22
MAX-E-THERM
®
Pool and Spa Heater Installation and User’s Guide
P/N S794 Rev. H 8-11-14
Section 2. Installation
4. Install vent pipe so that it can expand and contract freely as the temperature changes. Support the vent pipe according
to applicable codes and the vent manufacturer’s instructions. Pipe support must allow the vent pipe free movement
out and back, from side to side, or up and down as necessary, without putting a strain on the heater or vent body. Slope
horizontal pipe runs up from the heater at least 1/4" per foot (2cm per meter). Install Listed condensate drains at low
points where condensate might collect. Plumb condensate drains to a drain through hard piping or high temperature
tubing such as silicone rubber or EPDM rubber – do not use vinyl or other low temperature tubing. Follow drain
manufacturer’s installation instructions.
5. Use Listed fire stop for floor and ceiling penetrations. Use Listed thimble for wall penetrations. Use a Listed roof
flashing, roof jack, or roof thimble for all roof penetrations. Do not fill the space around the vent (that is, the clear air
space in the thimble or fire stop) with insulation. The roof opening must be located so that the vent is vertical.
6.
Do not run the heater vent into a common vent with any other appliance.
WARNING
Fire Hazard. Do not vent the heater directly into a masonry chimney.
Installation into a masonry chimney must use a
chimney liner and must meet the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane
Installation Codes requirements and all local code requirements.
WARNING
Risk of fire, carbon monoxide poisoning, or asphyxiation.
It is recommended to use a CO Monitor and Fire Alarm in rooms
that contain gas fired appliances.
DIRECT AIR INTAKE DUCT WITH 3-INCH PVC PIPE (INDOOR INSTALLATION)
Combustion 3 in. PVC Pipe
Inlet Air Intake Duct Requirements*
Combustion Air Intake 3 in. Pipe
(Vertical or Horizontal)
No. of 90° Elbows Maximum Length in Feet (M)
0
70 ft. (21.3 M)
1
58 ft. (17.7 M)
2
46 ft. (14.0 M)
3
34 ft. (10.4 M)
4
22 ft. ( 6.7 M)
WARNING!
DO NOT USE PVC PIPE FOR FLUE EXHAUST
VENT. FLUE EXHAUST VENT
TEMPERATURES CAN BE IN EXCESS OF
400° F. FLUE EXHAUST VENT
MUST BE
CATEGORY I or CATEGORY III METAL VENT.
Note (*): Combustion Air Intake Duct Connection Kit (Part Number
475002) for all Max-E-Therm
®
heater models can be purchased
separately. See page 51 for parts list.
NOTE
Each 90-degree elbow reduces the
maximum horizontal PVC air intake
duct run by 12 feet and each 45-
degree elbow in the PVC air intake
duct run reduces the maximum run
by 6 feet. See the Table 5 above for
the maximum lengths using 90-
degree elbows.
