Specifications

ManualsBrandsYork ManualsBlower480

5 25-N1

When the tcn]pertil ure III the corldlt]flned space tlws :ib~J\e

the thermostats c{}{)llrlgset p~~lnt.the thermosttit sends a

mt)dul~tmg w)lttige stgr)~lto tbe l(~gIcpane]. The therrnostat

slgnaI ISmoclltied b} J sign.11tIom t}le dIschJrge sensor,

which is mounted In the discll~fge air duct to protrde Qn-

twlpatlorl to the systcm TIIe logic p~nel responds to the

combmed tIwl mostJt cilsch,irgesensor signtil by activating

the nnnlrnum onwunl 01’c~xlllng to wtlsty’ the thertnostdt

demdnd.

Normal sequence 01 ~]pcra[I{>rlISas 1’(IIIows

1. Power ISsupphed to the un[t through the dIsc{Innect

swltch. The SJJltCII cJn be I’lelcl-installed <lr fsctory-ln -

stulled

as J n op[ l{)rl.

a As soon JS pt~weI is supphed t() the unit the cornpreSsor

‘...

CIankase hedters 1T} I [and 2TH) will be energized.

CX L’TI()’v”

D(J1101atte)tu)t I()start [iI(>cottrurcsw)rs\t’ilh-

(JI([(If [casrS hollrs OJo-at]kc,aseh t or CY)III-

pr<’w)rdat)la<ycltvli(wcur.

Tile system swItch on [he r(l~lnl tbermost:it or the stdtus

panel most be in the ALIT() or (’00[ posltlon to com-

plete the clrcult between the [erminti]s I I 9 and 103 R(.

On demand of the roon) thermt~st~t for coollng the

“COOI 1“ contacts on the logic panel close ond ener-

gl~es 1R COII.

An intern~l connect i~~nIII the thernmstat or status panel

ener.gi~esthe 7 R cod. 7R contact closesenerglzmg ~%1

coil. 3M contacts close, starting the supply air fan motor

After an adequate olr flow is est~blished, 5 LP closes to

energue 6R cml. 6R cont~ct closes in Ihe compI essor

con[rot CIIcult.

,}rOTf:’:The abotv opct-a[a)t)ISjbr itl[t~rtt)i[tctztjail oper-

atio)l. I’r)r(’(Jflfi/u((J//sf)p(’raffo}f,fiw JiIfISW’IILh

(MIthe roor?lt}wttlostat or [he s[atm pattcl hh(mki

be ttrat~uail~closed [I)ctlt>rgize

7R.

Relay c(mttict 1R CIOSCS~nd eneigl~es 1M CL)II,wluch

starts thc N’o. I compressor. At the same time, 4M is en-

ergized to start the condenser fans

If the room tenlperature continues to rise. the “COOI 2“

contacts on the lt~gicpane] close and energues 2R COII,

8, On the DS(’480 units the 2R contacts dose, energizing

the ?hl coil which st~rts the No. 2 compressor [~r~)n tie

DSC300 and DS(’360 units the 2R contacts close de-enel -

gI/Ing the compressor unloadlrlg solenold which lrxrdsthe

cornpresser.

The compressor sl]ort cycle time and low vo]t~ge ptotec-

tion IS part of the sohd st~te compressor protection mod-

ule. It prevents a compressor from starting unless it has

been off for five minutes, It also monitors the voltage of’

the 120 volt control circuit and will shut down the com-

pressor it’ the 120 volt control voltage drops below 85f4.5

volts.

T() mtilnt~lrl suff ]ctcnt head pressure during low ~rnblcnt

oper:ition condenwr ffin N(). i on the DS( ’300 unlt and

c(]nderlset Ltrl\ No. 1 and 2 on the 1)S(’.360 ~nd 1) S(’480

units WIII be de-energved b} 1T] I (we ‘l-uble ()) (-ondcn -

se] ton No. 2 on the DS(’300 unlt and condcn~cr f:ins N()

—

3 :tnd 4011 the DSC360 and DS(’480 urll(i WI1lbe de-cn-

etglzed by 2TI i (see Table 6).

UNIT

1TH 2TH

DSC300

---– 55 + 6“ F

25 + 6°F

———

DSC360 -

55 + 6<’F

25 + 6“ F

DSC480

55 + 6°F

35 + 6“ F

EXHAUST Al R SYSTEM

The e~haust :iil fans ~rc energized by manually clo~irlga clr-

CU1[between tel rnlnaIS60 and 64 of termlna 1block 2Tfl or

JLIt~)matLcallybe an end switch 011tIIC cc(In(JnII/e r dampcI

mot or. As tbe ecorlonli/cr daroper opens. it clt)$estIIe cnd

sw’ltch {m 1he darnpel mot (JI and [ UIn$ on t]Ic ekhaUS(aIr

lan> The degIee of blade opening ,it wllicli tile cxh,iu~t fan$

aIc enelgljed can be tidjusted by the foik)wing pIocedurc

IISC (he bltick scaleplate a~ an lndlcatot of nlotol” p(IsIl lon

fol $Wltch Opelat 100.

Ltloser) tile tIIumb nut and the can] k)cklng SCICWJ

Set the opel atl(]nll and dlffe Ient lal canl~.

(’heck switch acllu>tment by nN)v Ingthe adj(lst(]r 2 KI I to

Inove the motor. .Swltch should click when clcsmd make

~nd bIetik point\ JI c lined up w’}tII Inclex nl,il k tind tIIe

e,khdust ton should ~tart and \t op.

i~ILIR.I/,L’(;. 1~() ~(lj[ polt,c,t if (

otritc,ctcdro [k’ jtt[l(il

5. Tighten thumb nut.

SUPPLY AIR BLOWER ADJUSTMENT

Knowing the required CFM, [he unit optlonsl and tlie static

Ieslstances(~fhot h tlie S(Ippl} and tl~cIet urn au duct s>s-

tems, the RPhl toI the supply all blowcrj can be dc[ct nuned

f’rom the blower performance. (See Ttiblc I I.)

Knowing t}~erequired blower RPM and the blower motor

11P,the ~ettulg (t urns open) for the supply alr motor pIIllcy

can be determmecl from T~b Ie 7. The 20 I {P drive ior the

DS(’480 has J fixed mott)r pulley and a flxed speed,

Lach motor pulley has

A threaded barrel with two flats (or notc}lecf recesses)

180 degrees apart.

hither one or two movable flanges, each WIIII two set

screws 180 degrees apart.

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CES