Miele PDR 922 Commercial Tumble Dryers Installation Guide

: June 14, 2024
: Miele

Table of Contents

Miele PDR 922 Commercial Tumble Dryers
Installation notes
Optional accessories
PDR 922/522, heated with steam
Technical data
Machine data
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Miele PDR 922 Commercial Tumble Dryers

Miele-PDR-922-Commercial-Tumble-Dryers-product

To prevent accidents and machine damage, read these instructions before installation or use.

Installation notes

Installation requirements
Risk of injury or damage to property due to improper installation.

Incorrect installation of the tumble dryer can lead to personal injury or damage to prop-erty.
It is recommended that installation and commissioning be accomplished by Miele Ser-vice or an authorized dealer.
Observe all local codes.
The tumble dryer must be installed in accordance with all relevant regulations and stan-dards.
The dryer must only be operated in a room that has sufficient ventilation and which is frost-free.
The tumble dryer must not be installed behind a closeable door or a sliding door. The maximum opening angle of the tumble dryer door must not be limited by objects or doors. It must be possible to fully open the tumble dryer door at any time.

Steam connection
The steam connection must only be carried out by a registered installation technician. The information from the data plate, the wiring diagram, and the documentation accompanying the machine must be noted and complied with when connecting steam-heated Miele ma-chines.

Condensate connection
The condensate separator must be installed such that when the system is not operating, the heater bank is completely emptied. This means that no condensate may remain in the heater bank. The installation of an inverted bucket condensate trap is recommended.

Floor anchoring
Miele generally recommends securing both of the tumble dryer’s front screw feet to the floor with tensioning strips.

In the following cases, the tumble dryer must be secured to the floor with tensioning strips:

when installing on a base
on an offshore installation

Supply air/exhaust air
The tumble dryer may only be operated when the ducting has been connected properly and the room is sufficiently ventilated.

Optional accessories

Only use genuine Miele spare parts and accessories with this machine.
Using parts or accessories from other manufacturers may void the warranty, and Miele cannot accept liability.

Communication box
The optional communication box allows external hardware from Miele and other suppliers to be connected to the Miele Professional machine. External hardware includes e.g., peak-load systems, pressure sensors, or an external vent flap.

The communication box is supplied with voltage by the Miele Professional machine.
The separately available set consists of the communication box and fasteners for installa-tion on the machine or on the wall.

XKM 3200 WL PLT
The optional Miele communication module can be used to establish a data connection be-tween a Miele Professional machine and a data processor in accordance with the Ethernet or WiFi standard.

This communication module fits into the communication slot which is a standard feature on all machines. The communication module offers the option of intelligent app-based communication with external systems. In addition, it can display detailed machine and pro-gram status information.
This module forms the basis for wired communication with Miele MOVE.
It is not possible to integrate the machine into the “Miele@home” app for domestic in-stallations.
The communication module is intended exclusively for commercial use and is supplied with voltage directly via the Miele Professional machine. No additional power connection is required. The Ethernet interface provided via the communication module complies with SELV (safety extra low voltage) requirements in accordance with EN 60950. Connected external machines must also comply with SELV.

Supply air, exhaust, and ventilation cross-sections

Supply air/exhaust air
The tumble dryer may only be operated when the ducting has been connected properly and the room is sufficiently ventilated.

Calculating the total length and diameter of a supply-air or exhaust pipe
The length of the required ductwork and the number and shape of the elbows are deter-mined by the structural conditions on-site. In order to maximize the airflow efficiency, the pipeline should be as short as possible and contain few or minimal elbows.

The exhaust ducting must not be made from flammable materials. Otherwise there is a risk of fire.
Use only non-flammable materials for the exhaust ducting. All local regulations for metallic ducting must be observed. Plastic must not be used for ventilation.
In upward exhaust ducting systems, a condensate drain must be fitted to the bottom. The condensate must be drained via a water collection tray or a floor drain positioned in an ap-propriate location.
If air is being directed from multiple appliances into a combined line (exceptional circum-stances), a non-return device (non-return flap) must be installed in each separate line to prevent backflow.
To make subsequent cleaning of the pipes easier, cleaning flaps should be fitted to elbows wherever possible.
The on-site exhaust ducting and venting to the outdoors must be regularly checked for lint deposits and cleaned if necessary.

