Levenhagen, John I. <br/><br/>
HVAC controls and systems / 
John I. Levenhagen, Donald H. Spethmann. 
 - New York :  McGraw-Hill Book,  1993. 
 - 334 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>0070375097  RM129.85 
<br/><br/><label>LCCN: </label>92-25594 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Heating--Control.<br/>Air conditioning--Control.