Kelvinator JT4BE048KA Instruction Manual download pdf (Page 15)

DHUM

HUMIDISTAT

MOTOR

CONTROL BOARD

Figure 10. DHUM Wiring Conﬁguration

• Terminal4=Hispeed

• Terminal5=Medspeed

• Terminal6=Lowspeed

4. Replace the upper door and secure it to the unit.

5. Restore power to the unit.

High Efﬁciency Units (Variable & Fixed Speed)

IMPORTANT! This air handler has been designed to

give the installer maximum ﬂexibility to optimize system

performance, efﬁciency, and comfort. Because there

are so many different ways to set up the air handler it is

important to read and follow these directions carefully.

B6EM & B6VM air handlers use high efﬁciency circulating

air motors that come in two variations and both are

controlled differently. The ﬁxed speed motor control

board Figure 15 (page 24) controls the torque and the

variable speed motor control board (Figure 16) controls

the airﬂow at a constant CFM. Both boards use the same

control board.

Before operation, the air handler must be conﬁgured to

match the unit with the system, system options, and climatic

conditions. When conﬁgured, the air handler responds

directly to the thermostat inputs, as well as the optional

humidistat (see page 13). During normal operation, the

motor will gradually change speeds during start-up, shut

down, when thermostat inputs change, and when the duct

static pressure changes (vents closed or opened, ﬁlter

clogging, etc.). The air handler is conﬁgured by setting

the selector switches and removing jumper connectors.

Selecting Basic Heating Airﬂow

Fixed & variable speed motor control boards (Figure 15

(page 24) & Figure 16) contain a set of dip switches

for setting the blower speed. For B6EM models, pins 1-4

set the speed for heating. For B6VM models, the A/B

switch must be set for the appropriate cabinet size (either

setting can be used for C-size cabinets). The airﬂow is set

automatically based on the amount of installed heat. For

both B6EM & B6VM models, the cooling speed is selected

via switches 5,6,7,& 8. To determine the appropriate

switch settings for your installation, see Table 6, (page

20), Table 7, (page 21), Table 8, (page 21), or

Table 9, (page 22).

Selecting Basic Cooling / Heat Pump Airﬂow

The basic cooling/heat-pump airﬂow is controlled by setting

switches 5 - 8 on the motor control board (mounted on the

blower). All airﬂows for other modes of operation (except

electric heat) are determined by this basic setting. FAN

ONLY would deliver 50% of the selected cooling airﬂow.

Table 8, (page 21) lists the basic airﬂow values versus

the airﬂow selector switch settings and ranges of basic

air ﬂow settings recommended for each nominal system

capacity.

• When operating in the heat pump mode, a higher

basic airﬂow setting will increase the energy efﬁciency

and capacity but will also decrease the supply air

temperature.

• Formaximumcapacityandenergyefciency,selectan

airﬂow at or near the top of the range for that nominal

capacity. See Table 8, (page 21).

• Formaximumdehumidication,selectanairownearthe

middle or bottom of the range for that nominal capacity.

Additional information on humidity control can be found

in the Humidistat and Delay Setting sections.

• Forthermostatswithadehumidieroutput,useaeld

supplied wire to connect the thermostat’s dehumidiﬁer

output to the terminal marked DHUM. The thermostat

should be set so that the DHUM output should be high

(energized) when dehumidiﬁcation is needed. See also

Dehumidiﬁcation Options section.

IMPORTANT! If coil icing is observed, the basic cooling/

heat-pump airﬂow selected may be too low. Verify the

setting selected is within the range shown in Table 8 and

that the the system is properly charged. Please refer to

the instructions supplied with the outdoor unit. If icing

continues to occur, raise the selected airﬂow one or two

steps.

NOTE: Variable speed air handlers with SEER ratings

higher than 15 are matched with a 2-stage cooling outdoor

unit. They are programmed to operate at 75% of the

selected airﬂow while the system is in the lo-cool mode

and 100% of the selected airﬂow while in hi-cool mode.

Dehumidiﬁcation Options

(B6EM or B6VM Models Only)

Both motor control boards Figure 15 (page 24) & Figure

16 (page 24) have a DHUM connection that allows the

system to increase the amount of humidity that is removed

from the circulating air. This is accomplished by reducing

the CFM and allowing the cooling coil to become colder.

There are many ways that this can be electrically wired.

1. If the room thermostat incorporates a humidity sensor

and DHUM output, connect the DHUM on the thermostat

to the DHUM terminal on the motor control board.

2. If using a separate humidistat, connect the DHUM & R

terminals on the humidistat to the DHUM & R terminals

on the motor control board of the air handler. In this

option, the DHUM output of the humidistat must be set

to be normally open and closed when there is a call for

humidiﬁcation. See Figure 10.

3. For cooling only system: If a humidistat is not available,

it is an acceptable option to connect the R & DHUM

terminals on the motor control board together with a

ﬁeld supplied wire. This option causes the blower to run

at a reduced CFM for 10 minutes after a call for cooling.

NOTE: Heat pump systems must use a thermostat

with humidity sensor or separate humidistat to prevent

blower speed reduction in heat mode.

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Kelvinator JT4BE048KA Instruction Manual Page 15

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