Trane YHC048F - Page 5

Table of Contents
RT-SVX21AC-EN 5
Procedure . . . . . . . . . . . . . . . . . . . . . . . . . 51
Unit Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Sequence of Operation . . . . . . . . . . . . . . . . . . 53
ReliaTel™ Controls . . . . . . . . . . . . . . . . . . 53
ReliaTel™ Controls - Constant Volume (CV)
53
ReliaTel™ Control Cooling without an Econo-
mizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Three-Stages of Cooling . . . . . . . . . . . . . 53
ReliaTel™ Control Evaporator Fan Operation
(for Gas Units) . . . . . . . . . . . . . . . . . . . . . 53
ReliaTel™ Control Evaporator Fan Operation
(for Cooling Only Units) . . . . . . . . . . . . . . 54
Low Ambient Operation . . . . . . . . . . . . . 54
Multi-Speed Indoor Motor . . . . . . . . . . . . 54
Fan Output% . . . . . . . . . . . . . . . . . . . . . . . 54
Multi-Zone VAV Sequence of Operation . 54
Supply Air Pressure Control . . . . . . . . . . 54
Supply Air Static Pressure Limit . . . . . . . 55
Supply Air Temperature Controls . . . . . . 55
Supply Air Setpoint Reset . . . . . . . . . . . . 55
Zone Temperature Control . . . . . . . . . . . 55
Variable Air Volume Applications (Single
Zone VAV)
. . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Discharge Air Cool Setpoint Adjustment 56
ReliaTel™ Control Cooling with an Economiz-
er . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
ReliaTel™ Control Dehumidification . . . 57
Dehumidification Coil Purge Cycle . . . . . 57
ReliaTel™ Control Cooling with an Economiz-
er . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Economizer Set-Up . . . . . . . . . . . . . . . . . 58
ReliaTel™ Control Heating Operation (for
Cooling Only Units) . . . . . . . . . . . . . . . . . 58
ReliaTel™ Control Heating Operation (for Gas
Units) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Ignition Module . . . . . . . . . . . . . . . . . . . . 58
Drain Pan Condensate Overflow Switch (Op-
tional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Electromechanical Controls . . . . . . . . . . . . 59
Electromechanical Control Cooling without
an Economizer . . . . . . . . . . . . . . . . . . . . . 59
Electromechanical Control Evaporator Fan
Operation (for Gas Units) . . . . . . . . . . . . .59
Electromechanical Evaporator Fan Operation
(for Cooling Only Units) . . . . . . . . . . . . . . .60
Economizer Set-Up . . . . . . . . . . . . . . . . . .60
Electromechanical Control Cooling with an
Economizer . . . . . . . . . . . . . . . . . . . . . . . . .60
Electromechanical Control Heating Operation
(for Cooling Only Units) . . . . . . . . . . . . . . .60
Electromechanical Control Heating Operation
(for Gas Units) . . . . . . . . . . . . . . . . . . . . . .60
Ignition Module Low, Medium and High Heat
60
Drain Pan Condensate Overflow Switch (Op-
tional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Verifying Proper Air Flow . . . . . . . . . . . . . . .61
Units with 5-Tap Direct Drive Indoor Fan .61
Units with Belt Drive Indoor Fan . . . . . . . .62
Units with Direct Drive Indoor Fan - Electro-
mechanical Control . . . . . . . . . . . . . . . . . .62
ReliaTel™ Units with Direct Drive Indoor Fan
62
Units with Constant CFM Direct Drive Indoor
Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
17 Plus units with the constant CFM direct
drive indoor fan . . . . . . . . . . . . . . . . . . . . .64
Variable Air Volume Applications (Traditional
VAV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Supply Duct Static Pressure Control . . . .65
Traditional VAV Standalone Operation . .65
Supply Air Temperature Reset . . . . . . . . .66
Return Air Smoke Detector . . . . . . . . . . . .66
Economizer Start-Up . . . . . . . . . . . . . . . . .66
Compressor Start-Up . . . . . . . . . . . . . . . . .67
Dehumidification Option . . . . . . . . . . . . . .67
Gas Heat Units . . . . . . . . . . . . . . . . . . . . . .68
Final System Setup . . . . . . . . . . . . . . . . . .68
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Fan Belt Adjustment - Belt Drive Units . . . .69
Monthly Maintenance . . . . . . . . . . . . . . . . . .70
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
Return Air Smoke Detector Maintenance 70
Condensate Overflow Switch . . . . . . . . . .70
Cooling Season . . . . . . . . . . . . . . . . . . . . .70