Liebert SGH Steam Istruzioni operative

SGH Steam

Generating Humidifier

Installation and

Operation Guide

IMPORTANT: Read and save this guide for future

reference. This guide to be left with equipment owner.

SL-14050 Form # 99-428 Rev. 1 / 150-1633 Rev. A

Table Of Contents

INSTALLATION 1

RECEIVING & UNPACKING EQUIPMENT ................................1

PRE-INSTALLATION CHECKPOINT ...................................1

BASIC HUMIDIFIER CONFIGURATION..................................1

LOCATION & MOUNTING .........................................1

HUMIDIFIERS .............................................1

BLOWER PACKS............................................2

STEAM DISTRIBUTORS ........................................3

PLUMBING.................................................5

WATER SUPPLY LINE .........................................5

DRAIN LINE...............................................6

STEAM LINE ..............................................6

ACCESSORIES - FILL CUP EXTENSION KIT(S) ...........................8

CONDENSATE RETURN LINE.....................................8

ELECTRICAL................................................9

PRIMARY VOLTAGE SUPPLY WIRING TO HUMIDIFIER.......................9

PRIMARY VOLTAGE SUPPLY WIRING FROM HUMIDIFIER(S) TO BLOWER PACKS .......9

LOW VOLTAGE CONTROL WIRING..................................9

On-OffControls ...........................................9

CONTROL INSTALLATION ......................................10

OPTIONAL MODULATION (CONTINUOUS CONTROLS) ......................10

OPTIONAL MODULATION (CONTINUOUS CONTROL) PACKAGES BY LIEBERT.........11

OPERATION 11

INTRODUCTION .............................................11

SGH OPERATION ............................................11

END OF CYLINDER LIFE .......................................11

MANUAL CAPACITY ADJUSTMENT .................................11

On/Off Controls...........................................11

Modulation Control .........................................12

OTHER POTENTIOMETERS .....................................12

DETECTING WATER SUPPLY DEFICIENCY ............................12

REMOTE INDICATION ........................................12

DOUBLE UNIT OPERATION .....................................12

BLOWER PACK OPERATION ....................................12

INSTALLATION

RECEIVING & UNPACKING EQUIPMENT

1. Check packing slip to ensure ALL material has

been delivered.

2. All material shortages are to be reported to

Liebert within 48 hours from receipt of goods.

Liebert assumes no responsibility for any

material shortages beyond this period.

3. Inspect shipping boxes for damage and note

on shipping waybill accordingly.

4. After unpacking, inspect equipment for

damage and if damage is found, notify the

shipper promptly.

5. All Liebert products are shipped on an F.O.B.

factory basis. Any and all damage, breakage

or loss claims are to be made directly to the

shipping company.

PRE-INSTALLATION CHECKPOINT

1. Ensure that available voltage and phase

corresponds with humidifier voltage and phase

as indicated on humidifier’s nameplate label

(see Figure #1).

2. Ensure that the dedicated external disconnect

is of sufficient size to handle the rated amps

as indicated on the nameplate label. Refer to

local codes.

3. Report any discrepancy immediately.

BASIC HUMIDIFIER CONFIGURATION

Liebert humidifier model SGH has a right side

electrical compartment. Each electrical compartment

has a hinge-down front door which is removable from

any partially or fully opened position. Each electrical

compartment has a screw-mounted right side cover

which can also be removed for ease of electrical

connection. For safety, the door when closed keeps

the side cover from being removed.

Single units have a plumbing compartment

attached to the left side of the electrical. Double units

have a second plumbing compartment. Each

plumbing compartment has a hinge-down front door

which is not intended to be removed. For safety, the

door must be closed in order to engage the lock. To

avoid any danger, never operate the humidifier with a

door off. For safety, each door when closed engages

its own safety interlock switch. All switches must be

engaged before the unit will operate.

To open the doors, unlock key, lift door up slightly

and pull top of door forward. Door will hinge 180

degrees and hang straight down. To remove door,

swing door parallel to floor. Then lift up slightly and

out. To reinstall door, hold parallel to floor and insert

hinge pins at bottom. The door can then be closed.

LOCATION & MOUNTING

HUMIDIFIERS

SGH humidifiers are designed to mount on a

suitable wall or vertical surface. Do not sit on floor due

-1-

Power And

Control

Wiring

Condensate

Return

Steam

Outlet

Drain

Water

Nameplate

Label

Figure #1

SGH Series Humidifier

TOP VIEW

WALL

WITHOUT BLOWER PACK

MIN. 36" SIDE

CLEARANCE

RECOMMENDED.

