Liebert Blowtorch SL 14050 User Manual

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

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3. Report any discrepancy immediately.

INSTALLATION

BASIC HUMIDIFIER CONFIGURATION

RECEIVING & UNPACKING EQUIPMENT

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.

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.

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.

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.

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.

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).

Figure #2

Clearance Requirements

Figure #1

SGH Series Humidifier

WALL

Condensate

Return

Steam

Outlet

WITHOUT BLOWER PACK

TOP VIEW

MIN. 36"SIDE

CLEARANCE

RECOMMENDED.

SEENOTE.

NOTE: LOCAL AND NATIONAL

CODES MAY DEVIATE. PLEASE

CONSULT APPLICABLE CODES

FOR CLEARANCE REQUIREMENTS

IN ALL CASES.

MIN. 36"

FRONTAL

CLEARANCE.

Power And

Control

Wiring

Nameplate

Label

Drain

Water

Supply

LOCATION & MOUNTING

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.

HUMIDIFIERS

SGH humidifiers are designed to mount on a

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

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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.

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.

1. Location of the humidifier should be below and

as close as possible to the steam distributor

location as possible.

8. If humidifiers are mounted on roof, a

thermostatically ventilated weatherproof

cabinet by others should be used. Consult

factory.

2. For front and side clearance requirements (for

access during installation, maintenance and

troubleshooting), see Figure #2.

9. DO NOT mount humidifiers in an area where

freezing may occur.

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.

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.

4. Where possible, mount humidifier at a height

convenient for servicing.

Figure #4

Built On Blower Pack

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.

Built-In

Supply Air

Grille

Optional

Built-On

Blower Pack

Built-In Steam

Distributor

Single

Circuit

Humidifier

Figure #3

Wall Bracket Mounting Detail

WALL

7.7”

(19.6 cm)

FASTENWALLBRACKET

(FACTORYSUPPLIED)TO

WALLUSING ANCHORBOLTS

(3) SUPPLIEDBYOTHERS

Power And

Control

Wiring

See Figure #6 for mounting clearances.

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).

005-030

050-200

7.7"(19.6cm) 7.7"(19.6cm)

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Figure #5

Figure #6

Overhead and Frontal Clearances for Blower

Packs

Remote Mounted Blower Packs (SGBP)

WALL

SIDE

FRONT

SGH

Model

Min.

Min. Overhead

Clearance

Min. Front

Clearance

inches (cm)

3.2”

_{(8 cm}A₎

Number

of Blower inches (cm)

Packs

010

020

050

100

200

18 (45)

36 (91)

48 (122)

42 (122)

30 (76)

36 (91)

POWER AND

CONTROL

CONDENSATE

STEAM

WIRING FROM

HUMIDIFIER

84 (213)

156 (396)

005-030

10-20

050-100

See Figure #6 for mounting clearances.

3.2" (8.0cm) 3.2" (8.0cm)

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.

*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.

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.

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.

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.

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

7. Do not use blower packs as ducted blowers.

The air volume from a blower pack is not

sufficient to absorb the steam generated.

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.

8. Pipe the steam line as stated in the STEAM

LINE section on page 6.

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Figure #7

Steam Distributor Location

downward slope to the distributor will result in

poor condensate drainage and “spitting” of

condensate in duct. See Figure #9.

Min.

Figure #9

Leveling Distributor

Min.

Wrong

Mount Steam Distributor

At Least 6' (2 M) From Elbow

Multiple Steam Distributors

Can Reduce This Distance

Support

(If Needed)

Correct

Always

Mount

Level

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.

Wrong

Figure #10

Distributor Support

7. Vertical downflow ducts may induce an

artificial static pressure necessitating a fill cup

extension kit.

3/8" Threaded Rod

(Field Supplied)

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.

Figure #8

Condensate Drain Pan

Hex Nut

Duct

Steam Distributor

Factory Attached

SHALLOW DUCT

DRAIN PAN

TO DRAIN

Figure #11

T-BAR CEILING

Cutting Duct for Mounting

BRANCH DUCT

DRAIN PAN

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

1. Steam Distributor Mounting Plate

2. Cut Hole In Duct For Insertion Using Template

3. Mount With Four Sheet Metal Screws

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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.

below is proportioned accordingly. See Figure

#14. For short steam absorption systems see

Figure #13.

Figure #14

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.

Multiple Steam Distributors for Better Mixing

MIN. H = 16"

Figure #12

Single Steam Distributor Installation

2/5

1/5

Min. W = 12"

H 20"

W 17"

1/3

PLUMBING

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.

