18 YEL/GRN - HEB+
OPEN
18 YEL/RED - HST+
OPEN

O/H

LABEL
CHASSIS
SIDE
OF LOOP

4

HYD HEAT (250D)

FRT LOGO
SEALED
16 GRN/RED - EAL
16 WHT - CG1

PWR DR LCK
BLUNT
14 GRN - DLK
14 BLU - DULK

2

18 RED - PS+
18 BLK - PS18 BLU - CAN_L
18 WHT - CAN_H

7
4

3

3

4

STEP MAG
BLUNT
16 BRN/WHT - ESD
16 WHT - SC1

1

18/2 RR SPKR
BLUNT
18 VLT/BLK - RR18 VLT - RR+

4

172165-1
14 RED/BLK - IGN
18 WHT - CG1

18 WHT - CA

3
2

4

4

LOGO
BLUNT
16 BLK - PLT
16 WHT - CG1

TV LOCK OUT

1

32006-D22 (BLU)

1

14 RED - RAI
14 RED - PUSB
14 RED - PP1
10 ORG - HTR2
14 RED - DUSB

T

18"

2
ALARM HORN

BATT(IGN/ACC-C3)

18"

BATT (CHAS/ING-C2)

2

32006-B22 (GRY)
BATT (CHAS-C1)

10 RED - FCSP
16 WHT - CG1
16 YEL/BLK - FCSS
10 RED/BLK - LFT
BLANK

16 ORG - PLTCH
16 WHT - CG1
16 YEL/BLK - FCSS
16 RED - FAL
16 RED - IGN1

TOLERANCES ON MACHINED PARTS.
INCHES
.XX ` .05
.XXX ` .03
MODEL(S):

14 YEL - PDL
18 BRN/WHT - KEH
16 RED - IGN1
16 RED - HRL
BLANK

DRAWN:

R.DYE

ALL OTHER PARTS AND MATERIAL:
ASSEMBLY TOLERANCES GXL or Equiv.
.X .3mm
SHOULD BE HELD AS
APPLICATION:
.XX 10mm
CLOSE AS POSSIBLE.

METRIC

BERKSHIRE XL

Electrical

FLOORPLAN(S):

37A, ----, ----,

6"
IGN SLND
2-34161-1
14 RED - KEY

32006-A22 (BLK)

6"

D

14 BLU - PSC
14 ORG - BUL
16 BLU - BU
12 ORG - PPS
18 WHT - CG1
14 YEL - MEM
10 RED - FCSP
14 RED - IGN1

IGN SLND
2-34161-1
14 WHT - CG1

12 RED - LSP
10 YEL - HTR1
14 RED/BLU - AMP
16 BLU - CU/MP
10 RED - ESP
18 YEL - MST
-

DATE

7/20/20
PRINT LOCATION:

SYSTEMS
DO NOT SCALE DRAWING

TITLE

HRN, CHASSIS , FRT.11X17

USAGE OF THE INFOMATION
DWG/PRINT NUMBER:
CONTAINED ON THIS DOCUMENT IS
0610-500478.dwg
CONTINGENT ON AGREEMENT TO THE
CONDITIONS STATED ON PAGE 1.

REV:

D

SHEETS:

3 /6

Evans Tempcon, Inc.

Recreational Vehicle
FRONT OCCUPANTS’ HVAC
Service Manual
(All Electric Control Systems)

EVANS TEMPCON, INC.
701 ANN ST. NW
GRAND RAPIDS, MI 49504
(616) 361-2681
WWW.EVANSTEMPCON.COM
1

Table of Contents
Pages
1. Service

• Contact Information
• Request For Technical Support, Questionnaire
• Comments

5
6
7

2. Electrical / Electronic Systems
•
•
•
•

Control Modules
Electrical Schematics
Diagnostic Guide
Expected Voltages - Matrix

8
9
11
14

3. Air Flow Systems
• Blower Motor Assemblies
• Air Distribution Systems

15
16

4. Heating System
• Engine Coolant System
• Diagnostic Guide
• Hot Water Valve Diagnostic Guide

24
26
27

5. Air Conditioning System

• Diagnostic Guide
• A/C System Operation Check
• Expected A/C Performance
• Recommended Refrigerant Charge Chart
• Compressor Function Test
• Thermostatic Expansion Valve (TXV) Function Test
• Refrigerant Charge Information
• Service Tips

33
35
36
37
38
39
40
41

Notes (Not applicable for hard copies):
1. Phrases in the color blue are “Hyperlinks” that allow you to jump directly to the
section mentioned. Press the “Ctrl” key and click your left mouse button to
activate.
Example : “Table Of Contents”
2. The Section Titles are “Hyperlinks” that allow you to jump to the “Table Of
Contents”.
2

Table of Contents (Continued)
Pages
6. Air Conditioning Theory

• The Four Major Functions Of An A/C System
• A/C System Basic Operation
• Heat Measurement
• Types Of Heat
• Understanding Heat Transfer
• The Added Value Of Latent Heat
• Heat Transfer Diagram
• Temperature/Pressure Relationship
• Typical A/C Operating Condition
• Air Conditioning System
• Super Heat
• R134 Temperature / Pressure Chart
• Sub Cooling

