Schwank duraSchwank - Steel STW-JZ - Manual (Page 50)

50
SPW-JZ, STW-JZ / IWP, IW
I&O Manual IM101229
RL: 12B- BA
RD: AUG 2013
When this appliance is installed above the altitude stipulated below, the input must be de-rated
by 4% for each 1000 ft . If your local utility supplies gas with a de-rated heat content, no
orifice change is required in the heater . Check with your local utility regarding de-rating.
USA: The factory installed orifice for this appliance is approved for altitudes zero to
2000 feet above sea level. Above 2000 feet, refer to table below.
Canada: The factory installed orifice for this appliance is approved for altitudes zero to
4500 feet above sea level. When installed above 4500 feet, refer to the table below.
~ ORIFICE TABLE ON NEXT PAGE ~
28. HIGH ALTITUDE INSTALLATION