1. Setup/Installation/Operation of an Environmental Control Unit (ECU)
U-09F01

2. Overview
Characteristics
Set-Up and Installation
Operations

4. Characteristics of the ECU
Design Features
The ECU is a package system designed to operate in a portable field capacity
Ducting
Built-in
Control box
Remote controller

5. Characteristics of the ECU
Specifications of the ¾ Ton ECU (B0074)
Provides 9,000 BTU cooling capacity
Provides 3,400 BTU heating capacity
The ECU operates using 120VAC, 1 Phase, 50/60Hz power
Dimensions are 16.00” High, 23.75” Wide, 26.67” Deep and weighs 187 pounds
Refrigerant Charge: 1 lbs 14 oz of R-22

6. Characteristics of the ECU
Specifications of the 1.5 Ton ECU (B0003)
Provides 18,000 BTU cooling capacity
Provides 7,000 or 14,000 BTU heating capacity
The ECU operates using 208VAC, 3 Phase, 50/60Hz power
Refrigerant Charge: 3 lbs 2 oz of R-22
Manufacturer- Nordic Air, INC., Geneva, Ohio

7. Characteristics of the ECU
Specifications of the 3 Ton ECU (B0014)
Provides 36,000 BTU cooling capacity
Provides 31,000 BTU heating capacity
The ECU operates using 208VAC, 3 Phase, 50/60Hz power
Refrigerant Charge: 5 lbs 9 oz of R-22
Manufacturer- Nordic Air, INC., Geneva, Ohio

8. Characteristics of the ECU
Specifications of the 5 Ton ECU (B0008)
Provides 60,000 BTU cooling capacity
Provides 37,000 BTU heating capacity
The ECU operates using 208VAC, 3 Phase, 50/60Hz power
Refrigerant Charge: 9 lbs 8 oz of R-22
Manufacturer- Nordic Air, INC., Geneva, Ohio

9. Characteristics of the ECU
Specifications of the Integrated Trailer-ECU-Generator (ITEG) (B0018)
The Integrated Trailer-ECU-Generator (ITEG) is an integrated HMMWV towable
ECU generator combo

10. Characteristics of the ECU
Specifications of the 10 Ton ECU (B0010)
Provides 120,000 BTU cooling capacity
Provides 47,000 BTU heating capacity
The ECU operates using 208VAC, 3 Phase, 50/60Hz power supplied by the generator
Refrigerant Charge: 10 lbs of R-22
Manufacturer- Nordic Air, INC., Geneva, Ohio

11. Characteristics of the ECU
Specifications of the Generator
Provides 22kW of electrical power
The generator is equipped with 208VAC, 3 Phase, 60Hz, 60A power supply system and two 120V, 3 phase, 15A utility outputs

12. Characteristics of the ECU
Electrical Components
Circuit Breakers
The ECUs is wired with two circuit breakers, main and control breakers, that are opened when it’s rated current flow is exceeded

13. Characteristics of the ECU
Electrical Components
Phase Monitor
This component ensures that all three phases of power are entering in the correct order and uninterrupted

14. Characteristics of the ECU
Electrical Components
Selector Switch 1
Used to select the operating mode needed for current conditions

15. Characteristics of the ECU
Electrical Components
Selector Switch 2
The remote gives the user the capability to control the desired temperature from within the confined space

16. Characteristics of the ECU
Electrical Components
Thermostat
A control device that responds to the surrounding air temperatures of the confined space

17. Characteristics of the ECU
Electrical Components
Condenser Fan Cycling Switch
Cycles the condenser motor to low speed to allow for low ambient temperature operation

18. Characteristics of the ECU
Electrical Components
Time Delay Relay 1
Prevents compressor from short cycling
Compressor will not turn back on for two minutes

19. Characteristics of the ECU
Electrical Components
Time Delay Relay 2
Allows the ECU to start and pressurize in low ambient conditions

