Specification
1-150.15
27
SPECIFICATIONS
Specification for Horizontal, Vertical and Power-Throw
™
Models
General
Contractor shall furnish and install steam/hot water unit heater model ______. Performance shall be as indicated on the equipment
schedule in the plans. Units shall be listed by CSA as certified to CAN/CSA-C22.2 No. 236-05 “Heating and Cooling Equipment”
and UL Std. No. 1995 “Heating and Cooling Equipment.” Additionally for Canada, the units shall have CRN registered heat
exchangers.
Casing
HSB and HC Models - Casings on model sizes 18 through 86 are 20 gauge steel (18 gauge on all other models) and consist of front
and back halves. Both halves are joined together at the top and bottom utilizing the condenser mounting screws. Casing top is
provided with threaded hanger connections for unit suspension (except for HSB 18 and HSB 24 which are directly mounted to the
supply and return piping). Fan venturi is formed in casing back half.
Vertical and Power-Throw
™
Models - Casings consist of two circular 18 gauge steel covers. With the coil in between, the covers are
securely bolted together to form a single unit. The bottom cover has a die-formed fan venturi. The top cover incorporates a motor
cooling cone, which shields the motor from coil heat therefore prolonging motor life. An opening is also provided for circulation of
motor cooling air.
All Models - Casing shall be treated to prevent corrosion and painted with a corrosion resistant, baked, polyester powdercoat gray-
green finish.
Condenser
Condenser coils are of the extended surface type, utilizing aluminum fins and DLP-type copper tubes with malleable iron supply
and return connections for HSB units, cast bronze connections for HC models and Schedule 40 steel pipe for V/PT models. Tubes
are mechanically bonded to the collars of the fins. The condensers are warranted for operation at steam or hot water pressures and
temperatures up to 150 psig and 375°F for copper coils and 250 psig and 400°F for 90/10 cupro-nickel coils.
Fins are continuous across the width and depth of the condenser and are vertically oriented to minimize the collection of dirt and
dust.
Canadian Standards Association (CSA) requirements state that explosion-proof units (Power Codes 06 and 09) may not be used
with fluid temperatures in excess of 329°F or pressures in excess of 87 psig and still maintain their explosion-proof rating for
National Electric Code ignition temperature rating T3B for grain dust.
All coils are leak tested at 165 to 200 psig, air under water.
Horizontal Models - Coils are of serpentine design with horizontal tubes, vertical fins and center supply and return connections at
top and bottom of unit (except HC models, which have side connections). All tube bends are brazed. All tubes have individual
expansion bends. Copper tubes are 1" O.D. with 0.030" wall thickness (except HSB/HC 18 and 24 which are 5/8" O.D. with 0.028"
wall thickness).
Vertical and Power-Throw
™
Models - Coils are circular, providing for natural expansion. Each tube is continuous between supply and
return header. All tube joints are silver soldered. Copper tubes are 5/8" O.D. with 0.028" wall thickness.
Motors - See page 8 for Power Code and motor descriptions and page 23 for motor amp draw information. Motors are designed for
continuous duty and can operate in a maximum ambient temperature of 104°F(40°C).
Fans/Fan Guards - Fans are aluminum on all units and are secured to a steel hub. Each fan is balanced and is designed specifically
for the unit heater on which it is installed. Horizontal units are equipped with a combination fan guard/motor-mounting bracket. The
guard is constructed of steel rod. Vertical units are supplied with an outlet fan guard covering the opening in the bottom of the unit.
Air Deflectors - Horizontal units, including the Power-Throw
™
units, are furnished with horizontal air deflectors as standard. The
deflectors are adjustable to almost any desired position for downward, straight or upward airflow. Vertical deflectors are available
as an accessory for HSB/HC models through size 193, standard on model sizes 258-340. See page 22 for air outlet accessories for
vertical models.