White Rodgers 1F85-277 Instrukcja Naprawy Pobierz pdf (Strona 130)

CMM-3U

CMM-3UK

PURGE TIME

The CMM-3U has a built-in Purge Time after each call is satisﬁed

and provides a minimum off time before another call is initiated. The

Purge Time is set at 2minutes after all calls for a particular mode are

satisﬁed or when the Changeover Timer requires a changeover due

to opposing calls.

After all calls are satisﬁed or the changeover timer activates, the

Purge Timer begins and the heating or cooling, whichever was on,

is deactivated. Typically the fan may be running during this time and

the damper(s) to the last zone(s) calling will remain open to purge the

conditioned air only into those zones that were calling for the condi-

tioning. DIP Switch 4 can be set ON to keep the Fan running during

the Purge mode in order to prevent the fan cycling off and back on

between modes. In the instance where the Fan staying on may cre-

ate a draft, and the frequency of opposite calls is minimal this switch

can be kept to OFF.

Minimum On Timer

The CMM-3U 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 CMM-3U 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 im-

mediately 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 CMM-

3U unique to any other zoning system.

CHECKOUT

The CMM-3U has unique features that simplify the checkout of the

system and has LED readouts that constantly indicate the system op-

eration. 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 Sys-

tem 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.

WIRING

The CMM-3U is very simple to wire and requires only a minimum

number of connections. The CMM-3U terminal blocks are color coded

and screw-less for all wires to be easily pushed into their respective

terminal by de-pressing the button for each point and releasing once

the wire is seated. (Solid wire can often just be pushed into the termi-

nal without de-pressing the button.) To remove the wire, just press its

button again and remove the wire.

Zone Dampers – The CMM-3U can power any 24VAC damper, ei-

ther 2 wire or 3 wire. See speciﬁc wiring instructions with the damper

or inside panel cover. The three damper motor contacts are for

24VAC power are COM (Common), OPN (Open) and CLS (Closed).

Two wire, spring return, normally open dampers use only COM and

CLS terminals.

COM

OPN

CLS

Zone Thermostats – The thermostats wiring will be for Conventional

single stage (Y-G-R-W-C) or Heat Pump (Y-G-R-E-C and O or B).

See Wiring Diagram 1and 2 each type of thermostat.

WIRING DIAGRAM 1 – Conventional Thermostats

C W R Y G

W2/E

W/OB

CONVENTIONAL THERMOSTAT

WIRING DIAGRAM 2 –

Heat Pump Thermostat

C O/B R Y G W2/E

W2/E

W/OB

HEAT PUMP THERMOSTAT

WIRING DIAGRAM 3 - HVAC Equipment – Single

Stage Heating Cooling with Gas/Electric Heating.

Y1 FIRST STAGE COOL

G FAN RELAY

R 24VAC TRANSFORMER C

W1 FIRST STAGE HEAT RELAY

W2 SECOND STAGE HEATING RELAY

W1/B

W3/E

ZONE PANEL

TECHNICAL HELP

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