Install Instructions

Mascot ST Tankless Water Heater
Page 3
Model Name MSTWW199
Gas Input Rate
MAX 199,000 Btu/h
MIN 19,900 Btu/h
Hot Water Capacity
35°F Rise 11.0 GPM
45°F Rise 8.5 GPM
77°F Rise 5.0 GPM
Installation Indoor Wall Hung
Flue System Sealed Combustion Direct & Single Vnet
Vent Run 2″(50ft) / 3″(100ft) Schedule 40 PVC, CPVC, PP, ABS
Gas Supply Pressure
NG 3.5˝ WC to 10.5˝ WC
LP 8.0˝ WC to 13.0˝ WC
Manifold Pressure
Gas Type NG LP
MAX Fire
-0.11” to -0.17” WC -0.07” to -0.11” WC
MIN Fire
-0.10” to -0.16” WC -0.06” to -0.10” WC
Power Supply
Main Supply 120V 60Hz / 4A
Maximum
Power Consumption
135W(82W+53W_Ceramic heater)
Ignition System Direct Electronic Ignition / Automatic Flame Sensing
Burner System Single Orice Premixed Fuel Modulation Metal Fiber Infrared
Gas Valve System Air ratio valve
Minimum Flow Rate 0.5 GPM
Internal Pipe Material STS 304
Dimensions W17.3 ″ – H28.7 ″ – D14.8 ″
Weight 88 lbs
Sub Heat Exchanger Water Capacity Under 2 Gallon
Control Panel / Main Controller P-920C / GTH-9500C
Water Pressure
MAX Hot water 150 psi
MIN 15 psi
Connection Sizes
Cold Water Inlet /
Hot Water Outlet
3/4″NPT
Gas Inlet 3/4″NPT
Materials
Casing Cold Rolled Carbon Steel
Heat Exchanger
Primary Heat Exchanger : STS 304
Secondary Heat Exchanger : STS 304
Safety Devices
Flame Rod, Overheat Cut Off Limit Switch , Gas Leak Detector
sensor, Exhaust Temperature High Limit Switch, Water Tem-
perature High Limit Switch, Frost Protection Ceramic Heater
2.2 Specications
• Temperature
Operating ambient Temperature Range : -10 to 60°C.
Operating Relative Humidity up to: 90% at 40°C.
Shipping & Storage Temperature Range of : -20 to 80°C.