SEE NOTE.

NOTE: LOCAL AND NATIONAL

CODES MAY DEVIATE. PLEASE

CONSULT APPLICABLE CODES

FOR CLEARANCE REQUIREMENTS

IN ALL CASES.

MIN. 36"

FRONTAL

CLEARANCE.

Figure #2

Clearance Requirements

to clearances required for plumbing, electrical, and

control entrances. The clearance dimensions shown

in this manual are for reference only and are the

minimum required for maintenance of the humidifier.

Local and National Codes should be consulted prior to

final location and installation of the humidifier. Liebert

can not accept responsibility for installation code

violations.

1. Location of the humidifier should be below and

as close as possible to the steam distributor

location as possible.

2. For front and side clearance requirements (for

access during installation, maintenance and

troubleshooting), see Figure #2.

3. If possible, DO NOT locate humidifier any

further than absolutely necessary from steam

distributor location, as net output will be

reduced as a result of heat loss through steam

hose. Also, increased static pressure may

cause operational problems and necessitate

use of the fill cup extension kit and other

components.

4. Where possible, mount humidifier at a height

convenient for servicing.

5. Wall mounting bracket provided should be

securely attached horizontally and open edge

upwards, using field-supplied fasteners. Use

a minimum of 3 - #12 x 3" long wood screws,

or better, into a vertical structural surface. If

any spacer material is used between the

bracket and the structural material such as

drywall, increase fastener length accordingly.

In addition, install a minimum of 2 field

supplied fasteners in the holes provided in the

back of the unit to prevent the unit from being

bumped off the wall bracket.

6. Make sure humidifier is level.

7. DO NOT mount humidifier on hot surfaces.

8. If humidifiers are mounted on roof, a

thermostatically ventilated weatherproof

cabinet by others should be used. Consult

factory.

9. DO NOT mount humidifiers in an area where

freezing may occur.

10. DO NOT mount humidifiers on vibrating

surface.

BLOWER PACKS

1. Blower packs are an optional accessory used

to directly distribute steam to localized areas

(such as computer rooms) or in structures that

do not have a built-in air distribution system.

2. Blower packs are available integrally-mounted

on humidifier (built-on blower pack, BOBP,

see Figure #4) or detached and field-piped

and wired to humidifier (remote mounted

blower pack RMBP, see Figure #5).

-2-

See Figure #6 for mounting clearances.

005-030

7.7"(19.6cm)

050-200

7.7"(19.6cm)A

WALL

FASTENWALLBRACKET

(FACTORYSUPPLIED)TO

WALLUSING ANCHORBOLTS

(3) SUPPLIEDBYOTHERS

7.7”

(19.6 cm)

Figure #3

Wall Bracket Mounting Detail

Figure #4

Built On Blower Pack

Power And

Control

Wiring

Optional

Built-On

Blower Pack

Single

Circuit

Humidifier

Built-In

Supply Air

Grille

Built-In Steam

Distributor

FRONT WALL

SIDE

STEAM

CONDENSATE

005-030

3.2" (8.0cm)

050-100

3.2" (8.0cm)A

POWER AND

CONTROL

WIRING FROM

HUMIDIFIER

10-20 050-100

3.2”

(8 cm)

3. All SGH blower packs consist of a steel

cabinet containing: blower/motor powered by

voltage directly from the humidifier, fuse, relay,

speed select switch, stainless steel steam

distributor, supply air grille with adjustable

louvers, and built-in manual reset safety

thermostat to turn off the humidifier if the

blower pack gets overheated. Control

thermostat, mounted on the steam distributor,

starts the fan when steam is generated. When

supply voltage differs from voltage required to

run blower motor, blower pack will contain a

proper transformer. All blower packs provide

intake air filters.

4. Refer to Figure #6 for overhead and frontal

clearances required for blower packs.

Minimum clearance for the sides of the

Blower Pack unit is 12 inches. Dimensions

apply to both built-on and remote-mounted

versions of blower packs.

5. Mount remote blower pack(s) using factory

supplied wall mounting bracket, see Figure #5,

with clearance as recommended in Figure #6.

6. Steam distributor on the built-on and remote

blower packs have a hot surface that could

result in burns if touched. If space allows, we

recommend mounting at least 8 feet above the

floor.

7. Do not use blower packs as ducted blowers.

The air volume from a blower pack is not

sufficient to absorb the steam generated.

8.8. Pipe the steam line as stated in the STEAM

LINE section on page 6.

SGH

Model Min.

