Form 2045-0803 © Copyright Trolex Corporation & ZoneFirst
P a g e
| 5
6 Aspen Drive - Randolph, NJ 07869 | 1-877-FirstZone (347-7896)
ZoneFirst.com | Shop Online at ZoneDampers.com | fb.com/ZoneFirst
WIRING
The MZS4 is very simple to wire and requires only a minimum number
of connections. The MZS4 terminal blocks 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.
WIRING DIAGRAM 1 –
Single Stage Thermostat
C W R Y G
SINGLE STAGE THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
R
G
E
W/OB
Y
C
MZS4 ZONE
CONNECTIONS
CLOSE
OPEN
COM
C W R Y G
SINGLE STAGE THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
G
E
C
CONNECTIONS
CLOSE
OPEN
COM
C W R Y G
SINGLE STAGE THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
R
G
E
W/OB
Y
C
CONNECTIONS
CLOSE
OPEN
COM
C W R Y G
SINGLE STAGE THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
G
E
C
CONNECTIONS
CLOSE
OPEN
COM
C W R Y G
SINGLE STAGE THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
R
G
E
W/OB
Y
C
MZS4 ZONE
CONNECTIONS
CLOSE
OPEN
COM
C W R Y G
SINGLE STAGE THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
G
E
C
CONNECTIONS
CLOSE
OPEN
COM
C W R Y G
SINGLE STAGE THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
R
G
E
W/OB
Y
C
CONNECTIONS
CLOSE
OPEN
COM
C W R Y G
SINGLE STAGE THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
G
E
C
CONNECTIONS
CLOSE
OPEN
COM
WIRING DIAGRAM 2 –
Single Stage , Two Stage and Three
Stage Heating Equipment and up to Two Stage Cooling
W2
W1
Y1
Y2
O
G
E
B
R
First Stage Cooling Relay
24V. Transformer
Second Stage Cooling Relay
First Stage Heat Relay
Fan Relay
EQ
U
IP
M
EN
T
HEATING COOLING EQUIPMENT
Second Stage Heat Relay
W3
Third Stage Heat Relay
WIRING DIAGRAM 3
–
Heat Pump Thermostats
C
O/B
R Y G E
HEAT PUMP THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
G
E
W/O/B
Y
C
MZS4 ZONE
CONNECTIONS
CLOSE
OPEN
COM
C
O/B
R Y G E
HEAT PUMP THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
R
G
E
C
CONNECTIONS
CLOSE
OPEN
COM
C
O/B
R Y G E
HEAT PUMP THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
G
E
W/O/B
Y
C
MZS4 ZONE
CONNECTIONS
CLOSE
OPEN
COM
C
O/B
R Y G E
HEAT PUMP THERMOSTAT
D
A
M
P
E
R
M
O
T
O
R
T
H
E
R
M
O
S
T
A
T
R
G
E
C
CONNECTIONS
CLOSE
OPEN
COM
WIRING DIAGRAM 4 –
Typical Heat Pump Equipment
Compressor Relay
Reversing Valve
24V. Transformer
Second Stage Heat Relay
Emergency Heat Relay
Fan Relay
E
Q
U
IP
M
E
N
T
AIR TO AIR HEAT PUMP CONNECTIONS
HEAT PUMP CONTROLS
W2
W1
Y1
Y2
O
G
E
B
R
W3
Compressor Relay
Reversing Valve
24V. Transformer
Second Stage Heat Relay
Emergency Heat Relay
Fan Relay
E
Q
U
IP
M
E
N
T
AIR TO AIR HEAT PUMP CONNECTIONS
HEAT PUMP CONTROLS
W2
W1
Y1
Y2
O
G
E
B
R
W3
TROUBLESHOOTING
The MZS4 is a very simple control to troubleshoot, especially with the
LED indicators. The only other device needed is a simple Volt/Ohm
meter. Almost all problems can be traded to an external component or
wiring to the MZS4. While the MZS4 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
micro-processor 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 eliminate the problem. If not the following procedure
can help isolate the problem.
Zone(s) Not Calling
Each zone has a Green LED next to the zone relay when it is calling and
that calling is being recognized by the MZS4. If a zone is supposed to
be calling and the Zone LED is not on, check for 24VAC across the
thermostat terminal C and the 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
properly.
Zone(s) Will Not Shut Off
If a zone will not stop calling, the Zone LED should still be on.
Depending on the call disconnect the Y, W or G wire from the terminal
strip. The zone will drop out. Check the thermostat wiring for a mis-
wiring or short that keeps the zone calling.
Damper Motor Checkout
Each zone has Green indicaor light located to the right of the zone
damper’s relay. When all zones are satisfied all zone lights are lit Green
indicating all zone dampers will be Open. To check this there will be
24VAC across the COM and Open terminal. When any zone calls, the
damper(s) to the satisfied zone(s) will power close and the indicator light
will go out. When the damper is to be closed there will be 24VAC
across COM and CLOSE.
6 Aspen Drive
•
Randolph, New Jersey 07869 USA
Telephone 1.877.604.1044(US and Canada) FAX 1.201.794.1359
www.zonefirst.com
BOOT
