
a
n
s
f
or
m
e
r
is wiring to the 24VAC1 and 24VAC2
term
i
n
al
s
on the lower right corner of the circuit board.
Before
wiring to the
MZA
panel, check the
phasing
of this transformerwith the transformerthat
po
w
e
r
s
the
M
Z
S
4
panel.
E
n
s
ur
e
that both
transformers
are in p
h
a
s
e
with one another.
See directions
on
page
4.
Zone Adder
Connection
– The MZA panel communicates with the
M
Z
S
4
using
a
modular, six
(6) conductor cord with
RJ11 jacks
on each
end.
A
seven
(7’) foot cable
is
s
u
pp
l
i
e
d
with each MZA
panel.
T
h
i
s
cord
is
connected to the modular plug on the bottom of the panel and
the other end connected to the modular MZA connector on the MZS4
panel.
Up to 3 additional MZA
panels
are connected in the
same
way
in a
daisy chain
from one MZA
panel
to the
ne
xt
..
WIRING DIAGRAM 1 –
Single Stage
T
herm
o
st
at
ON
OFF
1 2 3 4
1.
TEST
–
Placing this
switch to ON
accelerates
all of the timing
sequences
for second stage and changeover, allowing the
technician to check all operational
funct
i
on
s
in a shorter
period of time.
2.
STAT
O TO W –
S
w
i
t
c
h
Is
placed to ON when
using
Heat
Pump
thermostats
that use an O terminal to activate the
reversing valve in COOLING. The O on the thermostat i
s
wired to W on the zone terminal in order to determineif the
call is for heating or
cooling.
All zone thermostats must
operate
andbe wired the
same
way.
3.
STAT B
TO W –
S
w
i
t
c
h
is used
when
using
Heat
P
um
p
thermostats
that use a B terminal to activate the
r
ever
s
i
n
g
valve
in
H
E
A
T
I
N
G
.
The
B
terminal
on the
t
h
e
rm
o
s
t
a
t
is
wired
to W on the zone terminal in order to determineif the call is
for heating or cooling. All zone
thermostats
must operate
and be wired the
same
way. NOT
E:
Some OEMs use
the
B
terminal as
a
transformer Common
and not
as
the
heatin
g
WIRING DIAGRAM 2 – Heat
Pump
Thermostats
F
O
RM
MZA2 0803
©2012
Z
O
NEF
I
RS
T
™
Page 4
0V
AC
CHECKOUT
The
MZA2
has
unique
features
that simplifythe checkout of the system
and
has LED
readouts that constantly indicate the system operation.
Once 24 Volt Power
is
applied to the panel the Green Power
LED
wi
ll
illuminate. This
will
stay illuminated constantly
when power isapplied.
The
System
LED will provide several different i
ndic
a
t
io
n
s
based
upon
color andif it is
fl
ash
i
ng
.
Heat ON – RED
Heat Limit –
RED Fla
s
hing
Cool ON
-
GRE
E
N
Cool
Limit
-
G
R
EE
N
Fl
ash
i
ng
FAN
ON/PURGE
-
AMBER
Each
zone
has its
own
small
Green indicator LED next to each zone
relay.
This
light is lit when the specific zoning
is
calling for the mode
shown on the
System
LED. When this
LED
is
GREEN
this zone is calling
and its damper must be Open. If the damper
is
not
OPEN,
check the
motor
terminals
for 24V on COM and OPEN. When the damper is
supposed
to be
CLOSED
the Green
LED
will be off and power will be
across
motor
terminals
COM andCLOSE.
transformer
terminals)
may be blown. To check, touch to see i
f
component
is hot.
If it
is hot, fuse is
blown and
mu
s
t
be
reset. This
i
s
also indicative
of apotential wiring short.
Remove
all
w
i
re
s
from the MZA2 panel and check fuse to make
sure
it
is
not hot.
Place
24VAC wires back to
transformer terminals
on panel
and power
L
E
D
s
h
o
uld
come back
on.
If it
does not, replace board.
