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CZ-4/CAZ-2 ADDING ZONES

AND TROUBLESHOOTING

MINIMUM ON TIMER

The CZ-4 also has a minimum on time whenever the compressor

operates in order to prevent frequent short cycling. Once there is a

call for cooling or the compressor on a heat pump, the CZ-4 will hold

that call for a period of 2 minutes.

CHANGEOVER TIMER

Whenever a call is made for either heating or cooling, the change-

over timer is activated in order to track the amount of time heating

or cooling is on. When an opposite call is made after a ﬁrst call is

existing the changeover timer calculates the amount of time the unit

has already been supplying the ﬁrst mode in order to determine how

long it will hold off the opposite call. If an opposite call is made shortly

after the ﬁrst call, the opposite call may be held off for as much as 20

minutes. If the ﬁrst call or subsequent calls for the ﬁrst call mode has

had that mode operating for up to 20 minutes already and an opposite

call comes in after 20 minutes, the changeover timer will immediately

recognize the opposite call, shutting off the current mode, enter the

purge mode and automatically switch to the opposite mode.

The longer a call has been running, up to 20 minutes, the shorter the

wait time will be for an opposite call. If a call is over 20 minutes and

an opposite call is made the changeover will be immediate following

the purge time. This intelligent changeover timing makes the CZ-4

unique to any other zoning system.

CAZ-2

The Zone Panel can be added onto with Model CAZ-2. The CAZ-2 is

available as a 2 zone adder panel and expands any CZ-4 panel to an

almost unlimited number of zones. The CAZ-2 panel is connected by

a 6 conductor RJ11 telephone cable. This makes wiring between the

CZ-4 and CAZ-2 literally a snap.

CHECKOUT

The CZ-4 has unique features that simplify the 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 will illuminate. This will stay illuminated constantly when

power is applied.

The System LED will provide several different indications based upon

color and if it is ﬂashing.

Heat ON – RED

Heat Limit – RED Flashing

Cool ON – GREEN

Cool Limit – GREEN Flashing

FAN ON – AMBER

PURGE – AMBER Flashing

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.

TROUBLESHOOTING

The CZ-4 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 traced to an external component

or wiring to the CZ-4. While the CZ-4 has been designed to oper-

ate under extreme voltage conditions and is fuse protected, like any

computer the micro-processor can hang up and not operate properly.

For those 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 releasing 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 CZ-4. If a zone is sup-

posed 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. De-

pending 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

To checkout the dampers, the panel provides 24VAC to the COM

and OPEN when the damper is to be open and 24VAC to COM and

CLOSE when the damper is to be CLOSED. When any zone is calling

and its Green LED is ON, there is 24VAC across COM and OPEN.

The only time a damper will close is when another zone is calling

and its zone is not calling. In this instance there will be 24VAC across

COM and CLOSE.

TECHNICAL HELP

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