Dryers are needed in ail pneumatic systethe air consumption of the system. The unit isthe compressor and the controlled devices (Fi~jgh~press~re (upstream) side of the PressurValve (PM/).

H E A T - E X C H A N G E RHOT GASBYPASS

REFRIGERANT

S~~ARAT~R/AUT~~AT~~ DRAIN

VALID ~KN8~~~, HKN8010, HKNBcl15, AND HKN8210 MODELS. S~~ARATDDED TO LARGER MODELS IN THE FIELD IF R~~Ul~~~..

205362

ryer Schematic Drawing.

with the outlet dewpoint at 35F (2C), the inlet pressure at 100 psi (689 kPa), the inlet

(689 kPa) ur inlet temperatures below lOOF (38C), the 5ryer can handle more than the rated flow. At lowerinlet pressures or hi her inlet temperatures, the Dryer cannot and/e the rated flow.

alent to ~~~~005 with prepiped RV and filter station.

** “These models are rate at 3 scfm (1.34 I/s) with PP902A or set for 18 psi (124 kPa) outlet pressure.

tt HKN8210 is equivalent to HKN8010 with prepiped PRV and filter station.

I

m

mbient temperature: II 1 OF (436)Inlet Air temperatures I2OF (496) The Dryer removes moisture from compressed air by

lowering the air temperature to reduce the ability of the air to*e

1-l ~/208/23OV ac, 60

Ie60 to 150 psi (414 to 1034 kPa) (Standard Dryer)

hold water vapor. Water condensed from the air is removedby mechanical action in the separator/drain, then dischargedfrom the system through an automatic drain. Contaminants inthe compressed air are partially removed by an in-depth typefilter in the separator/drain, then final filtered by the high-efficiency, submicron, coalescing filter.

The PRV reduces the clean, dry, compressed air to thepressure required by the control system. In two-pressuresystems ~day/night or heating/cooling), the PRV furnisheseither of two control pressures. Switchover from one pressureto the other is from an external two-position pneumatic orelectric switch.

85-0086

e sure that, when ail valves, dampers, relays, or otherposition on power failure,

refu~ly study the jobr compressor or air

TE: II controls in the refrigeration section are factory setand are not field adjustable.

caps can be weakened or dissolved by certain oils, chemicals, household cleaners,

Use a soft cloth or brush to clean dirt from the refrigerationcondenser coil to allow free passage of air. The condensermay be blown clean with compressed air or, if heavilycontaminated, washed with mild detergent and water. Inpafiicularly dirty areas, install a furnace-type filter pad in fronof the refrigeration condenser. If a filter pad is ~~sta~~ed, itmust be changed regularly to enable airflow across thecondenser coil.

attack mineral-filmed nylon. See the list of materials in Table 1.

Boron ~rifluoride

Chioracetic Acid

~hiorosulfonic Acid phosphoric Acid (25%)Potassium

thylene ~h~orhydr~~

ilter e~ern~~t replace ent is recommended if pressure dropacross the alit exceeds 18 psi (69 kPa). See REPAlR for this

3 85-0086

o~y~arbo~at~ plastic bowls can be weakened or dissolved by certain oils, chemicals, household cleaners, paints, and fumeswhich attack polycarbonate plastic. Do not use the materials in Table 2 or allow them to come in contact with polycarbonatebowls. Use a metal replacement bowl if one of these materials cannot be avoided.

Table 2. Polycarbonate Bowl Chemical Resistance.

Formic Acid (Cone)~~trobenzene~itro~ellulose Lacquer

BromobenzenePhosphorous Hydroxy Chloride

Carbon Tetrachloride Phosphorous TrichlorideCarbon Disulfide Propionic Acid

Sodium SulfideCaustic Potash

Sulfuryl Chloride

* Phosphate ester lubricants. Where compressor lubricants other than mineral-base lubricants are used, contactl~br~~a~t manufacturer.

Po~y~arbo~ate bowis must be cleaned with a mild householddetergent. Take care to avoid exposure to the chemicalslisted in Table 2, which may be present in the compressed airsystem, in the ambient air surrounding the bowl, or incleating solvents.

During operation the filter cartridge reaches equilibrium whenthe amount of liquid Gontained in the influent air equals the

eing permanently removed from the air. Atthis point, the filter cartridge at equilibrium is said to besaturated. At rated flow conditions, equilibrium pressure dropwill Norman e in the 3 to 4 psi (21 to 28 kPa) range for light

4 to 5 psi (28 to 34 kPa) for moderate loading,(34 to 41 kPa) for heavy loading. Further

pressure drop occurs only as the cartridge becomescontaminated with solid particles.

For maximum filtration efficiency, replace the filter cartridge ifthe pressure drop across the unit exceeds 10 psi (69 kPa).

orma~ly this value is the difference between the compressorstorage-tank gage indication and the PRV high-pressuregage indications

When flow is interrupted for several hours, the pressure dropmay temporarily increase upon the resumption of flow. Thisincrease is due to a change in the viscosity of the residualliquids in the cartridge from the temperature change. Thepressure drop normally returns to a value approaching what itwas prior to flow stoppage within one hour and does notrequire flanging the fitter.

During normal operation, the lower part of the outer foamcover becomes discolored in a band. Any spotting above theband indicates that the foam is accumulating liquids fasterthan it can be drained and that an excessive amount ofliquid is present in the incoming air. For filter replacement,see REPAIR.

ryer

Check the red (high temperature warning) and green (power)lights on the front of unit. In normal operation only the greenlight is on. The red light indicates that the temperature of thecompressed air leaving the heat exchanger (Fig. I) is higherthan normal (see T~OU~~~SH~~TI~G). The red light turnsoff about 15 minutes after start-up.

