This SAE Recommended Practice establishes uniform cold weather test procedures and performance requirements for engine coolant type heating systems of bus that are all vehicles designed to transport 10 or more passengers. The intent is to provide a test that will ensure acceptable comfort for bus occupants. It is limited to a test that can be conducted on uniform test equipment in commercially available laboratory facilities. Required test equipment, facilities, and definitions are included.
There are two options for producing hot coolant in this recommended practice. Testing using these two approaches on the same vehicle will not necessarily provide identical results. Many vehicle models are offered with optional engines, and each engine has varying coolant temperatures and flow rates. If the test is being conducted to compare the performance of one heater design to another heater design, then the external coolant source approach (Test A) will yield the most comparable results. If the test is being conducted to validate the heater installation on a specific vehicle model with a specific engine, then using the engine to heat the coolant (Test B) will be more appropriate.
Defrosting and defogging procedures and requirements are established by SAE J381 which is hereby included by reference.
This document will be reviewed and revised as required with advancements in technology and changes in environmental laws.
The current SAE J2233 test procedure provides two separate means of heating the coolant during testing, but these two approaches can provide very different results. If the engine is used to heat the coolant, the engine rpm and engine load criteria are neither clear nor consistent.
There are two distinct reasons to test a heating system:
To compare two or more alternative heating systems during the design process.
To compare the heater(s) performance of a specific vehicle and engine configuration to an established standard.
This revision recognizes these differences in the reasons for testing, and provides specific test conditions depending on the test intent.
The changes in this revision are made bring this standard to be in compliance for recently updated SAE J381 and SAE J1612 test procedures and performance requirements as well as Mid-Size Bus Heating System Performance Test procedure. Updated the test report template to match the procedure.