Remove/install heater unit

AR83.70-P-5302NA

Remove/install heater unit

23.07.2019

Model

170.444/449 1# with transmission 716.6

Retrofitted stationary heater Thermo Top C

3

Coolant outlet hose, heater

7

Fuel line

12a

Water separator

4

Coolant feed hose, heater

9

Coupling, power supply

14

Exhaust line

6

Screw

10

Coupling, control lines

A6

Stationary heater unit

6a

Spacer

11a

Threaded holeM6

A6m1

Coolant recirculation pump

6b

Screw M6x25 mm

12

Combustion air intake hose

 

Remove/install

Notes on repairing the stationary heater

AH83.70-P-0001-03D

 Warning

Risk of injury to skin and eyes suffering scalding from contact with hot coolantspray. Risk of poisoning from swallowing coolant.

Do not open cooling system unless coolant temperature is below 90 °C. Open cap slowly and release the pressure. Do not pour coolant into beverage containers.
Wear protective gloves, protective clothing and safety glasses.

AS20.00-Z-0001-01A

1

Release pressure in coolant circuit

 To do so, turn cap of coolant expansion reservoir to detent position 1.

2

Clamp off coolant feed and coolant outlet hose (4, 3)

 Clamp

*000589543700

3

Disconnect coolant hoses (4, 3) from heater (A6) and coolant circulation pump (A6m1)

 Collect escaping coolant in a clean vessel and, after installation, pour back into coolant expansion reservoir.

4

Disconnect water separator (12a) with rubberized pipe clamp (see arrow) from heater (A6)

 Remove water separator from combustion air intake line (12).

5

Disconnect fuel line (7) from heater (A6)

 Collect escaping fuel.

6

Disconnect exhaust gas line (14) from heater (A6)

7

Loosen screws (6, 6b) from heater (A6)

 Pull spacer (6a) off screw (6b) M6x25 mm.

 Model 170.444/449Bolt, bracket to heater

*BA83.70-P-1009-01A

8

Guide heater (A6) out in upward direction and, when doing so, detach couplings (9, 10) of electrical connection lines

 

Disassemble/assemble

9

Disconnect coolant circulation pump (A6m1) from heater (A6)

AR83.70-P-5700F

 Installation: Attach cover with straight inlet fitting to coolant pump.

10

Make M6 thread in left upper bore (11a)

 Do not make thread for screw (6b) over entire length of bore.

11

Pre-screw remaining bores (see arrows) with screws (6, EJOT PT)

12

Install in the reverse order

13

Bleed coolant circuit after installation of heater

AR83.70-P-5302-01E

Check

14

Check fuse assignment



Fuse assignment of fuse and relay box in right engine compartment

GF54.15-P-1256-02AA

 Danger

Risk of explosion caused by fuel vapors igniting, risk of poisoning caused by inhaling combustible gases and risk of injury caused by burns during and after operation of heater unit

Do not operate stationary heater, auxiliary heater or engine with heater booster in closed rooms or when refueling. Allow heater unit to cool down after operation and wear protective gloves.

AS83.70-Z-0002-01A

15

Commission stationary heater



Start up stationary heater

AZ83.70-P-0008-04A

 If the heater (A6) switches off automatically before reaching its operating temperature and cannot be restarted,

a fault interlock exists:



Override malfunction interlock

AR83.70-P-5302-07CA

16

Check cooling system for leaktightness

AR20.00-P-1010HA

 Stationary heater

Number

Designation

MODEL 170, 202, 208, 210 with Thermo Top C heater

BA83.70-P-1009-01A

Bolt, bracket to heater

Nm

10