Number

of Blower

Packs

Min. Overhead

Clearance

inches (cm)

Min. Front

Clearance

inches (cm)

010 1 18 (45) 30 (76)

020 1 18 (45) 36 (91)

050 1 36 (91) 84 (213)

100 1 48 (122) 156 (396)

200 2 42 (122) 156 (396)

*Remote mounted only. Four remote mounted blower

packs are recommended on the 200 model.

Nominal conditions 72ºF, 35% RH.

STEAM DISTRIBUTORS

1. Each cylinder requires its own steam line

and at least one distributor (do not join two

or more cylinders to one larger steam line).

Any cylinder’s steam line may be divided into

multiple branches to feed more than one

distributor. Steam supply line “tees”are

common copper fittings that are available for

this purpose.

2. Steam distributor locations are typically as

follows: supply air duct, return air duct, air

handling unit. Proper location should

consider: air temperature, relative humidity

before the distributor, air velocity, dimensions

of the location, amount of steam being

introduced into the duct, downstream

obstructions, and surfaces vulnerable to

wetting.

3. When steam distributors are located in a duct,

they should be in a straight section of duct at

least 6 feet (2 meters) from any elbow or

obstruction. If the duct or plenum conditions

result in poor absorption distance

characteristics, please consult your local

representative or the factory. See Figure #7.

4. Steam distributors should always span the

width of the air stream. Multiple steam

distributors, arranged in a bank, can

minimize absorption distance.

-3-

See Figure #6 for mounting clearances.

Figure #6

Overhead and Frontal Clearances for Blower

Packs

Figure #5

Remote Mounted Blower Packs (SGBP)

5. Exercise extreme caution when installing in

fiber glass or internally lined ducts.

6. High positive or negative static pressure ducts

or plenums have special requirements. High

positive static pressure ducts may require the

unit to be fitted with a fill cup extension kit.

High negative static pressure ducts will likely

require the drain rate of the humidifier to be

increased to compensate for the reduced

drainage caused by the suction.

7. Vertical downflow ducts may induce an

artificial static pressure necessitating a fill cup

extension kit.

8. Low temperature ducts below 60 F (15 C),

shallow ducts, or branch ducts might require

the use of a field supplied condensate drain

pan below the steam distributor. See Figure

#8.

9. The steam distributor mounting plate is

perpendicular to the steam distributor. When

the mounting plate is attached to the side of

the duct, the distributor is level. An upward or

downward slope to the distributor will result in

poor condensate drainage and “spitting”of

condensate in duct. See Figure #9.

-4-

SHALLOW DUCT

DRAIN PAN

T-BAR CEILING TO DRAIN

BRANCH DUCT

Figure #8

Condensate Drain Pan

Wrong

Support

(If Needed) Correct

Always

Mount

Level

Wrong

Figure #9

Leveling Distributor

3/8" Threaded Rod

(Field Supplied)

Hex Nut

Factory Attache

Steam Distributor

Duct

Figure #10

Distributor Support

1. 2. 3.

1. Steam Distributor Mounting Plate

2. Cut Hole In Duct For Insertion Using Template

3. Mount With Four Sheet Metal Screws

Figure #11

Cutting Duct for Mounting

Min.

Mount Steam Distributor

At Least 6' (2 M) From Elbow

Multiple Steam Distributors

Can Reduce This Distance

Figure #7

Steam Distributor Location

10. Any distributor longer than 3 feet (1 meter)

should be supported at its end with a threaded

rod through top or bottom of duct. See Figure

#10.

11. It is recommended that single distributors are

mounted near the bottom of the duct to ensure

the steam is dispersed into the majority of the

air flow. See Figure #12.

12. Using duct mounting template provided, cut a

hole in side of duct just large enough to admit

steam manifold and condensate drain pipe

assembly. Use four sheet metal screws to

attach mounting plate to side of duct. See

Figure #11 and #12.

13. With multiple steam distributors, the top steam

distributor should be at least 8" below top of

duct to avoid possible condensation on

surface of duct. The remainder of space

below is proportioned accordingly. See Figure

#14. For short steam absorption systems see

Figure #13.

PLUMBING

All water supply and drain line connections

should be installed in accordance with local

plumbing codes.

WATER SUPPLY LINE

1. Humidifier is intended to operate on potable

(cold) tap water.

2. If the raw water is very hard, Liebert can

provide longer cylinder life on softened water.

However, softened water is more conductive

and more corrosive. Some hardware and/or

software changes may be required, at time of

order or in the field. Consult local

representative.