Substitute duct lengths

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Maximum permissible total ducting length

Internal minimum pipe diameter

(metal ducting)

| PDR x14 SI| PDR x18 SI| PDR x22 SI| PDR x28 SI| PDR x44 SI
---|---|---|---|---|---
5 7/8″ (150 mm)| 62′ 4 1/16″

(19 m)

| 49′ 2 9/16″

(15 m)

| 39′ 4 7/16″

(12 m)

| 32′ 9 11/16″

(10 m)

| 32′ 9 11/16″

(10 m)

7 1/16″ (180 mm)| 164′ 1/2″ (50 m)| 124′ 8 1/16″

(38 m)

| 101′ 8 1/2″

(31 m)

| 88′ 7″ (27 m)| 78′ 8 7/8″

(24 m)

7 7/8″ (200 mm)| 278′ 10 7/16″

(85 m)

| 213′ 3 1/16″

(65 m)

| 173′ 10 5/8″

(53 m)

| 157′ 5 3/4″

(48 m)

When connected to the vent ducting through the exhaust duct of a machine, particular care must be taken to make sure the connection is secure and air-tight.
With complex ducting with many bends and additional components, or when several dif-ferent machines are connected to a shared duct, it is recommended that a detailed pipework calculation is carried out by a qualified specialist.
The vent ducting must not be channeled into a chimney or flue already in use for any gas-, coal-, or oil-burning installation. The warm and moist exhaust air is to be conducted out-side or to a suitable venting duct over the shortest path possible. The vent ducting must be laid so that air flow is not hindered. To achieve this, use as few bends as possible along with short pipelines and well-made connections and transitions checked for air-tightness. No filters or grilles may be fitted in the vent ducting.
The end of the vent ducting leading out into the open should be protected against the ele-ments, e.g., with a downward-facing 90° bend.
During tumble dryer operation, the room must be adequately ventilated.

Room ventilation opening for air intake from the setup room
The minimum dimension of the ventilation opening depends on the cross-section of the vent duct.

Vent duct	Minimum dimension for ventilation opening
	
6″ (150 mm)	–

(177 cm²)

| 82 5/16″²

(531 cm²)

| 10 1/4″

(260 mm)

| 9 1/16″

(230 mm)

–| 6″

(150 mm)

| 34 7/8″²

(225 cm²)

| 104 5/8″²

(675 cm²)

| 11 5/8″

(295 mm)

| 10 1/4″

(260 mm)

7 1/16″ (180 mm)| –| 39 3/8″²

(254 cm²)

| 118 1/8″²

(762 cm²)

| 12 3/8″

(315 mm)

| 11″

(280 mm)

–| 7 1/16″

(180 mm)

| 50 1/4″²

(324 cm²)

| 150 11/16″²

(972 cm²)

| 14″

(355 mm)

| 12 3/8″

(315 mm)

7 7/8″ (200 mm)| –| 48 11/16″²

(314 cm²)

| 146″²

(942 cm²)

| 13 3/4″

(350 mm)

| 12 3/16″

(310 mm)

–| 7 7/8″

(200 mm)

| 62″²

(400 cm²)

| 186″² (1,200 cm²)| 15 9/16″

(395 mm)

| 13 3/4″

(350 mm)

8 11/16″ (220 mm)| –| 58 7/8″²

(380 cm²)

| 176 11/16″²

(1,140 cm²)

| 15″

(381 mm)

| 14 13/16″

(377 mm)

–| 8 11/16″

(220 mm)

| 75″²

(484 cm²)

| 225 1/16″²

(1,452 cm²)

| 16 15/16″

(430 mm)

| 15 1/16″

(382 mm)

9 13/16″ (250 mm)| –| 76 1/8″²

(491 cm²)

| 228 5/16″²

(1,473 cm²)

| 17 1/8″

(435 mm)

| 15 3/16″

(385 mm)

–| 9 13/16″

(250 mm)

| 96 7/8″²

(625 cm²)

| 290 5/8″²

(1,875 cm²)

| 19 5/16″

(490 mm)

| 17 1/8″

(435 mm)

