AirComm Corporation Cessna Citation 550 560 Maintenance Manual
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Products, Inc.
Maintenance Manual
21-50-04
April 25/07
Page 1005
FIG. ITEM
PART
NUMBER
NOMENCLATURE
EFFECT
UNITS
PER
ASSY
2 1
2
3
4
5
6
7
20
21
22
23
24
25
26
27
82-02-119-4
81-33-411-3
88-00-431-4
82-02-402-7
82-02-402-8
82-02-402-1
JBS2030-2
JBS2034-1
JBS238-2
JBS237-1
JBS240-1
ES61060-2
ES73100-1
JBS12002-5
ES26104-1
FWD Evaporator
Installation (Cool Stick)
Y Assy
Drain Assy
Cover Plate
Mounting Bracket
Panel Assy
Evap Assy
Shroud Assy
Shroud Air Inlet
Blower Housing
Resistor Assy
Motor Assy
Blower Wheel
Coil Assy
Expansion Valve
RF
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Air Conditioning System -FWD Evaporator (Cool Stick Option)
IPL FIGURE 2
Products, Inc.
Maintenance Manual
21-50-04
May 15/95
Page 1006
FIG. ITEM
PART
NUMBER
NOMENCLATURE
EFFECT
UNITS
PER
ASSY
2 28
8
9
10
11
12
13
14
15
16
ES49011-2
AN960-10L
AN315-3
ES30043-2
NAS221-10
AN960-10
ES70009-2
ES70009-3
ES06022-1
ES48012-2
O-ring
Washer
Nut
Hose Clamp
Screw
Washer
Flex Duct
Flex Duct
Insulation Tape
Drain Tube
1
2
2
2
6
13
12 in
180 in
1700 in
24 in
Air Conditioning System -FWD Evaporator (Cool Stick Option)
IPL FIGURE 2
Products, Inc.
Maintenance Manual
21-50-05
May 15/95
Page 1
AFT EVAPORATOR ASSEMBLY
DESCRIPTION AND OPERATION
1. GENERAL
The aft evaporator assembly is located in the aft cabin at the spar cap (at floor level)
within the aircraft interior. It consists of an evaporator, expansion valve and blower
assembly. The blower supplies conditioned air to the cabin. The evaporator coil
cools and dehumidifies the air to be distributed by the blower.
This section of the maintenance manual discusses troubleshooting used for the aft
evaporator assembly portion of the air conditioning system. An Illustrated Parts List
is included in Figure 1.
Products, Inc.
Maintenance Manual
21-50-05
May 15/95 Page 101
TROUBLESHOOTING
1. GENERAL
The following procedure is used for troubleshooting the aft evaporator assembly.
For additional troubleshooting procedures involving the electrical aspects of the
evaporator blower, see 21-50-01, page 101.
2. TOOLS AND EQUIPMENT
Designation
Ref. No.
Qty
Remarks
Service Pressure Gauge
Comm. Avail.
1
None
28vdc Source
A/R
None
3. EVAPORATOR TROUBLESHOOTING PROCEDURE (Ref. IPL Fig. 1)
A. Water is Being Blown from Air Outlets.
1. Operate GPU and apply 28 vdc electrical power.
2. Select air conditioning system to ON.
3. Check evaporator drain for condensate runoff.
4. If no runoff, clear drain of blockage or verify that routing is in a down hill
orientation.
5. Select air conditioning OFF, remove electrical power.
B. No Cooling at Evaporator.
1. Connect service pressure gauge to service ports located near
compressor/condenser assembly.
2. Operate GPU and apply 28 vdc electrical power.
3. Select air conditioning system to ON.
4. Check evaporator for proper cooling. If cooling not sufficient, check
refrigerant level to ensure that system is correctly charged, this can be
confirmed by a clear sight glass (no bubbles) on the top of the receiver
dryer. If bubbles are present, add refrigerant till sight glass just clears.
5. If system is correctly charged, replace expansion valve per Maintenance
Practices procedure.
Products, Inc.
Maintenance Manual
21-50-05
May 15/95 Page 201
MAINTENANCE PRACTICES
1. GENERAL
The following procedures are used to perform typical maintenance on the aft
evaporator assembly.
2. TOOLS AND EQUIPMENT
Designation
Ref. No.
Qty
Remarks
Sealant
ES49000-1
A/R
None
Polyol Ester Oil
Comm. Avail.
A/R
Viscosity Grade 68
Vacuum Cleaner
Comm. Avail.
1
None
Coil Cleaner
Comm. Avail.
A/R
Non-acid based
3. EVAPORATOR MAINTENANCE PROCEDURES (REF. IPL Fig. 1)
A. Expansion Valve Replacement
1. Discharge system in accordance with recovery equipments instructions.
2. Disconnect liquid line from inlet of expansion valve, and cap. Remove the
thermal sense bulb from its clamp located on the suction tube of the
evaporator and carefully remove insulation covering bulb.
3. Disconnect the fitting that connects the valve to the coil and plug coil fitting.
4. Install new expansion valve and o-ring in the reverse order.
5. Lubricate o-ring with polyol ester oil or apply sealant to fitting mating
surfaces prior to assembly.
6. Install the thermal sense bulb such that it makes contact with the suction
tube along its entire length. Insulate the bulb thoroughly with insulation.
B. Evaporator Coil Cleaning Procedure
1. Use vacuum cleaner to remove large debris from upstream and
downstream coil faces.
2. Spray coil cleaner on both coil faces. Wash off with water.
3. Allow coil to dry thoroughly prior to additional maintenance.
Products, Inc.
Maintenance Manual
21-50-05
May 15/95 Page 1001
Figure 1. Aft Evaporator Assembly
Products, Inc.
Maintenance Manual
21-50-05
April 25/07
Page 1002
FIG. ITEM
PART
NUMBER
NOMENCLATURE
EFFECT
UNITS
PER
ASSY
1 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
82-02-103-2
82-02-403-3
82-02-441-2
88-00-490-2
MS20365-1032
AN960-10L
82-02-403-7
JBS2048-3
JBS240-2
ES73100-2
JBS12002-5
JBS239-2
JBS237-1
JBS238-1
ES61060-2
ES41062-2
AFT Evaporator
Installation
Cover Plate
Louver
Screen
Nut
Washer
Bracket
Evap Assy
Resistor Assy
Blower Wheel
Coil Assy
Shroud Assy
Blower Housing
Shroud Air Inlet
Motor Assy
90° adapter
RF
1
1
1
4
12
1
1
1
1
1
1
1
1
1
1
Air Conditioning System - AFT Evaporator Assembly
IPL FIGURE 1
Products, Inc.
Maintenance Manual
21-50-05
May 15/95 Page 1003
FIG. ITEM
PART
NUMBER
NOMENCLATURE
EFFECT
UNITS
PER
ASSY
1 17
18
ES49011-2
ES26104-1
O-ring
Expansion Valve
1
1
Air Conditioning System - AFT Evaporator Assembly
IPL FIGURE 1