TwinPack
TwinPack Vertical Stack
The TwinPack is a Main/Secondary combination that is pre-piped and housed in a common cabinet assembly at the factory. TwinPack Vertical Stack units include a UL 1 Hour Through Penetration Firestop W-L-7089 system. Local codes may dictate exact amount and placement of drywall. Each unit has its own set of valves and controls.
Pre-Piped
Configuration
UL 1 Hour
Fire Rating
300 PSIG
Max Working Pressure
180°F
Max Water Temp
Project Documents
Downloads
Technical Details
Features & Specifications
Chassis
All unit chassis shall be fabricated of heavy gauge cold-rolled steel cabinet painted in epoxy powder coated soft white paint. All exterior panels shall be insulated with 1/2" thick, 1.5 pound per cubic foot, dual density fiberglass insulation rated for a maximum air velocity of 3600 f.p.m. Insulation shall conform to UL 181 for erosion and NFPA 90A and 90B for flame spread (25) and smoke developed (50) rating per UL 723 and CAN./ULC, S102-M88.
Available Options
- Foil faced insulation in lieu of standard, meeting ASTM Standards C665 and C-1136 for biological growth
- Elastomeric closed cell foam insulation with antimicrobial performance rating of zero per ASTM G21
Coil
All cooling and heating coils shall optimize rows and fins per inch to meet the specified capacity. Coils shall have seamless copper tubes and shall be mechanically expanded to provide an efficient, permanent bond between the tube and fin. Fins shall have high efficiency aluminum surface optimized for heat transfer, air pressure drop and carryover. All coils shall be hydrostatically tested at 350 PSIG air pressure under water, and rated for a maximum of 300 PSIG working pressure at 180°F maximum water temperature.
Available Options
- Coil casing fabricated from 304 stainless steel
- Manual air vent fitting for coil venting
- Manual water drain fitting for coil draining
- Automatic air vents in lieu of manual air vents
- Heating coils in re-heat or preheat position with chilled water coils
Drain Pan
Condensate drain pan shall be single wall, heavy gauge, powder coated epoxy and extend under the entire cooling coil. Drain pan shall be of one piece construction and be positively sloped for condensate removal. The drain pan shall be externally insulated with closed cell foam insulation carrying no more than a 25/50 Flame Spread and Smoke Developed Rating per ASTM E-84 and UL 723.
Available Options
- Single wall primary drain pan constructed entirely of heavy gauge type 304 stainless steel
Electric Heat
Electric resistance heating assembly as an integral part of the fan coil unit, with the heating capacity, voltage and kilowatts scheduled. The heater assembly shall be designed and rated for installation without duct extensions or transitions. All heating elements shall be open coil type Nichrome wire mounted in ceramic insulators. All heaters include over temperature protection with automatic reset primary thermal limit and backup secondary thermal limit.
Piping Package
Factory assembled valve piping package consisting of a 2 or 3 way valve body, on/off motorized electric control valve actuator and two isolation ball valves. Control valves are piped normally closed to the coil. Maximum entering water temperature on the control valve is 180°F, and maximum close off pressure is 75 PSIG (1/2") or 44 PSIG (3/4"). Maximum allowed pressure shall be 300 PSIG.
Available Options
- 3 wire floating point modulating control valve
- Fixed or adjustable flow control device
- Pressure temperature ports
- Strainer for each package
Electrical
Units shall be furnished with a J-Box wrapper, wired for single point power connection.
Available Options
- Electrical junction box with multiple position 1/4" spade terminal block
- Electric heat shipped loose or integrated
- Fusing, disconnects, sensors and switches
Filter
All units shall be furnished with a one inch thick, throwaway filter, flatly mounted with spring loaded clips on the front of the coil for easy maintenance without the use of tools.
Available Options
- Washable filters
WARNING: This product can expose you to chemicals including epichlorohydrin which is known to the State of California to cause cancer and birth defects and/or other reproductive harm. For more information go to p65warnings.ca.gov
ER Series
Related Products
Ready to Specify?
Our team of experts can help you select the right vertical stack fan coil configuration for your project.