IMPORTANT
To determine if a heater is single voltage (115VAC – manufactured before 4/27/04) or dual voltage (120/240VAC –
manufactured on or after 4/27/04), shut off power to the heater, remove the heater covers and open the control box.
DDDDuuuuaaaallll VVVVoooollllttttaaaaggggeeee CCCCoooonnnnttttrrrroooollll BBBBooooxxxx.... Note 12-Pin Plug at left
rear of box. Dual voltage units (120/ 240VAC)
have been manufactured since April 27, 2004.
SSSSiiiinnnngggglllleeee VVVVoooollllttttaaaaggggeeee CCCCoooonnnnttttrrrroooollll BBBBooooxxxx.... Single voltage
units (120VAC only) were manufactured prior
to April 27, 2004.
12-Pin Plug
See Pages 4-32 and 4-33 for Wiring Connection Diagrams.
See Page 7-1 for more information.