11 3/16″ (300 mm)| –| 109 9/16″²

(707 cm²)

| 328 3/4″²

(2,121 cm²)

| 20 1/2″

(520 mm)

| 18 1/8″

(460 mm)

–| 11 3/16″

(300 mm)

| 139 1/2″²

(900 cm²)

| 418 1/2″²

(2,700 cm²)

| 23 1/4″

(590 mm)

| 20 1/2″

(520 mm)

Exhaust connection

Example 1
Configuring vent ducting made from steel piping for the PDR 914/514 tumble dryers:

L1, L2: each 9′ 10″ (3 m) steel piping
B1, B2: each 90° concertina pipe elbow (r = 2d)
B3: 90° elbow (r = d) $Miele-PDR-922-Commercial-Tumble-Dryers-fig- $3$$

Total duct length

Steel pipe L1 = 9′ 10″ (3.0 m)
Steel pipe L2 = 9′ 10″ (3.0 m)
90° concertina pipe elbow (r = 2d) B1 = 10′ 6″ (3.2 m)*
90° concertina pipe elbow (r = 2d) B2 = 10′ 6″ (3.2 m)*
90° elbow (r = d) B3 = 6′ 3″ (1.9 m*)
Total duct length 46′ 11″ (14.3 m)

Substitute duct lengths according to Table 1

Duct diameter depending on total pipe length
For the calculated total pipe length of 46′ 11″ (14.3 m) for a PDR 914/514, a minimum duct diameter of 6″ (150 mm) is specified for the exhaust ducting according to Table 2.

Example 2
Common combined exhaust ducting for multiple appliances should only be considered as a solution in exceptional cases.

Configuring combined exhaust ducting made from steel for the PDR 914/514 and PDR 918/518 series tumble dryers:

L1–L4 each 6′ 6″ (2 m) steel piping
B1–B3 each 90° concertina pipe elbow (r = 2d)
B4 45° elbow (r = 2d)
B5 90° elbow (r = d)

If the exhaust from multiple appliances is to be ducted into a combined line, a non-return device must be installed in each separate line to prevent backflow.

$Miele-PDR-922-Commercial-Tumble-Dryers-fig- $4$$

Total pipe length PDR 914/514

Steel pipe L1 = 6′ 6″ (2.0 m)
Steel pipe L2 = 6′ 6″ (2.0 m)
Steel pipe L4 = 6′ 6″ (2.0 m)
90° concertina pipe elbow (r = 2d) B1 = 10′ 6″ (3.2 m)*
90° concertina pipe elbow (r = 2d) B2 = 10′ 6″ (3.2 m)*
90° elbow (r = d) B5 = 6′ 3″ (1.9 m*)
Total duct length 14.3 m

Substitute pipe lengths according to Table 1

Pipe diameter depending on total pipe length

Total pipe length = 46′ 11″ (14.3 m)
Maximum permissible total pipe length 62′ 4″ (19 m) = Ø 6″ (150 mm) internal pipe diameter (see Table 2)

Total pipe length PDR 918/518

Steel pipe L3 = 6′ 6″ (2.0 m)
Steel pipe L4 = 6′ 6″ (2.0 m)
90° concertina pipe elbow (r = 2d) B3 = 10′ 6″ (3.2 m)*
45° elbow (r = 2d) B4 = 2′ 3″ (0.7 m)*
90° elbow (r = d) B5 = 6′ 2″ (1.9 m)*
Total duct length 32′ 1 13/16″ (9.8 m)

Substitute pipe lengths according to Table 1

Pipe diameter depending on total pipe length

Total pipe length = 32′ 1 13/16″ (9.8 m) (PDR 918/518)
Maximum permissible total pipe length 49′ 2″ (15 m) = Ø 6″ (150 mm) internal pipe diameter (see Table 2)

Total duct diameter

According to Table 3

Duct diameter PDR 914/514
Ø 6″ (150 mm) = 27 3/8″² (177 cm²)
Duct diameter PDR 918/518
Ø 6″ (150 mm) = 27 3/8″² (177 cm²)
Total cross section A = 54 13/16″² (354 cm²)
Total duct diameter = Ø 8 11/16″ (220 mm)

Example 3
Configuring exhaust ducting and a supply pipe made from steel for the PDR 914/514 series tumble dryer:

