EngA ENGINEERED AIR DJM2.4, Инструкция по установке, эксплуатации и обслуживанию, Страница: 5 / 37

DJM2.4 MANUAL
5 Oct 00 R2
MODEL DJM2.4
NOTE: In this manual references to DJM, DJM2 or DJM2.x refer to the model DJM2 in this
manual. The DJM2 differs from the original DJM with the addition of status lights and
the ability to control the “high turndown burner”. The DJM2 also has an optically
isolated 0-10 VDC input to accept a modulating heat signal from such devices such as
the Engineered Air C-TRAC. In addition to original TS144/TD114 Maxitrol control, it can
also accept a Johnson TE 6000 discharge air sensor that can be switched to service mode
for easy burner/combustion set-up.
TEMPERATURE CONVERSIONS
In this manual temperatures are listed in both degrees C (°C) and degrees F (°F). The conversion
formulas between the two systems are as follows:
°F = (°C X 1.8) + 32
°C = (°F - 32) x 0.56
I. APPLICATION
The DJM2 is backward compatible to the original DJM. It can be operated in the following
applications, which may not be suitable for the DJM3:

The DJM2 can be totally controlled by the C-TRAC, METASYS or BMS.

The DJM2 has no built-in low limit therefore it can be applied as “stairwell pressurisation in
case of fire”.

The DJM2 is designed to replace the original DJM and has additional features to assist in
troubleshooting.
II. SERVICE
To ensure warranty coverage and safe operation this equipment should only be serviced by
qualified HVAC Technicians, Gas Fitter and other properly trained trades people. Before servicing
this product, the service technician should be familiar with the following points in this guide:
Some DJM2's may have an override or a second control source connected to them. Refer to the
wiring diagram to determine if more than one control source is wired to your DJM2's application. If
a second control is connected refer to the sections titled "
Temperature Control " (Section XI) ,
" Proportional/Integral Setting " (Section VII) , or " High Fire Override " (Section VIII) for more
information.
Do not adjust pots unless you are familiar with operation, effect, and how to return to correct
setting. This needs special equipment in some cases. Just noting where settings are will not allow
return to the correct point on some sensitive pots.
Refer to the " Burner Set Up " (Page 16) to adjust combustion.