CONSTANT VOLUME FAN POWERED TERMINAL UNIT

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THIS DOCUMENT IS THE PROPERTY OF

CARRIER CORPORATION AND IS DELIVERED

UPON THE EXPRESS CONDITION THAT

THE CONTENTS WILL NOT BE DISCLOSED

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CONTRACT

01/30/2003

45J/K/Q-P-1312

PRODUCT INFORMATION IS SUBJECT TO CHANGE WITHOUT NOTICE.

MULTI FUNCTION, RA-NC

PNEUMATIC CONTROL

SEQUENCE 1312

PRIMA RY FLOW

ELECTRIC HEA T

HW HEAT

INDUCED FLOW

100

% CAPACITY

T-STAT PRESSURE

CONSTANT VOLUME FAN POWERED

TERMINAL UNIT PNEUMATIC CONTROL

SEQUENCE 1312

RANC, Multi-Function Control of VAV With Optional

Reheat, and Constant Volume Fan Operation

1312 — User defined primary air flow setpoints are main-

tained regardless of central system pressure, while terminal

fan runs continuously. Primary air flow is controlled by a multi-

function reset volume controller. If necessary, the user can

opt to field adjust reset start, reset span, select N.O. or N.C.

damper by turning a dial, and choice of using Direct or

Reverse acting thermostats.The controller is factory set

to provide the following sequence of operation:

Under load for cooling, primary air flow is at maximum when

the thermostat (Reverse Acting), is at or below 3 psig.Primary

air flow should not exceed fan air flow setpoint.When thermo-

stat branch pressure increases, primary air flow reduces to

the user defined minimum air flow setpoint at 8 psig. As primary

air flow is reduced, the constant volume terminal fan propor-

tionally induces ceiling plenum return air or ducted return air,

to maintain a constant volume of air to the occupied space.

Under a load for heating, thermostat branch pressure will

continue to increase.Optional, proportional hot water heat

(8-13 psig),or sequenced on/off staged electric heat (up to

3-stages), will be initiated in response to the thermostat signal.

Pneumatic air consumption of the multi-function controller

is 28.8 scim at 20 psig (.472 l/m @ 138 kPa). Upon a loss

of Subject pneumatic air, the terminal damper fails closed

(Normally Closed).

JP,KP,QP