L1, L2: each 6′ 6″ (2.0 m) steel piping
L3: 8′ 2″ (2.5 m) steel piping
B1, B2: 90° concertina pipe elbow for each
B3, B4: 90° elbow (r = d) for each

$Miele-PDR-922-Commercial-Tumble-Dryers-fig- $5$$

Total duct length

Steel pipe L1 = 6′ 6″ (2.0 m)
Steel pipe L2 = 6′ 6″ (2.0 m)
Steel pipe L3 = 8’2″ (2.5 m)
90° concertina pipe elbow B1 = 10′ 6″ (3.2 m)*
90° concertina pipe elbow B2 = 10′ 6″ (3.2 m)*
90° elbow (r = d) B3 = 6′ 3″ (1.9 m*)
90° elbow (r = d) B4 = 6′ 3″ (1.9 m*)
Total duct length 54′ 9 1/2″ (16.7 m)

Substitute pipe lengths according to Table 1

Pipe diameter depending on total pipe length
For the calculated total pipe length of 54′ 9″ (16.7 m) for a PDR 914/514, a minimum pipe diameter of 6″ (150 mm) is specified for the exhaust ducting and supply pipe according to Table 2.

Configuring the room ventilation opening
Rooms in which rotary irons and tumble dryers are operated must have an induced ventilation system (e.g., ventilation slots in windows and doors, wall openings with grilles, or opened windows or skylights).

For example 1
A duct diameter of 6″ (150 mm) was specified in example 1. According to this duct diameter, a room ventilation opening with a size of 17′ 5″ (531 cm) is required. The edge length is 9 1/16″ (230 mm) (see Table 3).

For example 2
A total duct diameter of 8 11/16″ (220 mm) was specified. According to this duct diameter, a room ventilation opening with a size of 37′ 4″ (1,140 cm) is required. The edge length is 14 13/16″ (377 mm) (see Table 3).

For example 3
Since in this case the tumble dryer is connected to a central air supply, additional ventilation openings are not needed.

PDR 922/522, heated with steam

Dimensions

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Installation

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Electrical connection
Connection for equipotential bonding
Exhaust duct
Condensate connection
Steam connection
Steam valve connection
Connection for communication module
Connection for communication box
Communication box (optional) For setting up a connection with external systems
Steam valve

Floor anchoring

$Miele-PDR-922-Commercial-Tumble-Dryers-fig- $8$$

Drill hole/anchor point

Technical data

Possible voltage options

208/240 V 60 Hz 2 Ph

Power source
- 208/240 V
- 60 Hz
- 2 Ph
Total amps 7 A
Maximum fuse rating (time-delay fuse) 15 A
Minimum current 8.8 A

Exhaust air

Airflow rate 790 m³/h
Maximum permitted pressure loss 0.04 psi (310 Pa)
Maximum exhaust air temperature 175°F (80°C)
Maximum evaporation rate 45.6 lb/h (20.7 kg/h)
Exhaust air connector on machine side 6″ (DN 150)

As relative humidity inside the exhaust ducting can be as high as 100%, suitable measures must be taken to prevent a backflow of condensate into the machine.

Supply air

Standard connection: air intake from installation site

Recommended free air intake cross-section into the room: (equivalent to 3 times the exhaust air cross-section of a machine).

146 sq. in. (942 cm²)

There must be sufficient air intake to the installation site to match the air outlet volume.

Alternative connection: air intake connection directly from outdoors

Connection sleeve on machine side (internal diameter) 6 5/16″ (161 mm)
Connection pipe provided on site (external diameter) 6 5/16″ (160 mm)

Removing the protective cover exposes live parts. For safety reasons, a pipe must be installed from the tumble dryer’s central fresh air intake (over a minimum length of 35 7/16″ (900 mm)) and secured with 2 screws.

Steam connection

Design pressure on high-pressure side 87–145 psi (0.6–1 MPa)
Boiling point 329-363°F (165–184°C)
Mass flow, peak capacity 28 kW
On-site threaded union for steam (internal thread) ½”
Length of steam valve connection cable 19 11/16″ (500 mm)

Steam valve, dirt filter, and steam shut-off valve must be installed by the customer on site. The steam valve must be installed in the direct vicinity of the steam connection.

Condensate connection