0 mechanical, 0 electrical supply and connections, 3 blowers, belts, and drives (cont'd) – Reznor RBL (Cabinet Blower) Unit Installation Manual User Manual

Page 10: Cont'd), Figure 15 - split taper bushing

Form I-RBL, P/N163219R2, Page 10

5.0 Mechanical

(cont'd)

Blower Pulley - Some blower pulleys require the use of a split taper

bushing in the blower pulley. These split taper bushings must be loos-

ened in order to remove the pulley. Follow these instructions to loosen

the bushing:

a) Notice that there are three cap screws in the bushing and two holes

without screws, called push-off holes.

b) Remove the three cap screws.

c) Put two of the cap screws into the two push-off holes. Tighten these

two screws evenly until the pulley is loosened.

d) Pulley may now be removed from the shaft.

Blower Bearings - The blower bearings on systems with less than a 10 HP motor

(standard blower) are permanently lubricated cartridge ball bearings and do not require

greasing.
The blower bearings on systems equipped with 10-20 HP motor are pillow block ball

bearings and are equipped with a grease fitting. (

NOTE: Units manufactured prior

to 1/91 with a 10 HP motor may have permanently lubricated ball bearings.) These

bearings should be lubricated twice a year with a high temperature, moisture-resistant

grease. (Type NLGI-1 or -2 standard grease is recommended.) Be sure to clean the

grease fitting before adding grease. Add grease with a handgun until a slight bead of

grease forms at the seal. Be careful not to unseat the seal by overlubricating. NOTE:

If unusual environmental conditions exist (temperatures below 32°F or above 200°F;

moisture; or contaminants), more frequent lubrication is required.
Blower Rotation - Each blower housing is marked for proper rotation. Rotation may be

changed on single-phase motors by re-wiring in the motor terminal box. Three-phase

motors may be reversed by interchanging two wires on the 3-phase supply connec-

tions.

FIGURE 15 - Split Taper Bushing

(3) Cap

Screws

(2) Push-

Off Holes

All electrical wiring and connections, including electrical grounding MUST be made in

accordance with the National Electric Code ANSI/NFPA No. 70 (latest edition) or, in

Canada, the Canadian Electrical Code, Part I-C.S.A. Standard C22.1. In addition, the

installer should be aware of any local ordinances or gas company requirements that

might apply.
Check the plate on the cabinet for the supply voltage and current requirements. A

separate line voltage supply with fused disconnect switch should be run directly from

the main electrical panel, making connection to leads in the junction box. All external

wiring must be within approved conduit and have a minimum temperature rise of 60°C.

Conduit from the disconnect switch must be run so as not to interfere with the service

panels of the cabinet. The unit must be electrically grounded in accordance with the

national Electrical Code, ANSI/NFPA No. 70 (latest edition or CSA Standard C22.1

when installed, if an external electrical source is used.

6.0 Electrical

Supply and

Connections

5.3 Blowers, Belts, and Drives (cont'd)

CAUTION: If any of

the original wire as

supplied with the

appliance must be

replaced, it must be

replaced with wiring

material having a tem-

perature rating of at

least 105°C.

If the installation includes field-installed options that require electrical connections, con-

sult the instruction sheet and wiring diagram supplied in the option package. Optional

shipped-separate controls could include system switches, potentiometer, a pressure

null switch, or a combination of these controls. Install these according to the manufac-

turer's instructions packed with the cabinet.

Motors - Use an amp meter to check

motor amps. The chart below lists full load

amps for various HP and voltages. Amps

may be adjusted downward by reducing

blower RPM or by increasing duct system

static pressure.
This chart should not be interpreted as the

exact amps. See the motor rating plate for

specific amps.

Full Load Amps - Blower Motors (Open)

(Single Speed- Average Values)

208/1 230/1 208/3 230/3 460/3 575/3

7.5

6.5

3.7

3.2

1.6

1.1

1-1/2

8.3

7.5

5.6

5.0

2.7

1.6

10.0

10.2

7.0

6.6

3.5

2.1

14.0

12.4

9.0

8.6

4.3

3.6

28.0

26.0

13.4

13.2

6.6

5.4

7-1/2

35.0

32.0

22.5

19.4

9.7

7.8

42.0

38.0

30.0

26.0

13.0

10.4

43.1

39.0

19.5

16.0

58.7

53.0

26.5

21.2

CAUTION: If the

blower is unused

for more than three

months, bearings

with a grease fitting

should be purged

with new grease

prior to start-up.