Specifications

Section-1 Introduction

November 11, 2013

1‐14

WARNING:Disconnectprimarypowerpriortoservicing. 888‐2628‐300

Figure 1-15 Heat Exchanger-Vertical Air Flow

Note

The heat exchanger shown in Figure 1-14 is configured for horizontal air flow .The two fans pull air

through the cooling coil/fins (not visible in the photos) and exhaust it parallel with the ground. Figure 1-

15 shows a unit configured for vertical air flow. The exhaust in the vertical air flow unit is upward. HE

version heat exchangers can be mounted for horizontal or vertical air flow depending on how the legs are

attached to the heat exchanger.

1.2.9.2.1 HeatExchangerFanControl

Multi‐cabinettransmitterswilltypicallyhaveone heatexchangerandcontrolpanel/pumpmoduleperPAcabinet.

Thefansarecon trolledelectronicallyandenabledwheneverthepumpmoduleisconnectedtothetransmitterwith

powerapplied.Fanspeedsarecontrolledbythepumpmoduleinvertercontrolsandwillincreaseautomaticallyas

coolant

temperatureincreases.Coolingfansdonotactivateuntilthecoolanttemperaturerisesabove30

1.2.9.2.2 PumpOperation/ControlLogic

Pumpoperationisautomaticallycontrolledusingtwoinvertercontrollers(oneperpump).Therearetwomodesof

pumpoperation,"LOCAL"and"REMOTE".Thepumpmodulecommunicateswiththetransmitterviathepump

controlinterface(PCI)locatedintheTCU.ThepumpcontrollerreceivesandsendssignalstothetransmitterPCI.

With

"LOCAL"selectedastatussignalissenttothePCIreportingthemodeselection.

Iftransmitterissettoautomaticpumpswitchmode,thelossofflowcausesactivationofthestandbypump.

MinimumflowratesvarydependingonthenumberofPAmodulesandaregivenin

Section2.15.1onpage2‐29.

Note

Four pump switches in less than five minutes will cause both pumps to shut down and require operator

intervention to restart.

1.2.9.3 PAModuleandCombinerColdPlates

EachPAmodulehasaliquidcooledcoldplatewhichconnectstothecoolingsystemwithquickreleaseconnectors.

Therearealsocoldplatesinsidethecombiner(s)andsplitter(s)towhichalloftheinternalcombiner/splitterreject

loadsareattached.See

Figure1‐16forcabinetcoolantroutingandmoduleslotnumbering.

Note

Module locations vary depending on model number. See the outline drawing or Table 5-1 on page 5-2 to

identify which PA modules slots are used depending on model.