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1. General Information

UNIT SUSPENSION / INSTALLATION

UNIT SUSPENSION

Horizontal delivery units, Model WTC/WSC Series. All

horizontal delivery units, except Models WTC 18 and WTC 24,

have two tapped holes in the top for unit suspension. WTC 18

and WTC 24 models do not require independent suspension and

are installed directly on their supply piping. Models WTC 33-86

and WSC 18-86 have 3/8"-16 tapped holes, model sizes 108

and larger have 1/2"-13 tapped holes. Piping support hangers

or clamps are recommended and should be placed as close

to the unit heater as possible. For other models, independent

suspension can be made with threaded rods, pipes, or ceiling

hanger brackets. See Figure 5.1.

Vertical delivery units. Vertical delivery Models WVC/WVN

42 through WVC/WVN 279 have four tapped holes (1/2"-13)

in the top cover for unit suspension. Unit suspension for these

models can be made with threaded rods, pipes or ceiling hanger

brackets. Models WVC/WVN 333 through WVC/WVN 952 are

equipped with an angle-iron mounting bracket that has eight 5/8"

diameter hanger holes permitting hook-hoisting and suspension

with cables, if desired. A 1/2" x 3" center U-bolt can be inserted

in the two holes at each end of the bracket to accommodate

suspension with four threaded rods, pipes or hanger brackets.

"Power-Throw" horizontal delivery units. "Power-Throw"

units are designed for horizontal air delivery and are equipped

with hanger brackets for suspension. Three hanger brackets are

supplied for Model WPC/WPN 279, one on the front, and two

on the rear panel for three-point suspension. Only two hanger

brackets are furnished on the front panel of Models WPC/WPN

333 through WPC/WPN 952 (for required four-point suspension

use the two hanger brackets on the front panel and the two

holes on the ends of the upper angle supports at the rear of the

unit). Each hanger bracket has a 5/8" diameter mounting hole

for hook-hoisting and suspension with threaded rods, pipes, or

cables.

Note: A pipe hanger adapter kit as illustrated in Figure 5.1

is available as an accessory from Modine. The kit consists of

two drilled 3/4" I.P.S. pipe caps and two capscrews to facilitate

threaded-pipe suspension. One kit will mount applicable WTC or

WSC models, two kits are required for WVC/WVN models.

Figure 5.1 - Unit Suspension

Threaded Pipe

Suspension

Method

Pipe Hanger

Adapter Kit

WVC/WVN 42 Thru WVC/WVN 279

Piping - See Figure 6.1

1. Branch piping to and from unit heater should include swing

joints to allow for expansion and contraction of the piping

without placing a strain on the unit heater element. On steam

systems, the branch piping should be taken off and returned

above the centerline of the supply and return lines.

2. Install pipe unions and shut-off valves in lines to and from

each unit heater to allow maintenance or replacement of unit

without shutting down and draining entire system. For hot

Threaded Rod

Suspension

Method

WSC 18 Thru WSC 340

WTC 33 Thru WTC 340

WVC/WVN 333 Thru WVC/WVN 952

water systems, include a balancing valve in return line for

water flow regulation. A drain valve should also be provided

below each unit heater to allow removal of water from the

heating coil if located in an area subject to freezing.

3. In steam or hot water systems, rapid air removal is required

because entrained air is a cause of corrosion. Hot water

systems should be equipped with suitable air vent valves for

rapid and complete removal of air at the high points and ends

of both supply and return mains. Proper air venting for steam

systems can be achieved by use of a steam trap with an

internal air vent.

4. Traps must be located below the outlet of the unit. Consult

trap manufacturer for specific recommendations. Each steam

unit heater should be provided with a trap of sufficient size

and capacity to pass a minimum of two times the normal

condensate released by the unit at the minimum differential

pressure in the system. Trap capacity is based on the

pressure differential between supply and return mains. Steam

systems should be equipped with a float and thermostatic trap

or an inverted bucket trap with an air bypass.

5. It is advisable to use a pipe line strainer before each steam

trap draining a unit heater. This protection will reduce the

maintenance of the steam trap. When strainers are used they

should be installed between the unit heater and the trap and

be the same size as the trap tapping. In order to catch dirt

and scale, the strainer should have a screen perforation size

smaller than the trap orifices.

6. On systems where the steam supply to the unit heater is

modulated or controlled by a motorized valve, a vacuum

breaker should be installed between unit outlet and the trap.

If a vacuum breaker is used, it should be in conjunction with a

float and thermostatic trap.

7. Install a scale pocket at bottom of unit heater to collect dirt

and scale as shown in illustrations. Pipe diameter must be the

same size as unit connections and about 6" long.

8. Provide adequate pipe hangers, supports, or anchors to

secure the piping system independently of the unit heater.

Electrical Connections

1. Disconnect power supply before making wiring connections

to prevent electrical shock and equipment damage.

2. All appliances must be wired strictly in accordance with

wiring diagram furnished with the appliance. Any wiring

different from the wiring diagram could result in a hazard

to persons and property.

3. Any original factory wiring that requires replacement must

be replaced with wiring material having a temperature

rating of at least 105°C.

4. Ensure that the supply voltage to the appliance as indicated

on the serial plate is not 5% greater than the rated voltage.

1. Do not install units below 8 feet measured from the bottom

of the unit to the floor.

2. Do not reuse any electrical component which has been

wet. Replace component.

3. Ensure that the supply voltage to the appliance, as indicated

on the serial plate is not 5% less than the rated voltage.

1. Installation of wiring must conform with local building codes,

or in the absence of local codes, with the National Electric

Code ANSI/NFPA 70 - Latest Edition. Unit must be electrically

grounded in conformance to this code. In Canada, wiring must

comply with CSA C22.1, Electrical Code.

AIR 1-550.30

WARNING

CAUTION