20. Characteristics of the ECU
Electrical Components
Fan Motors
Are used to rotate the evaporator and condenser fans blades at the specified RPM

21. Characteristics of the ECU
Electrical Components
Main Heating Elements
When electrical current is fed into the heating elements it meets resistance and heat is created

22. Characteristics of the ECU
Mechanical Components
Compressor
The type of compressor used in the ECUs is a scroll type compressor

23. Characteristics of the ECU
Mechanical Components
Discharge Service Port
Used to add or remove refrigerant

24. Characteristics of the ECU
Mechanical Components
Condenser Coil
Turns high pressure, high temperature vapor into a high pressure high

25. Characteristics of the ECU
Filter Drier
Filters the impurities and absorbs moisture from liquid refrigerant.
Sight Glass
Used to monitor the refrigerant charge.
Thermal Expansion Valve
Serves two purposes, it separates the high side from the low side and it also meters the flow of refrigerant to the evaporator.

26. Characteristics of the ECU
Mechanical Components
Evaporator
Turns low temperature, low pressure liquid refrigerant into low pressure, low temperature super heated vapor

27. Characteristics of the ECU
Protection Features
High Pressure Cutout Switch
Opens the circuit to the compressor relay if the pressure rises above a predetermined threshold

28. Characteristics of the ECU
Protection Features
Low Pressure Cutout Switch
Opens the circuit to the compressor relay if the pressure falls below a predetermined threshold

29. Characteristics of the ECU
Pressure Relief Valve
Will discharge refrigerant if the internal pressures rises above a certain threshold
Heater Safety System
Two high limit trip switches set to break if electric heater compartment temperature rises above 140°F

31. Set-up and Installation of the ECU
Unit Setup
The ECU should be set in a level location, not be on an incline greater than 10° in any direction
The ECU is should be set in a location relative to the shelter to allow the ducts to lay straight
UNCLASSIFIED

32. Set-up and Installation of the ECU
Gear
Be sure to remove all gear stowed in the storage compartment that is located in the condenser section
The storage compartment is designed to accommodate
Two 10’ flexible ducts (16” compressed)
Remote with 50’ cord
Technical Manual
50’ Power Cord
Replace and secure storage compartment cover

33. Set-up and Installation of the ECU
Duct Installation
Remove and roll up canvas covers
Loosen straps and expand flexible duct
Attach one end of the duct to the ECU
Route the free end of the duct to the shelter

34. Set-up and Installation of the ECU
Cable Installation
First, attach the power cable to the ECU
Then route the other end to the 208VAC 50/60Hz power source and attach it according to the color code in the wiring diagram
Attach the remote to the ECU and route it into the shelter

35. Set-up and Installation of the ECU
Other Preparations
Be sure that the condensate drain is free of restrictions
Remove the protective canvass covers that are located over the evaporator and condenser coils and condenser fan discharge

37. Operating the ECU Three operating modes
Fan
Cool
Heat
The thermostat controls the operation of the unit
This controls the cooling process of the ECU

38. Operating the ECU Operating Modes Fan Cool Heat EVAPORATOR FAN STARTS

39. Operating the ECU Thermostat Bypass
The bypass circuit allows the unit to run continuously even after the thermostat set point has been reached

40. Operating the ECU Starting the Unit
Before connecting any power source do a 360°
Connect the external power supply to power receptacle
Place the circuit breakers in the ON position
Select the operating mode
Fan
Cool
Heat
Adjust thermostat to desired setting

41. Operating the ECU Shutdown Procedures Emergency Shutdown Procedures
Place the Selector Switch in the OFF position
Ensure the fan and compressor stop
Emergency Shutdown Procedures
Place the main circuit breaker in the OFF position
Disconnect the power cord from the main power source to interrupt incoming power
Disconnect the power from the ECU

43. Summary
Characteristics
Set-Up and Installation
Operations

44. Setup/Installation/Operation of an Environmental Control Unit (ECU)
U-09F01