3. DO NOT use a hot water supply to humidifier.

Minerals will adhere more easily to surfaces

and the fill valve’s small flow regulating orifice

could become plugged.

4. Standard fill valves are sized for water

pressure ranging from 30 to 150 psig. For

other pressures, consult local representative.

This pressure should be measured at the

humidifier if the water pressure is suspect.

-5-

MIN. H = 16"

1/3 1/31/3

2/5

1/5

Min. W = 12"

4" 4"4"

H 20"

W 17"

Figure #14

Multiple Steam Distributors for Better Mixing

Figure #12

Single Steam Distributor Installation

8" Steam Header

Figure #13

Multiple Steam Distributors

5. ALWAYS supply and install a shut off valve in

the water supply line dedicated to the

humidifier to facilitate servicing. Use ½"OD

copper to within 4 feet of the humidifier.

Reduce copper to 3/8" OD and connect to the

factory-supplied 3/8" olive compression fitting

under the humidifier.

DRAIN LINE

1. Humidifier is equipped with a 7/8" O.D.

unthreaded drain outlet on underside of drain

canal on bottom of the humidifier (see Figure

#15). A supplied reducer (see Figure #16)or

equivalent shall be installed on the drain line.

It will prevent backup in the drain pan and in

the cylinder due to partially blocked or badly

installed drain lines. This prevents rusting of

the drain pan and arcing due to

over-concentration. The drain canal has been

improved to prevent backup despite long or

gently sloped drain lines but it can not

compensate for flat or uphill runs.

2. The drain line should not end in a sink used

frequently by personnel, or where plumbing

codes prohibit it. Route to a floor drain or

equivalent for safety reasons, since drain

water from humidifier can be very hot.

3. Keep drain lines as short as possible. Keep

drain lines sloped down, not level and not

up since low spots in drain lines will

accumulate sediment and cause backup.

The drain line should be 1" O.D. copper pipe

or larger. Do not use plastic pipe for drain

lines.

STEAM LINE

1.1. Steam lines for SGH models 010 through 020

require a minimum 7/8" O.D. (nominal 3/4")

copper pipe. For steam runs longer than 20 ft

use insulated nominal 1" copper to ensure the

draining of condensate.

2. Field-supplied hard copper with ½" thick

snap-on insulation is recommended for

steam supply, with Liebert supplied steam

hose coupling used to make connection to

cylinder. See Figure #17.

-6-

Factory Supplied

Tapered cut is

recommended

3/4” Copper Pipe

(Not Supplied)

Copper Reducer

(1 1/4” - 3/4”) To

Serve As Funnel

Drain. Factory

supplied.

Air Gap

NOTE: Steam hose should not reach bottom of the funnel.

In the event the building drain is plugged this becomes an

overflow

oint.

ClampAnd

7/8" I.D. Hose

Figure #16

MODEL A in. (mm) B in. (Mm)

010-020 1.0 (25) 5.0 (127)

050-100 2.2 (55) 6.2 (158)

200 LEFT 2.2 (55) 6.2 (158)

200 RIGHT 2.2

(

)

19.6

(

498

)

Wall

Bottom View

Figure #15

Drain Line Connection

Trap

See Section On

Condensate

Return Line

Field Supplied

Insulated Hard

Copper Pipe

Or Flexible

Steam Hose

Available

From Factory

Clamp To Steam Distributor

Or Remote Blower Pack

Figure #17

Steam Line Connection

Min. 12"

Min. 10 Degree Slope

Trap

* See Section On

Condensate

Return Line

NOTE: Trap must be 3' minimum down from steam distributor.

If not, condensate must be routed to drain.

Figure #18

Sloping the Steam Line

3. Liebert steam supply hose or field-supplied

piping should be sloped downwards from the

steam distributors to the humidifier. Slope

should be at least 2" in 12" to promote

condensate runback. See Figure #18. If this

slope is not possible, condensate must be

removed before the distributor. See Figure

#19.

4. Minimize the length of steam line and keep it

as straight as possible, minimizing bends.

Also, avoid using 90 elbows. Wherever

possible, use long radius turns (using tube

bender on oversized copper or pairs of 45

elbows). This will reduce the condensate

generated by heat loss. This will also reduce

the back pressure and avoid the need to

buy/install an accessory Fill Cup Extension Kit.

See Figure #22.

5. Ensure that the steam hose does not kink or

sag. The steam hose becomes more flexible

when hot. The hose should be supported to

prevent water traps. Only use steam hose for

connections or steam lined runs of 5 feet or

less. See Figure #20.