If i
t
does light, begin adding the
wi
r
e
s
from each zone to the panel one by
one checking the power LED at each point. If the power LED drop
s
again check these wires
for a potential
s
h
ort
.
TRANSFORMER
PHASING
When using separate transformers to power the
MZ
S
4
and MZA2
panels
it is required that all
transformers
be in
phase
with one another.
To check the
transformer phasing use
a voltmeter and checkfor voltage
on one leg of the 24V
transformer
connection on the
MZ
S
4
panel
to the
opposite leg of the 24V transformer connection on the MZA2 panel.
See
the
diagram
below.
The
voltmeter
should
readzero (0) Volts. If the
voltmeter
reads
24V or
48V, reverse
the
leads
of one of the transformer
until the voltmeter
reads
zero (0)
volts. Reading
zero volts proves the
transformers are
in
phase
with one another.
MZA2
TROU
BLESH
OOTING
The MZA2 is a very simple control to
trouble
s
hoot,
especially
with the
LED indicators. The only other device needed is a simple
Volt/Oh
m
meter.
Almost all
problem
s
can be traded to an
external
component or
wiring to the MZA2. While the MZA2 has been
designed
to operate
under extreme voltage conditions and is fuse protected, like any
computer the
micro-processor
can hang up and not operate properly.
For
these instances
a BOOT button
has
been
installed
that
re-boots
the
m
i
cr
o
-
p
r
o
c
e
ss
o
r
just
like your
computer. Pressing this
button for a few
seconds
and then
release
it will allow the
micro-processor
to
re-boot
and
in most all
cases
eliminatethe
problem.
If not the following procedure
can
help
isolate
the p
r
ob
lem
.
BOOT
Zone(s)
Not
Calli
ng
E
a
c
h
zone
has
a Green
L
E
D
next to the zone
relay
when it
is calling
and
that call is being recognized by the MZA2. Provided no other zone i
s
calling for the opposite mode, check the zone that
is supposed
to be
calling and the Zone’s
LED.
If it is not on, check for 24VAC
across
the
thermostat terminal
C andthe
Y,
if a Cool
call,
W if a Heat
Call,
or G if a
Fan
call. If there is no
voltage
here at the
panel,
the panel
is
not getting
the
signal
from the
thermostat. The
problem is
mis
-
wiring,
a broken wire
or a problem in the thermostat. To check the zone on the
panel,
place
jumper from
R
to
Y, R
to W or
R
to G to
see
that the panel
is
operating
prop
e
r
ly
.
Zone(s)
Will Not
Shut
Off
If a zone will not stop calling, the Zone LED
s
hould
still be on.
Dependingon the call
disconnect
the Y,W or G wire from the terminal
strip.
The zone will drop out. Check the thermostat wiring for a
m
i
s-
wiring or short that
keeps
the zone calling. If the call
remains
and the
thermostat is disconnected, replace
panel.
24VAC 2
24VAC 1
MZS4
24VAC
24VAC
C
R
C
R
24V 40VA
Transformer
0V
AC
Voltmeter
Damper
Motor
Ch
ec
kout
To checkout the
dampers,
the panel provides 24VAC to the COM and
O
P
E
N
when the
damper is
to be open and 24VAC to COM and
C
L
O
S
E
when the damper
is
to be
C
L
O
S
E
D
.
When any zone
is
calling and i
t
s
Green
LED
is
O
N
,
there
is
24VAC
across
COM and OPEN. The only
time a damper will
close
is when anther zone
is
calling and
its
zone is
not calling. In this instance there will be 24VAC
across
COM and
CLOSE.
Power Light
Not On
If the Power light
is
not on and there
is
24VAC at the transformer
terminals,
the MZA2 fuse, (Yellow rectangle component above
55
Bushes Lane
•
Elmwood Park,
New
J
e
rsey
07407-3204
US
A
Telephone
1.201.794.8004
FAX
1
.
201.7
94.
1359
www
.z
onef
i
r
st.
c
om
info@
zonef
irst.com