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.

13. With multiple steam distributors, the top steam

distributor should be at least 8" below top of

duct to avoid possible condensation on

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

surface of duct. The remainder of space

Figure #13

Multiple Steam Distributors

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.

Steam Header

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.

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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.

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.

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

STEAM LINE

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.

over-concentration. The drain canal has been

improved to prevent backup despite long or

gently sloped drain lines but it can not

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.

compensate for flat or uphill runs.

Figure #15

Drain Line Connection

Figure #17

Steam Line Connection

Bottom View

Clamp To Steam Distributor

Or Remote Blower Pack

Field Supplied

Insulated Hard

Copper Pipe

Or Flexible

Steam Hose

See Section On

Available

Wall

Condensate

Trap

From Factory

Return Line

MODEL

010-020

050-100

200 LEFT

200 RIGHT

A in. (mm)

1.0 (25)

2.2 (55)

B in. (Mm)

5.0 (127)

6.2 (158)

19.6 (498)

Figure #16

Figure #18

Sloping the Steam Line

Min. 10 Degree Slope

FactorySupplied

Taperedcutis

recommended

ClampAnd

7/8"I.D. Hose

Air Gap

Min. 12"

Copper Reducer

(11/4”-3/4”)To

Serve AsFunnel

Drain. Factory

supplied.

Trap

* See Section On

Condensate

Return Line

3/4”Copper Pipe

(NotSupplied)

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

In the event the building drain is plugged this becomes an

overflow point.

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

frequently by personnel, or where plumbing

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

If not, condensate must be routed to drain.

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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.

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.

Figure #19

Long Steam Lines

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.

Condensate To Drain

Figure #21

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.

Condensate Tee at any Low Point in Steam Line

NOT ACCEPTABLE

WITHOUT TRAP "TEE"

DUCT

OBSTRUCTION

HUMIDIFIER

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.

TO FLOOR

CONDENSATE "TEE"

DRAIN

AT LOW POINT IN

STEAM HOSE

CONSULT FACTORY

CREATE A FALSE LOW POINT TO REMOVE

CONDENSATE WHENEVER THE

STEAM LINE MUST APPROACH THE

DISTRIBUTOR FROM ABOVE.

Figure #20

Steam Hose Routing

AVOID WATER TRAPS

AVOID KINKS

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.

PROPER

SLOPE

GENTLE

SWEEPING

TURNS

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ACCESSORIES - FILL CUP EXTENSION KIT(S)

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.

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. 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.

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.

Figure #23

Trap to Prevent Steam in Condensate Line

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.

3 FEET MINIMUM

TRAP

Figure #22

Fill Cup Extension Kit to Overcome Static Pressure

CONDENSATE TRAP

DEPTH OF TRAP

MUST BE 2" MORE THAN

DUCT STATIC PRESSURE

OF WATER COLUMN

FILL CUP BRACKET

FILL CUP

OVERFLOWHOSE

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.

HOSEFROMFILLVALVE

FILL HOSE TO

CYLINDER

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.

Figure #24

Drain Pump (if necessary)

Humidifier

CONDENSATE RETURN LINE

Drain 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.

Line

Drain

Pump

Floor

Surface

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

when distributor is located in return air

plenum. It stops a suction action from

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impeding condensate flow when duct

pressures are below atmosphere.

on the steam distributor, starts the fan when

steam is generated.

6. The condensate line can go to either of two

large holes in the fill cup cover on top of

humidifier.

3. All blower packs have high efficiency blowers

to minimize the frontal and overhead

clearance required to absorb the steam.

7. It is not necessary to return the condensate to

the humidifier.

4. All built-on blower packs are factory wired to

humidifier. Primary voltage wiring to

humidifier, as described in electrical primary

voltage supply wiring, is all that is required to

power humidifier and blower packs.

8. Long condensate runs (more than twenty feet)

should be sloped well and be constructed out

of ½" nominal copper pipe to ensure flow.

5. Remote mounted blower packs require field

wiring between two primary voltage terminal

blocks and two low voltage control (class 1

circuit wiring required) terminal strips; one of

each located in humidifier and remote blower

pack cabinet. To properly access the primary

block on the humidifier, it may be necessary to

remove the side. To connect the primary and

control (class 1 circuit wiring required) wiring,

the wiring is fed through the knockouts

ELECTRICAL

PRIMARY VOLTAGE SUPPLY WIRING TO

HUMIDIFIER

1. Check and ensure that available voltage and

phase corresponds with operating voltage and

phase of humidifier as indicated on the

humidifier nameplate label (see Figure #1).

provided in the bottom of the blower pack.

