Bacharach HGM-SZ Supplementary Manual

NEW STYLE HGMSZ TECHNICAL SUPPORT NOTES 

FOR ALL SERIAL NUMBER STARTING WITH NU XXX AND ABOVE (JULY 2008) 

<4000> Zero Fault – IR Voltage out of tolerance 

<4200> Zero Fault and Gain set Fault 

<8000> Clipping Fault – Detector voltage out of tolerance 

For both Zero Fault and Clipping Fault – Press the UP arrow key to locate the screen displaying 

the following- 

SILENCE ZONE 

TMP 

SQUELCH CAL 

Place curser on CAL – press right arrow key and ENTER at the same time. 

The new screen will show the revision number. Note the revision number. Press the 

SILENCE/QUIT key: the next screen will display the following –  

DIGIPOT MODEL 

P CAL  

IR 

Place the curser on DIGIPOT – Press the ENTER key. The following screen will appear – 

NOTE – To verify correct model number, put curser on model and press enter. Standard 

refrigerant – 3015-4200, ammonia – 3015-4280. 

DIGIPOT = XXX 

IR VOLT = X.XXX 

Adjust the IR reading using the up and down arrow until the IR VOLT = 4.245 volts or as close 

as you can get it to that reading. Press SILENCE/QUIT key until you return to the screen reading 

PURGE. 

NOTE – The fault may not clear if the Digipot voltage is more then 0.15 volts away from 4.2 

volts. 

Revised 6/5/08 

P. M. Pape