LENNOX Air Handler (indoor Blower&evap) Manual L0805359

User Manual: LENNOX LENNOX Air Handler (indoor blower&evap) Manual LENNOX Air Handler (indoor blower&evap) Owner's Manual, LENNOX Air Handler (indoor blower&evap) installation guides

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INSTALLATION
INSTRUCTIONS

Lithe U.S.A.
,t_ 2001 Dattas, Texas, USA

These instructions are for CB17-185,
CBH17-185,
CB17-275, and CBH17-275. These instructions are intended as a general guide and do not supersede national
or local codes in any way. Consult authorities who have jurisdiction before installation.

CB17 blower coil units are designed for indoor vertical applications only. CBH17 blower coil units are designed for
indoor horizontal applications only. Figure 1 shows a typical CB17 installation. Figure 2 shows a typical CBH17
installation.

CB17 & CBH17 Series Units
BLOWER

COIL

UNITS

_

504,438M
11/2001
Supersedes 502,512M

Technical
J_L

Publications

LithoUSA

General Information .............................
CB17 & CBH17 Series Units ......................

1
1

Shipping & Packing List ..........................
Blower Motor Drive Kit Selection ..................
Installation .....................................

1
1
2

Refrigerant Piping Connections ...................
Wiring .........................................
Condensate Drain Connection ....................
Duct Connections ...............................

2
3
4
4

Determining the Unit's Air Volume .................

4

RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE

CB17

Blower Coil Unit
Package 1 of 2 contains the following:

Upflow Installation

1 - Assembled blower coil unit

Figure 1

1 - Plastic bag R_URN

1 - Condensate drain plug

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1 - Blower drive belt
6 - Plastic grommets

OU_OOA

Blower
CBH17

A_R

su_v

Motor Drive Kit

Package 2 of 2 contains the following:
1 - Blower motor pulley

Suspended Horizontal Installation
Figure 2

A IMPORTANT

1 - Blower motor
1 - Plastic bag containing blower motor bolts and washers
Check equipment for shipping damage. If you find any damage, immediately contact the last carrier,

The blower motor drive kits listed on the unit nameplate
and in table 1 are available for use with the CB17 and
CBH17 units.

11/01

IIIHIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

504,438M
Page 1

IIIIIIIIIIIIIIIIIIIIIIIIIIIII

Table 1

4 - Install the blower motor pulley and belt,

Blower Motor Drive Kits
Nominal
Motor
Horsepower
(kW)

Maximum
Usable
Horsepower
(kW)

RPM Range of
All Available
Drive Setups
@ 1725 RPM
Motor Speed

DKB17-185
/275-2-10

2.0 (1.5)

2.30 (1.7)

520-660

*DKB17-18
5/275-2-11

2.0 (1.5)

2.30 (1.7)

520-660

Model
Number

5 - Adjust the motor mounting plate for proper belt tension, Ideal tension is the lowest tension at which the
belt will not slip under peak load conditions. Overtightening the belt will shorten the life of the belt and
bearings,
6 - Tighten the motor mounting plate bolts and recheck
the belt for proper tension.

The coil is divided into two sections, Each section has its
DKB17-185
/275-3-12

3.0 (2.2)

3.45 (2.6)

600-750

*DKB17-18
5/275-3-13

3.0 (2.2)

3.45 (2.6)

600-750

DKB17-185
/275-5-14

5.0 (3.7)

5.75 (4.3)

690-830

*DKB17-18
5/275-5-15

5.0 (3.7)

5.75 (4.3)

690-830

own suction line connection and expansion valve or valves.
This configuration allows the use of a solenoid valve to control the flow of refrigerant into one coil section. Use this feature for capacity reduction or latent heat control, If a solenoid valve is used, install it directly ahead of the expansion
valve of the coil section being controlled. Size the solenoid
valve for approximately 50 percent of the total evaporator
unit capacity.

*Not available for U.L. listed units

Connect the refrigerant piping from the bottom coil section
to the first-stage condensing unit.

** RPM (revolutions per minute)

1 - Remove the blower access panel,
2 - Use the provided bolts and washers to install the
blower motor on the motor mounting plate. Refer to
figure 3,
3 - Make wiring connections per the wiring section and
figure 4.

The expansion valves are sized specifically for the two
stages. The CB17/CBH17-185 has a 7-1/2-ton first- and
second-stage expansion valve. The CB17/CBH17-275
has two 5-ton first- and second-stage expansion valves,
Because of the two-section coil configuration, take care in
piping the system, Refer to the condensing unit installation
instructions to properly type and size the refrigerant lines
for these coils.
NOTE - CBf 7 and CBHf 7 series evaporator coils have a
holding charge of nitrogen or dry air, If there is no pressure when the rubber plugs are removed, check the coil
or line set for leaks before installing, After installation,
puff a vacuum on the line set before releasing the unit
charge into the system.
1 - Route piping through either side of the unit.
2 - Remove the knockouts from the piping mullion.
Install the rubber grommets into the piping holes,

Motor

3 - Remove the plugs from the suction line and from the
two liquid line stubs,

Pulley

Suction Line
Connections

Motor Wiring
Box
side)

Motor Adjustment

Figure 3

4 - Note the location of the factory-installed expansion
valve bulbs. Remove the expansion valve bulbs from
the manifold so that the heat of the torch will not
damage them during brazing.
5 - After connecting the refrigerant piping to the coil suction and liquid line stubs, replace the expansion valve bulbs, Ensure that each bulb is tightly clamped to
the suction manifold.
NOTE - The expansion valve bulbs must be reinstaffed in their original factory location,

Bolt

6 - Insulate the suction line with a tubular slip-on insulation

Page 2

4 - Secure the strain relief bushing to the blower motor
wiring box,
NOTE - Complete all refrigerant piping connections before installing the blower contactor kit,

5 - Insert the adapter bushing into the 7/8 inch (22 mm)
hole in the motor wiring box,

Electrical connections must comply with local codes. Refer
to figure 4 for blower coil field wiring only. Electrical conduit
knockouts are provided in the piping mullion,

6 - Secure the strain relief bushing at the motor wiring
box.
7 - Route the blower motor leads away from sharp
edges, Motor leads may need to be trimmed,

1 - Remove the knockout,
_

Install the plastic bushing,

NOTE - If an electric heat section has been installed in

_

Position the box over the plastic bushing and secure
the blower contactor kit (LB-51207CB), Refer to figure 4 for field wiring,

the unit, the blower contactor kit is not required. The cabinet is equipped with knockouts for the wiring from the
blower motor to the electric heat system.
24V

POWER

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