Middleby Marshall PS555, PS570 manual Early-style PS200 indirect drive assembly, Blower motor fuses

SECTION 3 - SERVICING COMPONENTS

V. BLOWERS

A. PS200-series ovens

All PS200 ovens are equipped with one 1/3hp blower mo- tor. The motor indirectly drives a pulley on the shaft of the blower fan with a fan belt.

Two main designs exist for the PS200 indirect fan drive assembly:

•Early design, used through 6/90. This design used 1/2” (12.7mm) bore flange mount bearings and a 1/2” (12.7mm) diameter blower fan shaft. See Figure 25.

•Current design, used 7/90 and later. This design uses 5/8” (15.9mm) pillow block bearings and a 5/8” (15.9mm) diameter blower fan shaft. See Figure 26.

Blower motors on both versions are rated for 208-240V, single-phase, and are protected by:

•A built-in thermal overload protection device.

•Two 9A fuses on the inside of the machinery compart- ment door. Fuse location is shown in Figure 27.

In addition, the blower fan is protected by an air pressure saftety switch that prevents the burner/heating elements from activating if the fan is not rotating. See Air Pressure Safety Switch on Page 81.

1.Part number reference Early version components

NOTE: If an early-version PS200-series oven has a failed fan shaft, upgrade the oven to the current drive assembly using Kit P/N 49810-0121.

Part Number Description

22230-0072	Pulley, 1/2” / 12.7mm bore
22071-0019	Bearing, 1/2” / 12.7mm bore, flange
	mount
37900-0094	Fan shaft alignment tool (early)
27381-0066	Motor, 1/3 hp, 200-240V, 50/60Hz ,1 Ph
22181-0034	Fan belt

Current version components

Part Number Description

35900-0232	Shaft, blower fan
22230-0073	Pulley, 5/8” / 15.9mm bore
22072-0025	Bearing, 5/8” / 15.9mm bore, pillow
	block mount
27399-0003	Blower fan, 16” / 0.4m diameter
37900-0106	Fan shaft alignment tool (current)
49810-0121	Indirect drive upgrade kit (upgrades
	early-style version to current version)
49810-0018	Fan shaft service kit (includes 2 bear-
	ings, 1 shaft, and alignment tool )
27381-0066	Motor, 1/3 hp, 200-240V, 50/60Hz ,1 Ph
22181-0034	Fan belt

Figure 25

Early-style PS200 indirect drive assembly

Direction of rotation

(viewed from rear of oven)

Figure 26

Current PS200 indirect drive assembly

Direction of rotation

(viewed from rear of oven)

Figure 27

Blower motor fuses

Blower

motor fuses

Control

fuse

68