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28 HIGH ALTITUDE INSTALLATION -
Altitude Restrictions this Model: - also see notes previous page
1. Do not install at altitudes greater than 8,000 ft
2. Restrict the length of any model to the shortest tube length at altitudes greater than 4,000 ft
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,
and the following specifically for country of installation:
USA: The factory installed orifice for this appliance is approved for altitudes zero to 2000 feet
above sea level. Installation beyond 2000': Please refer to ANSI Z223.1 National Fuel Gas
Code, which requires to de-rate 4% per 1000' above sea level.
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 Local Provincial Authority
having jurisdiction .
SCHWANK/INFRASAVE RECOMMENDED ORIFICE CHART - ALTITUDE CONVERSION
SPW2 / IWP2
STW2 / IW2
MODEL
80/60 NG
80/60 Propane
110/75 NG
110/75 Propane
130/90 NG
130/90 Propane
155/110 NG
155/110 Propane
175/125 NG
200/140 NG
SPW2, STW2(S) / IWP2, IW2(S) I&O Manual
IM170629
RL: 03C
RD: APR 2019
FOR USE AT ALTITUDES GREATER THAN (FEET)
USA Only
Supplied
0 - 2000
> 2000
# 17
#19
JS-0717-DM
JS-0719-DM
JS-0719-DM
# 38
# 40
JS-0738-DM
JS-0740-DM
JS-0741-DM
# 3
# 5
JS-0703-DM
JS-0705-DM
JS-0706-DM
# 31
# 32
JS-0731-DM
JS-0732-DM
JS-0732-DM
# 1
# 2
JS-0701-DM
JS-0702-DM
# 30
1/8"
JS-0730-DM
JS-0713-IN
1/4"
# C
JS-0725-IN
JS-070C-NS
JS-070B-NS
9/64"
# 29
JS-0714-IN
JS-0729-DM
JS-0729-DM
6.7 mm
# F
JS-0767-MM
JS-070F-NS
# N
# M
JS-070N-NS
JS-070M-NS
JS-070L-NS
ORIFICE CHART
Gas Orifice Drill Size / Part#
> 3000
> 4000
> 5000
# 19
# 20
JS-0720-DM
JS-0720-DM
# 41
# 41
JS-0741-DM
JS-0709-IN
# 6
# 7
JS-0707-DM
JS-0708-DM
# 32
# 33
JS-0733-DM
JS-0734-DM
7/32"
# 3
JS-0722-IN
JS-0703-DM
JS-0703-DM
1/8"
# 31
JS-0713-IN
JS-0731-DM
JS-0731-DM
# B
15/64"
JS-0723-IN
JS-070A-NS
# 29
3.4 mm
JS-0734-MM
JS-0733-MM
1/4"
1/4"
JS-0725-IN
JS-0725-IN
JS-070D-NS
# L
# L
JS-070L-NS
JS-070K-NS
54
USA & CANADA*
> 6000
> 7000
# 20
# 22
JS-0722-DM
JS-0723-DM
3/32"
# 42
JS-0742-DM
JS-0742-DM
# 8
# 10
JS-0711-DM
# 34
# 35
JS-0735-DM
JS-0736-DM
# 3
# 4
JS-0704-DM
JS-0706-DM
# 31
# 32
JS-0732-DM
JS-0732-DM
# A
# 1
JS-0701-DM
JS-0702-DM
3.3 MM
3.3 MM
JS-0733-MM
JS-0713-IN
# D
# C
JS-070C-NS
JS-070B-NS
# K
# J
JS-070J-NS
JS-070I-MM
> 8000
# 23
# 24
JS-0724-DM
# 42
# 43
JS-0743-DM
# 11
3/16"
JS-0719-IN
# 36
# 36
JS-0736-DM
# 6
# 7
JS-0707-DM
# 32
# 33
JS-0733-DM
# 2
# 2
JS-0702-DM
1/8"
1/8"
JS-0713-IN
# B
# A
JS-070A-NS
# I
17/64"
JS-0727-IN
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