6. To ensure odor-free steam, always use Liebert

steam hose. Check steam hose and hose

couplings periodically for cracks, breaks,

kinks. Replace as required. DO NOT

substitute hose. Liebert is not responsible for

health effects or damage from substitute hose.

7. Steam lines for SGH 050 through 200 require

1-5/8" O.D. (nominal 1-1/2") copper pipe. For

steam runs longer than 40 ft use insulated

nominal 2" copper to ensure the draining of

condensate.

8. Do not use steel or plastic pipe for steam

distribution, or hose other than Liebert

supplied. Substitution will void warranty.

9. If steam line is routed below steam distributor

or if the steam distributor is lower than the

humidifier, a condensate trap ‘tee’will be

required to remove water at this low point.

Run condensate from trap to nearest drain

lower than the distributor. See Figure #21.

10. All built-on blower packs are factory-fitted with

all steam hose connections. No further work

is required.

11. Do not run steam line more than 1 foot per

lb/hr output. Example, 10 lbs/hr should not

have a steam run longer than 10 feet. If long

runs are unavoidable, the humidifier should be

sized larger to compensate for condensate

losses and insulated copper should definitely

be used.

-7-

Condensate To Drain

Figure #19

Long Steam Lines

AVOID WATER TRAPS

AVOID KINKS

PROPER

SLOPE

GENTLE

SWEEPING

TURNS

Figure #20

Steam Hose Routing

NOT ACCEPTABLE

WITHOUT TRAP "TEE"

HUMIDIFIER

OBSTRUCTION DUCT

CONDENSATE "TEE"

AT LOW POINT IN

STEAM HOSE

CONSULT FACTORY

TO FLOOR

DRAIN

CREATE A FALSE LOW POINT TO REMOVE

CONDENSATE WHENEVER THE

STEAM LINE MUST APPROACH THE

DISTRIBUTOR FROM ABOVE.

Figure #21

Condensate Tee at any Low Point in Steam Line

ACCESSORIES - FILL CUP EXTENSION KIT(S)

1. The SGH humidifier is an electrode humidifier.

It produces steam at atmospheric pressure.

Pressure head must develop to push steam

through supply line and into air duct.

2. Combined resistance of duct positive static

pressure and steam line resistance creates a

small pressure head in steam cylinder. Total

amount of positive static pressure head is

reflected directly by water column differential

that develops between water in the fill cup

hose feeding cylinder and water level in

cylinder.

3. Standard dimensions of humidifier limit static

that can be tolerated before water will be

pushed high enough to spill over into overflow

tube in fill cup assembly.

4. To increase allowable water column (allowable

positive static pressure) an accessory Fill Cup

Extension Kit is available from Liebert. See

Figure #22.

CONDENSATE RETURN LINE

1. Each steam distributor has a built-in

condensate return (3/8" O.D. copper tubing).

Flexible condensate return hose (3/8" I.D.)

available from Liebert, is recommended for

routing condensate back into humidifier’s fill

cup. Note: A short length of 3/8" O.D. copper

tubing is supplied by Liebert for use when

routing condensate hose back to humidifier’s

fill cup. Similarly, a short length of 3/8" I.D.

condensate hose with clamps is supplied with

Liebert’s steam distributors to serve as a

flexible coupling. DO NOT direct solder field

copper condensate line to steam distributors.

2. Always incorporate a trap in routing of

condensate return line. Condensate that

accumulates in trap will prevent possibility of

steam escaping. Depth of trap must exceed

duct static pressure by 2 inches of water

column. See Figure #23.

3. Condensate return line can not be run back to

fill cup if humidifier is within 36" of being level

with steam distributor. See Figure #18.

4. If steam distributor is mounted level with or

below humidifier, condensate line must be

routed to nearest floor drain or to a

condensate pump (available from Liebert).

See Figure #24.

5. Provide a “U”trap in condensate line even

when distributor is located in return air

plenum. It stops a suction action from

-8-

TRAP

3 FEET MINIMUM

CONDENSATE TRAP

DEPTH OF TRAP

MUST BE 2" MORE THAN

DUCT STATIC PRESSURE

OF WATER COLUMN

Figure #23

Trap to Prevent Steam in Condensate Line

HOSEFROMFILLVALVE

FILLCUP BRACKET

FILLCUP

OVERFLOWHOSE

FILL HOSE TO

CYLINDER

Figure #22

Fill Cup Extension Kit to Overcome Static Pressure

Humidifier

Drain Line

Drain

Pump

Floor

Surface

Line

Figure #24

Drain Pump (if necessary)

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