Check condensate discharge tube for signs of moisturedischarge. This may take several hours after start up.

85-0086 4

5

he refrigeration section cannot be field repaired.et~rfl it to the factory for repair.

o~~owi~g sections describe the various repair~ro~edur~s*

cedure is used to manually drain the separator bowl

-I. emove the metal clamp and tubing from the knurledfitting (Fig. 2).

2. Turn the knurled fitting clockwise to open.

revent tearing filter sleeve, turn knurled fittingslowly. This prevents sudden pressure changes in theseparator/dra~~ lousing,

pressurization is finished, turn the knurled fittingiockwise to close.e tubjng and metal clamp.

URN c TURN CLOCKWISE

METAL CLAMP

TUBING

c3:09

Fig. 2. Separator/Drai~ Bowl Showing Knurled Fitting.

To place system in bypass mode:

Remove Locking Pin (Fig. 3) from movable spool, endlabeled PUSH TO BYPASS.Push movable spool from same end until movablespool is flush with body of valve. Compressed air nowbypasses the Dryer and the Dryer is automaticallydepressurized.Insert Locking Pin in movable spool on end labeledPUSH TO DRY.

To return to normal operation:

Remove Locking Pin (Fig. 3) from movable spool, endlabeled PUSH TO DRY.Push movable spool from same end until movablespool is flush with body of valve. Compressed air nowflows through the Dryer.Insert Locking Pin in movable spool on end labeledPUSH TO BYPASS,

4

AIR DRYER

-

AIR DRYER

MOVABLE SPOOL

LOCKING PIN

FROM COMPRESSOR

TO SYSTEM

+ “PUSH TO DRY” LABEL

ORMAL MODE

“PUSH TO BY PASS” LABEL

FROM COMPRESSOR

TO SYSTEM

LOCKING PIN

Fig. 3. Airflow through Bypass Valve.

hese procedures are used to isolate the Dryer fromthe system.

nd outlet valves.s valve.

arate Bypass and Isolationharvest

1.

2.

3.

4.5”6*

7.

em and depressurize

m using the applicable

For maximum filtration eff~c~e~cy~ replace the filter sleevewhen pressure drop across unit excee

1.

2.

3.4.5.

6.

7.8.9.

-lo.

Isolate the Dyer from the em alp e~ressur~~eproce e from

the sepa~ator/dra~~bowl to the filter head and ~~~~ve ~~~~ and collar.Clean ~o~ycar~o~ateRemove wing nut anSlide dispcsa~~e fiitecore.If separator core is di~y, unscrew from filter headand clean with soap an

or sleeve sealbrig.

Slide new filter sfeeve ov

procedure from ISOL

M O D E L SHKN8070 AND

HKMBOi 00O N L Y SLEEVE SEAL

SEPARATOR -CORE

CARTRIDGEO-RING

e------ FILTERSLEEVE

/+---- BOTTOMCAP

1- ---_-p - - - ; - - - - - T O R E M O T E A L A R M

stem and depressurizee procedure from

) holding the separator/drain

ilter element with top and

ter element and gaskets.

Ff LTER HEAD

TOP GASKET

COLLAR

FILTER ELEMENT

FAN SWITCH OMITTED ON MODELS HKN8010 AND HKN8210

20539-2

Fig. 7. Schematic for H KHKN801 5, HKN8025,

BOTTOM GASKET

___ WING NUT

BOWLHIGH TEMWARNING

‘---;:---_-_-: TO REMOTE ALARM

r--FAN SWITCH

20538-I

icron).GROUND

CAPACITOR L---A COMPkt-SSORTERMINALS

20540

‘----;------Z-Z TO REMOTE ALARM

OVERLOAD

GROUND

START CAPACITOR 20541

matic forQO 115/l

70 anders

COMPRESSED AIR DRYERS (~A Safe

Replacing the Bypass Valve

TERMINAL COVER

OVERLOAD

OVERLOAD LEADSCREW

RELAY LEAD

BALE STRAPOVERLOAD TENSION SPRING7

COMMONSTARTRUN

TWO CONDUCTOR FAN CORD20542

Fig. 10. Overload and Compressor Relay Detail.

AWARNINGBe sure that, when ail valves, dampers, relays, or otherdevices return to their normal position on power failure,a safe condition will exist. Carefully study the jobdrawings before turning off air compressor or airsupply valve.

To replace bypass valve (Fig. 1):

I . Depressurize system by shutting off compressor orclosing valve on outlet of compressor tank.

2. Loosen fittings”3. Replace valve.4. Tighten fittings.5. Pressurize system and check for leaks.

Replacing the PRV Filter StatiQn

Filter Element Replacement Kit 14004209 is used to replacethe filter element in the PRV filter station on the HKN8005and HKN8210 Dryers. Replacement procedures are packedwith the kit.

9 85-0086

Ior pat-a ~~~~~r~.

FRONT VIEW COMPRESSOR --________ POWER CORD

RIGHT SIDE VIEW

ryer Repair Parts I-ocations.

02 Metal Bowl HKNO3708304HKN03708008HKN03708505HKN03708705HKN03709607HKN03710105

HKN07444101HKN07444201HKN07444301HKN07444401

HKN44600793

N8025, and HKN8210N8070, and HKN80100

8025, and HKN8035

HKN03051001HKN34100001

HKN44604363HKN44604364

10

8

-

Hone_ywellHome and Building Control Home and Building ControlHoneywell Inc. Honeywell Limited-Honeywell LimitkeHoneywell Plaza 740 Ellesmere RoadP.0. Box 524 Scarborough, OntarioMinneapolis, MN 55408-0524 MlP 2V9

Helping You Control Your World

85-0086 Rev. 5-94