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Fig. 34: Fan-Proving Switch
Fig. 35: Blocked Vent Switch
UDB Diagnostic Board
/=>H=:6I:G>H:FJ>EE:9L>I=69>6<CDHI>87D6G9L=>8=
L>AA>C9>86I:;6JAIH6HI=:ND88JG-:;:GIDI=:;DAADL>C<
H:8I>DC ;DG >CHIGJ8I>DCH DC 688:HH>C< G:K>:L>C< 6C9
8
A:6G>C<I=:H:;6JAIH
UDB Fault History
/DK>:LI=:;6JAI8D9:H>CI=:0=>HIDGN;>A:
 +G:HHI=:UP DGDOWN 7JIIDCHDCI=:B:B7G6C:
HL>I8=;DGH:8DC9HID688:HHI=:;6JAI=>HIDGN
 +G:HH:>I=:G7JIIDCIDH8GDAAI=GDJ<=I=:G:8DG9:9
;6JAIH>C=>HIDGN
 /=:BDHIG:8:CI;6JAIG:8DG9:9L>AA7:I=:;>GHI;6JAI
9>HEA6N:9I=:A6HI;6JAIH6G:HIDG:9>CI=:=>H
IDGNDC6GDAA>C<76H>H/=:G:>HCDI>B:DG96I:
HI6BE6HHD8>6I:9L>I=I=:H:;6JAIH
 2=:C I=: =>HIDGN D; ;6JAIH =6H 7::C :M=6JHI:9
EJH=>C<I=: UP DGDOWN 7JIIDCH6<6>CL>AA GDAA
I=:;6JAI=>HIDGNDK:G6C9>IL>AAHI6GI6<6>C
 /D:M>II=:;6JAI=>HIDGNL6>I;DGH:8DC9H6C9
I=:7D6G9L>AA6JIDB6I>86AAN:M>II=:=>HIDGNBD9:
/D8A:6GI=:;6JAI=>HIDGNEG:HH6C9=DA9both I=:UP
6C9DOWN 7JIIDCH;DGH:8DC9HL=>A:I=:EDL:G>H
DC
>6<CDHI>8>C;DGB6I>DC>HEGDK>9:96CNI>B:6;6JAI>H
G:8DG9:9 /=>H >C;DGB6I>DC >H >CI:C9:9 ID 6HH>HI >C
AD86I>C<I=:EGD7A:BL>I=I=:=:6I:G7JI>HCDI:M=6JH
I>K:
$;BJAI>EA:;6JAI8DC9>I>DCHD88JG6II=:H6B:I>B:DCAN
I=:;6JAII=6I86JH:9I=:=:6I:GIDH=JI9DLCL>AA7:
G:8DG9:9>CI=:=>HIDGN
Fig. 37: UDB Diagnostic Board
Pump Time Delay
/=: 8DCDB6HI:G>H6;JAAN:C8ADH:9HDA>9HI6I:/-
L>I= 6 L=>I: ?JBE:G I=6I H:A:8IH DC: D; ILD I>B:
9:A6NH.::!><$;I=:?JBE:G>HDCE>CH6C9
9:;6JAII=:9:A6NI>B:>HB>CJI:H$;I=:?JBE:G>H
CDIDCE>CH6C9I=:I>B:9:A6N>HB>CJI:H
$C68DCK:CI>DC6AHNHI:BL=:CI=:FJ6HI6I>HH6I>H
;>:9 I=: B6>C <6H K6AK: 8ADH:H 7JI I=: EJBE
8DCI>CJ:HDE:G6I>C<2>I=I=:I>B:9:A6NG:A6NI=:7D>A
:G EJBE >H EGD<G6BB:9 ID 8DCI>CJ: GJCC>C< ;DG 6C
DEI>BJBE:G>D9D;I>B:>CDG9:GID67HDG7I=:G:H>9J6A
=:6I;GDBI=:8DB7JHI>DC8=6B7:G6C9JH:>I>CI=:
HNHI:B/=:EJBEI=:CH=JIHD;;JCI>AI=:C:MI86AA;DG
=:6I>HG:8:>K:9;GDBI=:FJ6HI6I
6
1
2
Fig. 36: Economaster Time Delay Relay (TDR)
NOTE: *C8:I=:=>HIDGN=6H7::C8A:6G:9>I86CCDI
7:G:8DK:G:9