Sigma 30-H, 40-H, 47-H, 58-H, 62-H Installation And Operation Manual

MANUFACTURERS

OF H YDRONIC

H EATING

P

RODUCTS

Unit Heaters

Installation and Operation Manual

www.sigmaproducts.com Tel: (905) 453

-0446 Fax: [phone]

Rev 2

I NSTALLER’S R ESPONSIBILITY

This equipment has been inspected, tested
and shipped free of defects. However, it is

the installer’s responsibility to check for
loose wires, leaks, or loose fasteners, and
correct any problem that may be found.
Inspect the equipment immediately when
received to determine if there is any damage
from shipment. First, check for visible
damage to the unit. Turn the fan by hand to
determine if any damage has occurred. If
any damage has been found, the receiver
should note the damage on the bill of lading
and immediately file a claim with the
transport company.

It is the equipment owner’s responsibility to
provide any scaffolding or other apparatus to
allow service or periodic maintenance to this
equipment.

INSTALLATION

Unit Heaters

Installation & Operation Manual

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Warning: Disconnect all power, steam,
or water supplies before installing or
servicing the unit. Do not depend on a
thermostat or other switch as sole means
of disconnecting power. Always
disconnect power at the main breaker.

Caution: Insure that all power sources
conform to the requirements of the unit
heater or damage to the unit will result.
All external wiring and piping must
conform to the local and national codes.

Warning: Improper installation,
adjustment, alteration, service, or

maintenance can cause damage, injury, or
death. Read this manual thoroughly before
installing, operating, or servicing.

Rev 2

U NIT MOUNTING

Install unit heaters to meet Occupational
Safety and Health Act (OSHA). Unit heaters

mounted less than 8 feet (2.4 meters) above
the floor must be equipped with a fan guard.
Ensure that all hardware used in the
suspension of each unit heater is more than
adequate. Failure to do so may result in
extensive property damage, severe personal
injury, or death.

Suspension nuts are provided on the top of
all models. Support rods should be installed
so that they support the total weight of the
unit heater to assure that no strain is placed
on the supply and return piping. Provisions
for removal of the unit from the suspension
rods may be desirable for future servicing.
Otherwise, the provision of sufficient
clearance around the unit heater for future
maintenance and servicing is required.

Note: Increasing clearance distances may
be necessary if there is any possibility of
distortion or discoloration of adjacent

materials.

It is assumed that the type of system to be
used has been selected by the design
engineer. The diagrams shown in the
manual are for different types of steam or
hot water systems.

It is important that the system be kept clean
and free of foreign substances, such as

excessive joint materials, etc.

For steam systems it is recommended that
the unit be mounted level for proper
condensate drainage. Swing joints should be
used in piping, and piping should be pitched
down so condensate can drain freely.

Isolators are not required, but may be
desirable for some applications. Refer to
dimensional drawings for unit weights.

Hanging hardware is not included with the
unit (to be field supplied).

Place unit heaters at points of greatest heat
loss. Blanket outside doorways and provide
ample coverage of window areas. Keep the
unit heaters away from objects that will
impede the full and natural air delivery of the
units.

PIPING

Refer to the appropriate model dimensional
drawing to determine the piping connection
type, size, and location. Follow standard
practices and codes when installing piping.
Provide swing joints for expansion purposes,
unions and shut-off valves for servicing
purposes, as well as valves and traps for
control purposes. Refer to Typical Piping
Connections Diagrams for details.

Unit Heaters

Installation & Operation Manual

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Rev 2

Important: Unit heaters must be hung

level from side to side, and front to back.
Failure to do so will result in poor
performance and/or premature failure of
the unit.

C OIL OPERATION

Maximum recommended steam pressure for
standard units is 15 psig at 275ºF. The

maximum recommended pressure for hot
water applications is 150 psig at 275ºF. For
higher operating temperatures and
pressures, special coils and ratings are
required.

