User Guide

Service Manual NeoTherm 80 - NeoTherm 285

Removing and Replacing

the SOLA Controller

AlloftheNTunitsusetheSOLAcontroller.Thisprocedureexplainshow

toremoveandreplacethiscontroller.

Noticethat,asinstalledintheNTunit,theSOLAcontrollerismounted

“upsidedown.”Thisdoesnotaffectthewaythecontrolleroperates.

Ifyouorderareplacement,theSOLAcontrollerwillarrivewiththeEE-

PROM(programmingsoftware)alreadyinstalled.Theprogrammingis

differentfromonetypeofNTunittothenext.ThismeansthattheSOLA

controllersarenotinterchangeable.Whenyouorderthereplacement,

youmustspecifytheexacttypeofNTunityouhave.

Tools and equipment required

• 1/4”socket

Procedure

1. Beforeyoubegin,recordalloftheexistingcontrolsettings,ifpos-

sible.Thiswillallowyoutore-enterthesettingsafteryouinstallthe

newcontroller.Recordthecurrentsettingsfortemperatureset-

points,outdoorreset,andlead/lag.

2. Turnoffpowertothesystem.Usethemaindisconnectswitch

mountedabovethefrontpanel.

3. Removethefrontpanelfromtheunitbypullingitstraightout.

4. Disconnectthewiresandcablesleadingtotheunit:

 Atthetopofthecontroller:

 • Disconnectthegreenconnector.(Noticethatthisispluggedinto

therightendofthesocket.Besuretoreplaceitinthecorrectposi-

tion.)

 Ontheleftsideofthecontroller(readingtoptobottom):

 • DisconnectconnectorCP10fromJ10

 • DisconnectconnectorCP9fromJ9

 • DisconnectconnectorCP8AfromJ8(upperpart)

 • DisconnectconnectorCP8BfromJ8(lowerpart)

 Onthebottomofthecontroller:

 • UnplugconnectorJ2

 • UnplugconnectorJ1

Fig. D9-1 - Honeywell SOLA

controller