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

Open the PDF directly: View PDF .
Page Count: 4

Lithe U.S.A.

,t_ 2001 Dattas, Texas, USA

INSTALLATION

INSTRUCTIONS

These instructions are for CB17-185, CBH17-185,

CB17-275, and CBH17-275. These instructions are in-

tended as a general guide and do not supersede national

or local codes in any way. Consult authorities who have ju-

risdiction before installation.

CB17 & CBH17 Series Units

BLOWER COIL UNITS _ Technical

504,438M J_L Publications

11/2001 LithoUSA

Supersedes 502,512M

CB17 blower coil units are designed for indoor vertical ap-

plications only. CBH17 blower coil units are designed for

indoor horizontal applications only. Figure 1 shows a typi-

cal CB17 installation. Figure 2 shows a typical CBH17

installation.

CB17

Upflow Installation

Figure 1

OU_OOA

A_R

R_URN

<>

CBH17 su_v

Suspended Horizontal Installation

Figure 2

AIMPORTANT

General Information ............................. 1

CB17 & CBH17 Series Units ...................... 1

Shipping & Packing List .......................... 1

Blower Motor Drive Kit Selection .................. 1

Installation ..................................... 2

Refrigerant Piping Connections ................... 2

Wiring ......................................... 3

Condensate Drain Connection .................... 4

Duct Connections ............................... 4

Determining the Unit's Air Volume ................. 4

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

Blower Coil Unit

Package 1 of 2 contains the following:

1 - Assembled blower coil unit

1 - Plastic bag -

1 - Condensate drain plug

1 - Blower drive belt

6 - Plastic grommets

Blower Motor Drive Kit

Package 2 of 2 contains the following:

1 - Blower motor pulley

1 - Blower motor

1 - Plastic bag containing blower motor bolts and wash-

ers

Check equipment for shipping damage. If you find any da-

mage, 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 Page 1

504,438M

IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

Table 1

Blower Motor Drive Kits

Nominal Maximum RPM Range of

Model Motor Usable All Available

Number Horse- Horse- Drive Setups

power power @ 1725 RPM

(kW) (kW) 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

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

*Not available for U.L. listed units

** 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.

Motor

Pulley

Suction Line

Connections Motor Wiring

Box

side)

Motor Adjustment Bolt

Figure 3

4 - Install the blower motor pulley and belt,

5 - Adjust the motor mounting plate for proper belt ten-

sion, Ideal tension is the lowest tension at which the

belt will not slip under peak load conditions. Over-

tightening 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

own suction line connection and expansion valve or valves.

This configuration allows the use of a solenoid valve to con-

trol the flow of refrigerant into one coil section. Use this fea-

ture for capacity reduction or latent heat control, If a sole-

noid 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.

Connect the refrigerant piping from the bottom coil section

to the first-stage condensing unit.

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 pres-

sure 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,

3 - Remove the plugs from the suction line and from the

two liquid line stubs,

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 suc-

tion and liquid line stubs, replace the expansion val-

ve bulbs, Ensure that each bulb is tightly clamped to

the suction manifold.

NOTE -The expansion valve bulbs must be rein-

staffed in their original factory location,

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

tion

Page 2

NOTE -Complete all refrigerant piping connections be-

fore installing the blower contactor kit,

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,

1 - Remove the knockout,

_

_

4 - Secure the strain relief bushing to the blower motor

wiring box,

5 - Insert the adapter bushing into the 7/8 inch (22 mm)

hole in the motor wiring box,

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,

NOTE -If an electric heat section has been installed in

the unit, the blower contactor kit is not required. The cab-

inet is equipped with knockouts for the wiring from the

blower motor to the electric heat system.

Install the plastic bushing,

Position the box over the plastic bushing and secure

the blower contactor kit (LB-51207CB), Refer to fig-

ure 4 for field wiring,

- %JZ_

S4

K36 _

_> K3S

q

LI)U] MEN

GROUND _

T

A

A

K36

24V POWER

A

ECON

o

w2

DESCRIPTION

<EY COMPONENT

B3 MO]ORoBLOWER

:1 FUSE-1RANSFORMER ]1

<5, I CONTACTOR BLOWER

(56,-I RELAY HEAT BLOWER

(45,-I RELAY-ECONO HEAT

_42 REIAY-OVERLDAD,BLO,MOTOR

11 ]RANSFORMER_CONfROL

MAXIMUM OVERCURRENT PROTECTION

SIZE

USE COPPER CONDUCTORS ONLY

A FIELD PROVIDEB,24V TRANSFORMER-

45VA MINIMUM REOUIREMENT

_MAXIMUM LOAD NOT TO EXCEED

45VA AT 24V,CLASS 2

A STANDARD WIRINg

OPTIONAl WIRING WHEN

K43 RELAY IS EMPLOYED

24V COMMON

WIRING FOR SINGLE

PHASE: BLDWE:R MDTDR AS42 IS USED ON "M" VOLTAGE

LL_ UNITS & UNITS WITH HIGH

EFFICIENCY MOTORS.