U NIT OPERATION

Most basic unit heater systems are
controlled by a room thermostat. Install
thermostat on an inner wall or column to

achieve optimum control of that area. Set
thermostat for desired temperature.

For steam systems, a low temperature set­point limit could be used to prevent the fan
from blowing cold air when there is no steam
passing through the coil.

Small hot water systems could have the
circulating pump controlled directly by the

room thermostat. Large systems may use
zone valves to control individual unit heaters
where constant water circulation is used on
the pain system.

A louvered cone air diffuser is available as
an optional accessory for vertical unit
heaters.

MAINTENTANCE

Motor Lubrication. Standard motors are

pre-lubricated and normally are not
equipped with grease fittings. For motors
that are equipped with grease fittings,
contact the local motor manufacturer service
facility to obtain information on the grease or
oil type, and the method and frequency of
lubricating. The frequency of lubricating will
depend on operating conditions and length
of running time.

Unit Heaters

Installation & Operation Manual

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-0446 Fax: [phone]

Warning: Disconnect all power, steam or
water supplies before installing or
servicing the unit. Do not depend on a
thermostat or other switch as sole means
of disconnecting power. Always
disconnect power at the main breaker.

Caution: Allow rotating fans to stop
before servicing to avoid serious injury to
fingers and hands.

Rev 2

C LEANING

For cleaning or maintenance purposes, the
fan-motor assembly can be removed from

the unit heater. The unit casing, fan, diffuser,
and coil should be cleaned thoroughly once
each year. The heating performance and air
throw depend on cleanliness of the coil and
fan blades.

When cleaning the fan-motor assembly,
wipe all excess dirt or lubricant from the
motor casing. Buildup on the motor casing
will cause it to run hot and eventually cause
inconvenience or discomfort due to random
automatic thermal overload shut down, or
could cause internal motor damage. Note:
standard unit heater motors have integral
automatic thermal overload protection.

Clean the coil by loosening dirt with a brush
on the fan side of the coil, then operate the

unit allowing the fan to blow the loosened
dirt through the unit. Use high pressure air or
steam on the coil away from the fan.

Use a damp cloth to clean the casing, fan
blades, or diffuser. If rust spots are found on
the casing, they should be cleaned and
repainted.

Tighten the fan guard, motor frame and fan
bolts. Check the fan for clearance in the

panel orifice and free rotation.

The heater system should be checked once
per year by a qualified technician. All
maintenance and service information should
be recorded.

TABLE 1 TROUBLE-SHOOTING CHART

SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION

Leaking Coil 1. Frozen coil

2. Defective coil

3. Corrosion

4. Leak in joint

1. Replace coil.

2. Replace coil.

3. Replace coil.

4. Braze joint if joint is exposed where leak has
occurred.

Poor output
on steam

1. Check for air in coil

2. Lint on coil fins

1. Repair or replace thermostatic air vent.

2. Clean coil and fins. Check filter and clean.

Poor output
on steam or
hot water

1. No circulation of water through coil

2. Short cycling of motor

3. Backward rotating motor

1. Check circulation pump. Check for blocked tubes.

2. Check voltage and correct. Remove and service
motor to confirm if automatic overload needs
repair.

3. Change direction of motor rotation to by making
appropriate wiring changes as recommended by
the motor manufacturer.

Noisy or
vibrating unit

1. Damaged fan

2. Dirty fan

1. Change fan.

2. Clean fan.

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Installation & Operation Manual

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Rev 2

F IGURE 1

DIMENSION D IAGRAM

FOR HORIZONTAL U NIT

H EATER WITH

SERPENTINE C OIL

(30-H & 40 -H)

F IGURE 2

DIMENSION D IAGRAM

FOR HORIZONTAL U NIT

HEATER WITH MULTI-

CIRCUITED C OIL
(47 -H TO 245-H)

TABLE 2 H ORIZONTAL UNIT H EATER SPECIFICATIONS

D

IMENSIONS (IN

) M

AX THROW (FT

)

MODEL

F IGURE

REF.

A B C D E F G

WT

(LB)

MAX.

