70
SS-SVX11K-EN
Table 25. Economizer actuator circuit legend (continued)
Device
Designation Device Designation
Parts And Notes
MP
Minimum Position
Potentiometer
M.H. S96A1012
EFI
Evaporator Fan Interlock
Field Provided
7TB88
Low Voltage Terminal Strip Located in Temperature Controller Panel
R
1/4 Watt - 5% Carbon
1 Motor/Circuit = None Req; 2 Motors/ circuit = 1300 Ohms; 3 Motors/Circuit = 910 Ohms
No System Control
Temperature Control Parameters
WWAARRNNIINNGG
HHaazzaarrddoouuss VVoollttaaggee!!
FFaaiilluurree ttoo ddiissccoonnnneecctt ppoowweerr bbeeffoorree sseerrvviicciinngg ccoouulldd
rreessuulltt iinn ddeeaatthh oorr sseerriioouuss iinnjjuurryy..
DDiissccoonnnneecctt aallll eelleeccttrriicc ppoowweerr,, iinncclluuddiinngg rreemmoottee
ddiissccoonnnneeccttss bbeeffoorree sseerrvviicciinngg.. FFoollllooww pprrooppeerr
lloocckkoouutt//ttaaggoouutt pprroocceedduurreess ttoo eennssuurree tthhee ppoowweerr
ccaann nnoott bbee iinnaaddvveerrtteennttllyy eenneerrggiizzeedd.. VVeerriiffyy tthhaatt nnoo
ppoowweerr iiss pprreesseenntt wwiitthh aa vvoollttmmeetteerr..
Each unit ordered with the “No Controls” option,
requires a field provided and field wired temperature
controller. Single refrigerant circuit units require a 2-
step control device, and dual refrigerant circuit units
require a 4-step (20 to 60 ton units) or 6-step (80-120
ton units) control device.
Each unit is shipped from the factory with internal
“Fixed-On” & “Fixed-Off” time delays wired into each
step of cooling. The “Fixed-Off” timers are 5 minutes
each and they begin timing when the circuit for that
step of cooling is deactivated. The “Fixed-On” timers
are 3 minutes each and they begin timing when the
circuit for that step is activated.
NNoottee:: Units ordered with the “No Controls” option
cannot be used with EVP Chiller applications.
IInnssttaallllaattiioonn EElleeccttrriiccaall
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