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AHE Series 3 and 4 Direct Vent Wall-Mounted Boilers — High Altitude Conversion Kit Instructions
Part number 550-141-597/0800
Weil-McLain
500 Blaine Street
Michigan City, IN 46360-2388
http://www.weil-mclain.com
A United Dominion Company
Parts
Boiler model number Altitude (feet) Kit part number Air pressure switch setting
AHE-45
4,000 to 7,999 382-930-335 0.30" w.c.
8,000 to 12,000 382-930-340 0.25" w.c.
AHE-60
4,000 to 7,999 382-930-340 0.25" w.c.
8,000 to 12,000 382-930-340 0.25" w.c.
Note: Kit includes (1) Air Pressure Switch, (1) Conversion Instruction, (1) Conversion Label and (1) Consumer Protection Label.
Figure 1
Air pressure switch wiring and tubing
Red
Red
Pressure switch
Normally
open
Normally
closed
Common
56701
Conversion instructions
The air pressure switch and gas manifold pressure must be correct for the altitude at the job site. Failure to install
correctly could result in nuisance shutdowns or production of poisonous carbon monoxide gas, causing severe
personal injury, death or substantial property damage.
AHE boilers must be modified for high altitude operation at the job site as follows:
1. Remove tubing and wires from existing pressure switch. See Figure 1. Remove air pressure switch and replace with pressure
switch in kit.
2. Remove the Conversion label (part number 550-224-309), supplied in kit. Place a checkmark on the label for the altitude range.
3. Adjust gas manifold pressure to proper value shown on Conversion label.
4. Affix Conversion label (part number 550-224-309) on jacket near rating label.
5. Follow Boiler Manual “Checkout” procedures to assure the boiler is now operating properly after conversion parts are installed.