Mascot ST Tankless Water Heater
Page 21
4.7.3 Single Venting
Read and Follow Sections 4.3 Guidelines First.
1. Insert the termination end cap into the intake air
duct.
2. Provide two openings to allow for circulation of
combustion air as specified by ANSI Z224.1/NFPA
54 or CAN/CGA B-149.1:
Model
MSTWW199
Maximum Input
(BTU/H)
199,000
Indoor make up air is
provided, a minimum free
area of 1 in 2 per
1,000 BTU/H
199 in 2
14 1/4"
(W) x
14 1/4" (H)
4.8 Vent / Air Pipe Termination
Note : For using pipe more than 1 elbow,
reduce maximum allowable length
• 5 feet (1.5M) for each additional 3-inch
90-degree elbow
• 2.5 feet (0.75M) for each additional 3-inch
45-degree elbow
• 8 feet (2.4M) for each additional 2-inch
90-degree elbow
• 4 feet (1.2M) for each additional 2-inch
45-degree elbow
• The thickness of the wall vents installed : Min
4˝ ~ Max 20˝
• Direct Vent - Sidewall Terminations
Horizontal Vent Termination
Vent Termination
1. Rodent Screen Installation
• Install Rodent Screen and Vent Terminal
(additional purchase), see Figure for appropriate
configuration.
• After connecting vent/air inlet terminal, it is
required to install screen for the terminal to
prevent incoming of rodent, which might cause
damage to the unit. (Extra purchase accessory
2/3˝ screen vent 1/4˝ mesh)
Summary of Contents for MSTWW
Page 38: ...LAARS Heating Systems Page 36 4 19 Wiring Diagram Figure 3 Wiring Diagram...
Page 39: ...Mascot ST Tankless Water Heater Page 37 4 20 Ladder Diagram Figure 4 Ladder Diagram...
Page 63: ...Mascot ST Tankless Water Heater Page 61 Cover Assembly...
Page 66: ...LAARS Heating Systems Page 64 Notes...
Page 67: ...Mascot ST Tankless Water Heater Page 65 Notes...
