Carrier 48ES Instruction Manual download pdf (Page 24)

Continuous Fan Operation

When the DEHUM feature is not used, the continuous fan speed

will be the same as cooling fan speed. When the DEHUM feature

is used, the continuous fan speed will operate on IFB “LOW”

speed when the DH control lead is not energized, or IFB “HIGH”

speed when the DH lead is energized (see Fig. 17).

COMLOWHIGH

GAS

HEAT

Q1R1LC8RL3

DCR QCR

QC1

D4D6C2OILL

R9 AB A15

R4 RL4

R3 R5 R6

QCB

YRUC24VAC

JW1

Y2/ Y1/

YDH

GCR

SSTZ-8

SDL

24VAC/R

CDM/C

QC6 QC7 QC4 QC3

K2 K1

RI0

RI2

JM6

RI DL

JM5

D3D5

JW3

JW2

JW4

JW7

3 AMP

A09058

Fig. 17 -- Interface Fan Board (IFB)

Table 6 – Color Coding for Indoor Fan Motor Leads

Black = High Speed

Orange = Med--- High Speed

Red=MedSpeed

Pink = Med--- Low Speed

Blue = Low Speed

Cooling Sequence of Operation

With the room thermostat SYSTEM switch in the COOL position

and the FAN switch in the AUTO position, the cooling sequence

of operation is as follows:

1. When the room temperature rises to a point that is slightly

above the cooling control setting of the thermostat, the

thermostat completes the circuit between thermostat

terminal R to terminals Y and G.

2. The normally open contacts of energized contactor (C) close

and complete the circuit through compressor motor

(COMP) to condenser (outdoor) fan motor (OFM). Both

motors start instantly.

3. The set of normally open contacts on the interface fan board

(IFB) are closed which energizes a circuit to the indoor fan

motor (IFM).

NOTE: Once the compressor has started and then stopped, it

should not be started again until 5 minutes have elapsed. The

cooling cycle remains on until the room temperature drops to a

point that is slightly below the cooling control setting of the room

thermostat. At this point, the thermostat breaks the circuit between

thermostat terminal R to terminals Y and G. These open circuits

deenergize contactor coil C. The condenser and compressor motors

stop. After a 90--sec. delay, the blower motor stops. The unit is in a

standby condition, waiting for the next call for cooling from the

room thermostat.

48ES-- A

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Carrier 48ES Instruction Manual Page 24

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