_ _ / --LINE VOLTAGE TO BE INSTALLED

Ld U_ L_

ACCESSORIES

_" CB/CBH 7

A ......... WITHOUT ELECTRIC HEAT

SECTION A

Supersedes Form No, [ New Form No,

552,210W 555,755W

(_) 200_ L fho U.S.A.

Figure 4

Page 3

Theunitisequippedwithacondensatedrainoutletoneach

side.

1- Installtheprovideddrainpluginthecondensateout-

letthatwillnotbeused,

2- Installcondensatepipingusingproperlysizedfield-

providedfittings,

3- Installa trapinthedrainlinewherethedrainexits

theunit.

4- Pitchthedrainlinedownwardtotheopendrainor

sump,

NOTE -Never connect the condensate drain to a

closed system,

5 - Use plugged tees where possible to facilitate clean-

ing the drain lines.

If a return air plenum is not used. installation codes may

limit installation to single-story structures only.

Table 2

Do not install the supply air plenum within 18 inches (457

mm) of the blower access panel,

NOTE -Use flexible duct to eliminate vibration,

NOTE -The indoor coil must be dry and the air filters

must be in place when the following measurements are

taken,

1 - Run the blower without a cooling demand,

2 - Measure the static pressure external to the unit,

3 - Measure the indoor blower motor's rpm,

4 - Refer to tables 2 and 3, Use the static pressure and

rev/min* readings to determine the unit's air volume.

5 - Adjust the unit's air volume at the blower motor

pulley. Loosen the Allen screw, Turn the adjustable

sheave clockwise to increase the air volume or

counterclockwise to decrease the air volume. See

figure 3.

CB17-185V and CBH17-185V Blower Performance

Static Pressure External to the Unit -- Inches Water Gauge (Pa)

Air Volume .35 .45 .55 .65 .75 .85 .95 1.05 1.15

cfm (L/s) RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

5000 630 1.50 640 1.55 660 1.65 685 1.75 720 1.90 750 2.05 785 2.15 820 2.30 855 2.55

5500 635 1.65 650 1.70 680 1.85 710 2.05 740 2.20 775 2.35 805 2.45 845 2.70 780 2.80

6000 640 1.90 675 2.10 705 2.20 730 2.35 760 2.50 790 2.60 830 2.80 855 3.00 .......

*6500 670 2.25 700 2.35 725 2.50 750 2.65 780 2.75 820 3.00 850 3.20 ..............

7000 690 2.55 720 2.65 745 2.85 775 3.00 810 3.20 840 3.35 .....................

7500 720 2.90 740 3.05 775 3.25 800 3.40 835 3.55 ............................

8000 740 3.30 775 3.50 800 3.65 835 3.85 ...................................

NOTE -All data is measured external to the unit with air filters in place.

*6500 cfm minimum with electric heat

Table 3

CB17-275V and CBH17-275V Blower Performance

Static Pressure External to the Unit iInches Water Gauge (Pa)

Air Volume .60 .70 .80 .90 1.0 1.1

cfm (L/s) RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP

2.25 690 2.30 720 2.45 740 2.50 765 2.70 795 2.85 815 3.05

2.45 705 2.55 730 2.70 755 2.80 780 2.85 810 3.20 825 3.35

2.65 720 2.80 740 2.90 770 3.15 800 3.35 820 3.55 835 3.70

2.95 730 2.05 760 3.35 785 3.40 815 3.70 830 3.85 850 4.00

3.20 745 3.35 775 3.60 805 3.80 825 4.00 850 4.35 .......

3.55 760 3.75 795 4.00 820 4.20 850 4.55 860 4.65 .......

3.90 785 4.15 815 4.40 840 4.65 860 4.85 ..............

4.35 805 4.55 835 4.85 860 5.15 .....................

4.75 830 5.05 860 5.40 ............................

unit with air filters in place.

.40 .50

RPM BHP RPM BHP

6500 635 2.00 670

*7000 650 2.30 680

7500 665 2.55 685

8000 675 2.80 705

8500 690 3.10 720

9000 710 3.40 735

9500 730 3.75 755

10,000 750 4.10 775

10,500 775 4.60 800

NOTE -All data is measured extemaltothe

*7000cfmminimumwith electric heat

Page 4