The terminal block and strip are accessed by

removing the blower pack cover.

2. Ensure that an adequate power supply is

available to carry full humidifier amperage

drawn as specified by rated amps on the

humidifier nameplate label refer to local codes.

6. Field wiring of remote blower packs must

conform to national and local electrical codes.

Refer to wiring diagram supplied inside the

humidifier.

3. A dedicated external disconnect must be

installed. Do not exceed the maximum circuit

protection amps as indicated on the

nameplate label.

7. Use approved wire for power connection from

two pole terminal block of remote blower pack

to additional two pole terminal block inside

electrical section of humidifier.

4. Connect ground wire to cabinet ground clamp.

Do not use neutral wire of four wire supply as

ground.

8. Use approved wire to connect from ground

clamp of remote mounted blower pack to

ground clamp provided in the electrical section

of humidifier.

5. Single phase humidifiers may be run on three

phase power, but load may unbalance power

grid.

LOW VOLTAGE CONTROL WIRING

On-Off Controls

6. External wiring sizes must be in accordance

with NEC and/or CEC and existing local

electrical codes and by-laws.

Figure #25

External Wiring of On/Off Controls

PRIMARY VOLTAGE SUPPLY WIRING FROM

HUMIDIFIER(S) TO BLOWER PACKS

1. All blower packs are wired (by factory if

built-on, by others if remote mounted) to be

powered from the humidifier.

EXTERNAL

INTERNAL

2. As a safety feature, blower packs come

equipped with a manual reset safety

thermostat and relay built into the blower pack

cabinet. The manual reset thermostat turns

off the humidifier if the blower pack gets

overheated. The control thermostat, mounted

Controls are available from Liebert as accessories.

If controls were not ordered with humidifier, they must

be purchased supplied by others. The following

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information is relevant to all controls, factory supplied

or otherwise.

or down stream from distributor. Mount it

where air’s humidity and temperature are

uniform and representative of spaces being

humidified.

A, B and C (described below) are to be wired in

series (only one path for current) across terminals 8

and 10 on the low voltage control terminal strip, or

replaced with a jumper wire for constant operation

(see Figure #27). Caution: If any control field wiring

touches ground metal unit, safeties will be bypassed.

3. Mount duct high limit humidistat

downstream of steam distributors far enough

that, under normal humidity and air flow

conditions, steam will have been fully

absorbed (typically at least 10 feet). It must

be located to sense high humidity only when

uniform and representative air is

A - Wall or Duct Mounted Control On/Off

Humidistat: Wired to make on drop in humidity, break

on rise to setpoint. Set to desired % RH. Can be a

make/break set of contacts from a Building Automation

System.

over-humidified or approaching saturation.

4. Mount duct air-proving switch so that it is

able to sense air flow or lack of it. Wire it to

make when air flow is sensed and break when

air flow fails. Mount prior to distributor.

B - Duct Mounted Safety High Limit On/Off

Humidistat (if used): Wired to make on drop in

humidity, break on rise to safety setpoint. Set to

approximately 85% RH as a safety to help prevent

saturation and wetting in the duct.

5. Check operation of all on/off controls before

starting humidifier.

C - Duct Mounted Safety Air-Proving On/Off

Switch (if used): Wired to make when sensing air

flow, break when no air flow. Used as a safety to

prevent saturation when no air flow.

6. Calibration of controls (on/off or modulation) in

the field may be necessary due to shipping

and handling. Verify humidistat accuracy

before commissioning system.

1. Liebert offers various versions of A, B and C to

suit each application. In general, A is

essential, whereas B and C are highly

recommended in ducted applications.

OPTIONAL MODULATION (CONTINUOUS

CONTROLS) (see Figure #28)

1. Read on/off controls section first since it is

necessary to all control systems.

2. Field wiring from humidistat to humidifier and

between devices should be 18 AWG or

heavier and kept as short as possible.

2. Virtually any modulation (continuous control)

external hardware by others (as long as it has

%RH setpoint circuitry) may be interfaced with

pre-specified factory-configured SGH pc

board via the control terminal strip.

3. Low voltage control terminal strips are

provided in the electrical compartment.

Internal sides are factory wired. External

sides are to be field wired.

