White Rodgers 1F85-277 Instrukcja Naprawy Pobierz pdf (Strona 129)

continue to run in order to adequately provide conditioning for each

mode. If a particular mode has already been calling for 20 minutes or

longer and an opposite call comes in the CMM-3U will immediately

drop the mode, enter the purge mode in order to dissipate the condi-

tioned air into the zones calling before switching over to provide the

new conditioning call to its zones.

When using the CMM-3U to control two stage heating, the second

stage is controlled based upon time after the ﬁrst stage call from the

thermostat. When any zone calls the panel’s built-in timer begins and

after the set period of time elapses the CMM-3U will also activate the

W for second stage heating. The Second Stage Timer is adjustable

between 2, 4, 8 or 16 minutes after the ﬁrst stage calls. Once the

second stage is on, it will continue to run until the ﬁrst stage is satis-

ﬁed.

Once all zone thermostats are satisﬁed for heating and cooling, the

CMM-3U can now accept Fan calls allowing Continuous Air Circula-

tion (CAC) in those zones where the thermostat’s Fan Switch is set

to ON. These zone dampers will be Open while the dampers to the

zones where the Fan Switch is set to AUTO will be CLOSED.

When all zone thermostats are satisﬁed for both Heating and Cool-

ing, and all Fan switches are set to AUTO position, the HVAC unit will

be off and all zone dampers will return to a normally open position.

Once a zone calls for heating, cooling or fan, the dampers to the

calling zones remain open and the dampers to the zones not calling

will close.

SET-UP FOR VARIOUS HVAC EQUIPMENT

The CMM-3U is factory set for conventional heating and cooling

operation. The panel only needs to be conﬁgured when using with an

electric furnace or heat pumps.

Most all of the panel conﬁguration is done by setting the DIP switches

in the top right of the panel. Other functions come by wiring for spe-

ciﬁc applications. Below is shown the most typical settings. Review

each function for you application.

1. SYSTEM – G/E OR HP This switch sets the HVAC Output

operation. In G/E the Y1 operates as ﬁrst stage cooling only.

In HP position Y1 makes as the compressor call for both

heating and cooling.

2. HP Type – CONV or FF – This switch is used to determine

the equipment output when the System switch is set to HP,

this switch determines if the output will be for a conventional

heat pump with electric back-up heat or fossil (dual) fuel

mode.

3. FAN IN HEAT – YES or NO – This switch will activates the

Fan on a call for Heat in the Yes position. In Off, the heating

unit must activates the fan when the heat is called.

4. FAN PURGE – YES or NO – This switch determine if the Fan

is kept on during the Purge Mode, after the end of each heat

or cool call.

5. STAT RV – O or B – When using HP type thermostats this

determines if the O or B terminal is wired to the W/OB termi-

nal on each thermostat to determine if the call if for Heat (B)

or Cool (O).

6. TSTAT – HC-HP Switch determines if conventional Heat/Cool

thermostats or Heat Pump thermostats are being used for

ALL zones. A conventional HC stat would have separate W

and Y output for heating and cooling calls. A HP thermostat

uses Y for both a heat and cool call and the O or B is used to

determine whether the call is for Cooling (O) or Heating (B).

7. EM HEAT – This switch sets any heat call to call for the Emer-

gency Heat. The Red EM HEAT LED on the panel will light

only when this switch is ON. This is used when there is no

EH switch on the thermostats.

8. TEST – This switch accelerates the panel timings in order to

provide a quick checkout of all of the functions without hav-

ing to wait the full time for each sequence.

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 DIP switch settings is all that is needed.

LEAVING AIR SENSOR (CLAS)

The Leaving Air Sensor, Model CLAS, is a remote sensor that is

located in the supply air duct to sense the Leaving Air temperature

of the HVAC Unit. The LAS is a high limit protection for the heating

and a low limit protection for the cooling. When zoning, the airﬂow

through the HVAC Unit is critical. The CLAS protects the equipment

in low air ﬂow situations as well as when by-pass air is being directed

back into the return air duct.

The heating limit is adjustable from 110°F to 170°F. The cooling limit

is ﬁxed at 45°F. When the CLAS senses heating above its set point,

or cooling below its set point, the CMM-3U will drop both all stages

of heating or cooling. The CLAS must sense a 10°F fall for heating or

rise for cooling before re-activating the ﬁrst stages of heating or cool-

ing. If two stage heating or cooling is being used the second stage

timer will start again once the ﬁrst stage is re-activated.

110

120

130

140

150

160

170

HIGH LIMIT

The CLAS requires 2 wires from the sensor to the LAS terminals on

the CMM-3U panel.

LAS

OAS

Leaving Air Sensor

In Supply Air Duct

Outdoor Air Sensor only used with

Fossil/Dual Fuel Applications

OUTDOOR AIR SENSOR (COAS)

The Outdoor Air Sensor is used only when using a Heat Pump with

Dual/Fossil Fuel back-up furnaces. The COAS senses the outdoor

air temperature and switches the heating control between the heat

pump and the fossil fuel furnace. The temperature set point for this

is adjustable on the Outdoor Balance Point (OBP) dial on the control

panel. It is adjustable from 5°F to 53°F. It is suggested that this be set

just above freezing to avoid the heat pump from potentially going into

Defrost mode.

OBP

Stage Timer

The CMM-3U has a built-in stage timer that eliminates the need

and added cost of using two stage thermostats. On a call for either

heating the timer begins. Setting the Stage Timer dial provides a

adjustable time delay of 5 to 21 minutes between the ﬁrst and second

stage calls and the same between a second stage and third stage

call of heating, if used.

STAGE TIMER

CMM-3U

CMM-3UKZONE PANEL

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