42
43
44
44
45
47
48
49
50
51
52
53
54

7. Air Conditioning System Components

• Refrigerant System Scheme
• Compressor, Pulley, Clutch and Oil
• Evaporators
• Thermostatic Expansion Valves (TXV)
• Evaporator Thermostatic Switch
• Condensers, Foam Seals and Electric Fan
• Receiver / Driers
• Refrigerant Pressure Switches
• Refrigerant Hose and O-Rings

55
56
61
62
63
64
66
67
68

8. Dash Heater / Air Conditioner Owner’s Manual






Dash Heater / Air Conditioner
Control Panel Operation
Air Distribution - Mode Control
Operating Features
Evans All Electric Control Panels

3

72
73
73
76

Service
Disclaimer:
WARNING!!
The technical information, provided in this service guide, is intended for use by
properly trained HVAC service personnel, whom can ensure a safe and properly
operating system. It is assumed that the user of this guide is trained and
experienced in basic refrigeration principles, in addition to being familiar with
Evans Tempcon HVAC hardware installed on Recreational Vehicles. The
technician must also be certified in accordance with the Environmental
Protection Agencies Clean Air Act.
Before any air conditioning service is started, it is the technician's responsibility
to determine what type of refrigerant is contained in the system. Component
marking and/or service port peculiarities are good places to start in an effort to
identify the contents.
Evans Tempcon advises that the usual precautions associated, with servicing a
motor vehicle, be exercised when servicing the HVAC system and assumes no
liability with regard to vehicle damage or personal injury. Additionally, Federal
and any Local regulations regarding the handling and use of refrigerants should
be complied with at all times.

NOTES:
TECHNICAL SUPPORT IS PROVIDED TO CERTIFIED TECHNICIANS ONLY.
EVANS DOESN’T SUPPLY TECHNICAL SUPPORT TO RV OWNERS.
THE AIR CONDITIONING SYSTEM CONTAINS REFRIGERANT R134A, UNDER
HIGH PRESSURE, AND SHOULD BE SERVICED BY ONLY QUALIFIED
PERSONNEL.
REPAIRS THAT ALTER THE DESIGN OF THE EVANS SYSTEM, INCLUDING USE
OF NON-EVANS SUPPLIED PARTS, WILL VOID THE WARRANTY AND ANY
EVANS LIABILITY FOR THE HVAC SYSTEM.
THE EVANS HVAC SYSTEM SHOULD BE SERVICED BY A FULLY TRAINED AND
ENVIRONMENTALLY LICENSED TECHNICIAN. FAILURE TO AGREE TO ALL
STATEMENTS COULD RESULT IN SERIOUS INJURIES, FINES AND POSSIBLE
VOIDING OF ANY WARRANTIES.

4

Service
Contact Information
Address:
701 Ann Street NW
Grand Rapids, MI 49504
United States
Phone Numbers:
616-361-2681 - Phone
616-361-9646 - Fax
E-Mail Address: [email protected]
Web Site: www.evanstempcon.com

5

Service
REQUEST FOR TECHNICAL SUPPORT QUESTIONNAIRE
Open the front service door of the coach and verify if you are servicing an Evans
HVAC system by checking the base unit mounted on the front firewall. Verify
customer complaint by operating the vehicle. (Print this page for reference).
DESCRIPTION OF COMPLAINT:

DEALER:
CONTACT/TECH:

PHONE #:

CHASSIS: ______________________MODEL YR:

MODEL:

COACH MANUFACTURER:
CONDENSER TYPE & LOCATION
PRESSURE GAUGE READINGS:
LOW

PSIG @ 1500 RPM, HIGH BLOWER SPEED

HIGH

PSIG @ 1500 RPM, HIGH BLOWER SPEED

R134A REFRIGERANT CHARGE WEIGHT:_____________ POUNDS
AIR TEMPERATURE & HUMIDITY READINGS:
HUMIDITY LEVEL: _____ %RH
RECIRCULATION INLET AIR TEMPERATURE: ______________⁰F
DISCHARGE AIR TEMPERATURE (VENT CLOSEST TO BASE UNIT): ___________ ⁰F
SUBTRACT THE TWO AIR TEMPERATURES = ______________⁰F DIFFERENTIAL
NOTES:

6

Comments:

7

Electrical/Electronic System
Control Modules
Plastic Injection Molded Design
Evans’ Part Number: RV012631

Front Side

Back Side

Metal Horizontal Design
Evans’ Part Number: RV202036 & RV202040

Front Side

Back Side

Metal Vertical Design
Evans’ Part Number: RV202038

Front Side

Back Side

8

Electrical/Electronic System
Electrical Schematics
Plastic Control Panel - Harness PN: RV012632, RV012633, RV012634, and RV012703

9

Electrical/Electronic System
Electrical Schematics (Continued)
Metal Control Panel - Harness PN: RV012672 or RV012673

10

Electrical/Electronic System
Diagnostics Guide
(Reference the appropriate electrical schematic first and follow “POSSIBLE
CAUSES” in sequence)
PROBLEM
1. Control panel is
not functional.

POSSIBLE CAUSES
REMEDY
 Vehicle ignition switch isn’t  Activate vehicle ignition switch.
activated.
 Loss of power supply.

 Examine the chassis’s HVAC circuit’s
protection device for failure (i.e. fuse or
circuit breaker). Two power sources are
required.

 Open circuit between
 Check primary connections at power
vehicle ignition and control
source, ground source and the control
panel. Open circuit
panel Verify vehicle voltage at each
between ground source
connection. Perform continuity test
and control panel.
between each connection. Repair or
replace harness if necessary.