3. Modulation (continuous control) by others for

use with SGH humidifiers involves one of

several control wiring diagrams. In all cases,

modulating signal interfaces through control

terminal strip to main pc board inside

humidifier.

4. Each humidifier is supplied with a wiring

diagram inside.

CONTROL INSTALLATION

Figure #26

Typical Modulation Wiring

1. Mount any wall humidistat (control or high

limit) over standard electrical box at height

similar to typical thermostat. Any wall

humidistat should be in location

VariesWithEach

ModulationOption

SeeLiebertSupplied

ExternalWiringDiagram

representative of overall space being

humidified and not in path of blower pack or

air supply grille. Do not mount on a outside

wall where temperature fluctuation can affect

control response.

External

2. Mount duct humidistat in location

32 30

representative of overall air humidity, usually

return duct. Do not mount it directly in front of

steam distributor or in turbulent or mixing zone

Internal

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4. The modulation signal must increase from

minimum toward maximum as sensed RH

(actual RH) drops below desired RH (%RH

setpoint). In response, humidifier’s steam

output will increase from minimum toward

maximum. When humidifier’s steam output

(lbs/hr) matches humidification load (lbs/hr),

modulation signal will stabilize.

and the humidifier starts its operation. The controller

waits 10 seconds before energizing the on-board

relays. When the relays energize, heating voltage is

delivered to the cylinder. After a 30 second delay, the

fill valve is activated (if the output from the cylinder is

below 100 %). If controller detects increase of

amperage above allowed range, the unit will activate

drain valve for 2 seconds.

5. Field-wiring connections for modulation control

are to be made to external side of terminals 30

and 32 on humidifier’s control terminal strip.

Always refer to the external control’s wiring

diagram factory supplied with each Liebert

modulation control option.

During operation, the controller measures the rate

at which water is converted to steam and thus the

mineral content of water inside the cylinder. When this

rate exceeds the design optimum, a drain of the

cylinder takes place. The amount of water drained is

just enough to keep the contained water at design

levels.

6. Varying dc Voltage Modulation Signal

factory configured to accept the following vdc

signals: 0-10 vdc, or 2-10 vdc. Wire

according to Liebert supplied external wiring

diagram that comes with each modulation

option. To share the signal with more than

one humidifier, wire in parallel to each

humidifier. If a different signal is desired

consult factory.

During start up, when mineral content in the water

is low, water will reach the top of the cylinder at which

point the yellow indicator light will come on. This is

normal operation with a fresh cylinder. After a period of

time the water level will drop and the yellow light will

turn off.

High water level in the cylinder also indicates that

the cylinder is near the end of its service life as

electrodes become coated with minerals. The yellow

light coming on more often would be the first indication

of approaching the end of the cylinder life.

7. Varying dc milliAmp (mA) Modulation

Signal Powered by Others: SGH humidifier

can be factory-configured to accept a standard

dc mA signal, if pre-specified. Wire according

to Liebert supplied external wiring diagram

that comes with each modulation option.

Choose from 0-20 dc mA or 4-20 dc mA. To

share the signal with more than one humidifier

consult factory.

SGH OPERATION

END OF CYLINDER LIFE

When the cylinder is used up and water level can

no longer stabilize below full cylinder (due to fully

coated electrodes), the yellow light will flash in 4 pulse

cycles. At this time the control board interrupts steam

production and switches the green indicator lamp off.

The disposable cylinder must be replaced.

OPTIONAL MODULATION (CONTINUOUS

CONTROL) PACKAGES BY LIEBERT

Modulation (continuous control) “packages” are

offered as accessories by Liebert.

It is wise to keep a new replacement cylinder on

hand to avoid downtime when it becomes time to

change the disposable cylinder.

OPERATION

MANUAL CAPACITY ADJUSTMENT

On/Off Controls

INTRODUCTION

When the humidifier is first turned on, the

controller starts with a self test procedure, which takes

about 10 seconds. The test consists of activating for a

short time the drain valve, fill valve, and power relays.

The sound of the working solenoids is an indication of

valves operation. Green and yellow lights flash during

this time.

The SGH humidifier is rated in lbs/hr of steam

output capacity. Set to 100%, it will operate at full

output until the humidistat has sensed that the

humidity has reached setpoint. Then it will stop the

humidifier by breaking control circuit 8-10.

