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✓� <br /> � / APPLICATION A <br /> S�ri�g I�ola�ion a�ac� �orner V��igh�� Recommended Temperature Controi <br /> The sum of the carner weighfs (Table 1)exceeds the total The primery requirements for condensing unit controls are to <br /> weight by about 1 Q°lo to aliow a safety factor in spring maintain proper entering and leaving temperatures. Detaiis <br /> selections. vary with each job and are related to design saturated suction <br /> femperatures and conditioned air temperature. <br /> Table 1: Corner'VYeights{refer to Figure 5) If the project design conditions are: <br /> ����'#� �� �4+1e� ht�kt ����weR ht�{2 ���twe�ght �� `�We�g�t�t#� � �. T4-84 EDB and 62-70 EWB <br /> ��Umt Siz$ ,.��I s��� ��„ �I�s_ k �� b <br /> �`�`���,�������-_���(� � ��,.��,_t� l'���_���t�.�g?�.���_,��ti$) ��t.� 2. 52-57 LAT off the DX cail <br /> 015 408 5 571 � 399 � 559 <br /> azo____' 4v E sas �___aaa�� �sa � 3. 42-48 SST <br /> � . .--- -'_ --- - . _ _- --- ._ --- <br /> o2s i aae � ssa � as5 C s�s 4. Constant volume space or retum air temperature control <br /> 030 j 540 �# 706 �� 492 � E� 644�— <br /> Then: <br /> - _-- --- _. --- - - - - _ --------- <br /> 035 � 624 j 770 593 € 731 <br /> ---- ----- — :- —�--------- 1. Gompressors can be sequenced to maintain design <br /> aao � s32 ; 77s ; soo �3� _ space temperatures t about two degrees DB. If <br /> -___ _ -- - --_ - ------ - <br /> .�� 045 632 �zs sso 7zs excessive cycling occurs,then: <br /> 050 i 817 � 732 j 615 j 730 <br /> .___ �_�� __; ___ ._...._______;_ ____.____._�____ _ a. The sensor location is suspect or air changes are <br /> 062 j 654 768 j o52 � 764 U[IUSUaIIy hlgh. <br /> .__ . _._ . . . - - ---- <br /> o�a a�2 , �oaa � as2 � toso b. Cansider widening the space temperature control <br /> --- -_� ,__ ____. ,__.�_______. <br /> T_ <br /> 080 846 1029 � <br /> - � <br /> _____�._- -'---_ �__ - --'---------_�—_sis --'----- �i�a_— range beyond±two degrees. <br /> os2 i s2� j A�oo 995 i 1190 2_ V�/arning should be generated if LAT drops more than <br /> _ —_:___. ___ . <br /> �oo � _ sos , �oss s7a ' ��7a _ seven degrees below design. <br /> _ — ----- <br /> ��o � �075 � �sz� �as� �266 _ 3. HGBP is desired and allows even lower�AT limits. <br /> _ - - -- --i-—______ <br /> _ _ i -- _-- , <br /> 120 � 1144 � 1377 ! 1275 1535 <br /> -- — �--- �-- -- To minimize compressor cyciing, it is recommended ta <br /> t25 �sss ; �sas �3�4 ��92 include(a#minimum}three minute anti-cycling timers on <br /> � , <br /> . _ __ , ,_ -- --- ---- ----__-- <br /> �ao �aaz �s7a �ao� j6�� the condensing unit. �rogrammable controls should include <br /> additional time delay logic. <br /> Figure 5: S�ring A9oun#ing Hate Locations 1. Minimum OFF time for a stage is five minutes <br /> � X �.- � X �j 2, Minimum QN time for a stage is five minutes (unless an <br /> � �#1 #2 � alarm occurs). <br /> 2.s Z.5 For additional NlicroTech cantral information and compressor <br /> staging, refer to OM 920, page 65, 75, 76 and 94. <br /> J <br /> W <br /> a <br /> ¢ <br /> � <br /> 99.0�� � <br /> � <br /> � <br /> V <br /> 2.5�' 2.5. <br /> � �3 #P� ,} <br /> � X �- -� X � <br /> ,,�������.ktJni#,,Mo�et.w.�����,����F'��� ',�X"�(�nches") ��"��� ; <br /> Q15-025 �--- ------___--4.5 ---- <br /> � 03Q-140 -- ---9.5 � �-- <br /> wwtinr.DaikinApplied.com 7 CAT 222-4 •AIR-GOOLED SPLIT SYSTEM CONDENSER <br />