MTG.

HT (FT)

W/ H ORIZ.

L

OUVERS

W/ V ERT.

L

OUVERS

30-H 1 22 13.5 4.75 8 7.50 15.5 0.50 40 9 18 23
40-H 1 22 13.5 4.75 8 7.50 15.5 1.25 40 10 23 29
47-H 2 27 16.5 5.00 8.5 7.75 16.25 1.25 48 10 23 29
58-H 2 27 16.5 5.00 8.5 9.50 18.0 1.25 48 10 28 35
62-H 2 31.5 19.5 5.625 10 9.50 19.5 1.25 71 10 25 30

84-H 2 31.5 19.5 5.625 10 7.50 17.5 1.50 76 12 32 40
133-H 2 37.0 24.0 5.875 10 7.75 17.75 1.50 108 13 40 50
200-H 2 42.5 28.5 5.50 10 9.50 19.5 1.50 148 15 50 64
245-H 2 46.5 31.5 5.50 10 9.50 19.5 1.50 172 16 54 68

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Installation & Operation Manual

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Rev 2

F IGURE 3

DIMENSION D IAGRAM

FOR V ERTICAL UNIT

HEATER

TABLE 3 VERTICAL UNIT HEATER SPECIFICATIONS

DIMENSIONS (IN)

M

ODEL

A B C D E F G H J

40-V 18.5 10 2.625 1.25 1.5 3/8-16 UNC 2.75 6.125 1.25
50-V 18.5 10 2.625 1.25 1.5 3/8-16 UNC 2.75 6.125 1.25
54-V 22 13 2.625 1.25 1.5 3/8-16 UNC 2.75 6.125 1.5
67-V 22 13 2.625 1.25 1.5 3/8-16 UNC 2.75 6.125 1.5
78-V 26.5 16 2.625 1.25 1.5 3/8-16 UNC 2.75 7.625 1.625

100- V 26.5 16 2.625 1.25 1.5 3/8-16 UNC 2.75 7.625 1.625

145-V 30.875 20 3.375 1.5 2 3/8-16 UNC 2.75 7.625 2
210-V 36.875 25 3.375 1.5 2 3/8-16 UNC 2.75 7.625 2.375
300-V 44.125 30 4.125 2 2.5 1/2-13 UNC 3 9.125 3
370-V 44.125 30 4.125 2 2.5 1/2-13 UNC 3 13.625 3
375-V 44.125 30 4.125 2 2.5 1/2-13 UNC 3 9.125 3
480-V 44.125 30 4.125 2 2.5 1/2-13 UNC 3 13.625 3

DIMENSIONS (IN) MAX. MTG. H T. (FT)

MODEL

K L M N P R S

WT (LB)

WITHOUT

L OUVER

WITH

L OUVER

40-V 3 11.5 12.25 6 1.125 6.25 8.875 49 12 16
50-V 3 11.5 12.25 6 1.125 6.25 8.875 50 17 22
54-V 3 11.875 14.375 6 1.25 7 10 62 13 16
67-V 3 11.875 14.375 6 1.25 7 10 63 19 23
78-V 2 12.25 16.375 7 1 7.25 10.625 85 14 17

100- V 2 12.25 16.375 7 1 7.25 10.625 90 21 25

145-V 2.375 13.5 20.375 7 1.5 9 13.25 118 23 28
210-V 4 15.25 24.5 7 1.25 8.5 11.875 146 26 32
300-V 3 15.875 30.5 7 0.75 9.5 13.75 200 26 32
370-V 1.875 19.25 30.5 7 0.75 9.5 13.75 265 28 34
375-V 4.5 17.375 30.5 8 0.75 9.5 13.75 205 40 48
480-V 2.5 19.875 30.5 8 0.75 9.5 13.75 270 42 52

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Installation & Operation Manual

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Rev 2 Rev 2

F IGURE 4 TYPICAL PIPING CONNECTIONS

Unit Heaters

Installation & Operation Manual

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Rev 2