Trane OABE OADE OAKE OANE (Water Source Heat Pump) Katalog
62
OAU-PRC003A-EN
Mechanical Specifications
Options
Electric Heating Option
Primary heat is supplied using Electric Resistance heaters. Heaters shall meet the requirements of
the National Electrical Code and shall be listed by Underwriters Laboratories for zero clearance to
combustible surfaces and for use with heat pumps and air conditioning equipment. Heating
elements shall be open coil, 80 percent nickel, 20 percent chromium, Grade A resistance wire.
Type C alloys containing iron or other alloys are not acceptable. Coils shall be machine crimped into
stainless steel terminals extending at least 1 inch into the air stream and all terminal hardware shall
be stainless steel. Coils shall be supported by ceramic bushings staked into supporting brackets.
Heater frames and terminal boxes shall be corrosion resistant steel. Unless otherwise indicated,
the terminal box shall be NEMA 1 construction and shall be provided with a hinged, latching cover.
Heaters shall be furnished with a disc type, automatic reset thermal cutout for primary over
temperature protection. All heaters shall also be furnished with disc type, load-carrying manual
reset thermal cutouts, factory wired in series with heater stages for secondary protection. Heat
limiters or other fusible over temperature devices are not acceptable. Control will be SCR type. Unit
shall be suitable for use with Electric Resistance Heat. Refer to
the National Electrical Code and shall be listed by Underwriters Laboratories for zero clearance to
combustible surfaces and for use with heat pumps and air conditioning equipment. Heating
elements shall be open coil, 80 percent nickel, 20 percent chromium, Grade A resistance wire.
Type C alloys containing iron or other alloys are not acceptable. Coils shall be machine crimped into
stainless steel terminals extending at least 1 inch into the air stream and all terminal hardware shall
be stainless steel. Coils shall be supported by ceramic bushings staked into supporting brackets.
Heater frames and terminal boxes shall be corrosion resistant steel. Unless otherwise indicated,
the terminal box shall be NEMA 1 construction and shall be provided with a hinged, latching cover.
Heaters shall be furnished with a disc type, automatic reset thermal cutout for primary over
temperature protection. All heaters shall also be furnished with disc type, load-carrying manual
reset thermal cutouts, factory wired in series with heater stages for secondary protection. Heat
limiters or other fusible over temperature devices are not acceptable. Control will be SCR type. Unit
shall be suitable for use with Electric Resistance Heat. Refer to
.
Gas-Fired Heating Option
Primary heat is supplied using indirect fired gas heating. The heating section shall have a
progressive tubular heat exchanger design using stainless steel burners and Type 409 stainless
steel tubes. An induced draft combustion blower shall be used to pull the combustion products
through the firing tubes. The heater shall use a direct spark ignition (DS) system. On initial call for
heat, the combustion blower shall purge the heat exchanger for 20 seconds before ignition. After
three unsuccessful ignition attempts, the entire heating system shall be locked out until manually
reset at the thermostat/zone sensor. Units shall be comply with the California requirement for low
NO
progressive tubular heat exchanger design using stainless steel burners and Type 409 stainless
steel tubes. An induced draft combustion blower shall be used to pull the combustion products
through the firing tubes. The heater shall use a direct spark ignition (DS) system. On initial call for
heat, the combustion blower shall purge the heat exchanger for 20 seconds before ignition. After
three unsuccessful ignition attempts, the entire heating system shall be locked out until manually
reset at the thermostat/zone sensor. Units shall be comply with the California requirement for low
NO
x
emissions. Unit shall be suitable for use with Natural Gas.
Figure 48.
ER Heater