If the humidifier is oversized, the humidistat will be

quickly satisfied and stop the humidifier. As humidity

level drops the humidistat calls again. It is quickly

If there is no call for humidity, the humidifier is

standing by and green light flashes. When control loop

is closed ( Figure #13), the green light is steady on

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satisfied and stops again. The resultant short-cycling

is easily overcome.

using a screwdriver, press the reset button (marked

with a red dot) inside the blower packs.

A manual capacity adjustment potentiometer

(“pot”) is provided on the SGH main pc board for that

purpose. It is marked “CAPACITY ADJUST” and is

adjustable from 25 to 100% of rating.

Units are also equipped with speed select switch.

The switch is located on the right-hand side of the

blower, inside the blower pack. To access the switch,

remove right-hand side intake air filter.

Modulation Control

To avoid condensation on the cabinet parts, run

blower pack on high speed when humidifier delivers

more than 50 lbs/hr of steam.

The SGH humidifier, utilizing modulation control,

does not have the same problems of over sizing. It

reacts to the modulation signal and varies its capacity

automatically. However, if you wish to turn down the

capacity, use the manual capacity adjustment

potentiometer (“pot”).

OTHER POTENTIOMETERS

Do not adjust any other potentiometers (“pots”) on

the pc board(s). They are factory-set and not meant to

be user-set.

DETECTING WATER SUPPLY DEFICIENCY

Knowing how long it normally takes to fill each size

steam cylinder, each humidifier’s pc board is factory

configured to an acceptable maximum filling time. If it

is filling too slowly, when the time expires the

electronics stops the humidifier. To indicate this, the

green light goes out and the yellow light goes on.

REMOTE INDICATION

Every SGH comes factory wired as a set of dry

contacts at 61-20 on the control terminal strip. The

user can connect an indicator externally to 61-20. It

will automatically be activated any time a fault is

detected.

DOUBLE UNIT OPERATION

Turn both switches on. If there is a demand for

humidity, the green status lamp will indicate that the

circuit is operating.

BLOWER PACK OPERATION

Blower packs are equipped with a control

thermostat mounted on the steam distributor. As soon

as humidifier generates steam, the contact is closed

and the fan is started. When steam is no longer being

generated, the fan cuts out with a delay.

If blower packs get overheated (malfunction of the

air circulation), the manual reset safety thermostat

interrupts the steam generation. To reset, switch off

the humidifier and wait until the steam distributor cools

down. Then remove left-hand side intake air filter and,

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LIMITED WARRANTY

Liebert Corporation (hereinafter collectively referred to as THE COMPANY),

warrant for a period of two years from date of shipment, that THE COMPANY’s

manufactured and assembled products, not otherwise expressly warranted (with the

exception of the cylinder) are free from defects in material and workmanship. No

warranty is made against corrosion, deterioration, or suitability of substituted materials

used as a result of compliance with government regulations.

THE COMPANY’s obligations and liabilities under this warranty are limited to

furnishing replacement parts to the customer, F.O.B. THE COMPANY’s factory,

providing the defective part(s) is returned freight prepaid by the customer. Parts used

for repairs are warranted for the balance of the term of the warranty on the original

humidifier or 90 days, whichever is longer.

The warranties set forth herein are in lieu of all other warranties expressed or

implied by law. No liability whatsoever shall be attached to THE COMPANY until said

products have been paid for in full and then said liability shall be limited to the original

purchase price for the product. Any further warranty must be in writing, signed by an

officer of THE COMPANY.

THE COMPANY’s limited warranty on accessories, not of Liebert’s manufacture,

such as controls, humidistats, pumps, etc. is limited to the warranty of the original

equipment manufacturer from date of original shipment of humidifier.

THE COMPANY makes no warranty and assumes no liability unless the

equipment is installed in strict accordance with a copy of the catalog and installation

manual in effect at the date of purchase and by a contractor approved by THE

COMPANY to install such equipment.

THE COMPANY makes no warranty and assumes no liability whatsoever for

consequential damage or damage resulting directly from misapplication, incorrect sizing

or lack of proper maintenance of the equipment.

THE COMPANY retains the right to change the design, specification and

performance criteria of its products without notice or obligation.

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Model # :_________________________

Serial # :__________________________

Cylinder # :_________________________

Cylinder Last Replaced:

_________________________

MTH/DAY/YR

_________________________

MTH/DAY/YR

_________________________

MTH/DAY/YR

LIEBERT CORPORATION

1050 Dearborn Drive, P.O. Box 29186

Columbus, Ohio 43229

LR-35859

Listed

Humidifier

E65185

Tel: (614) 888-0246 • Fax: (614) 841-6882

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