IM 742 / Page 21
Pump Restart Relay Kit P/N 061419001
Used as an option with the Mark IV/AC board, the pump
restart relay kit provides a means to alert the loop water
controller that water flow is required by a WSHP so that the
system pump can be started . This option is typically used in
installations where the pump may be shut off when there is
no need for water flow (i .e . temperature OK, etc .) . Typically
only one pump restart relay kit is required per installation
as up to 200 Mark IV/AC boards can be “daisy-chained”
together .
The Mark IV/AC “P” terminal is used to determine WSHP
compressor operation . Wired as shown below, when com-
pressor operation is required, the Mark IV/AC “P” terminal
WSHP Mark IV/AC Board Low Voltage Terminal Strip
Pump
Restart
Relay
7
6
5
4
3
2
1
O W2 G W1 Y1 F E L U A P V R C
Loop
Water
Controller
Terminals
Daisy chain to other Mark
IV/AC board “P” and “C”
terminals
64
58
65
WSHP Mark IV/AC Board Low Voltage Terminal Strip (Circuit 1)
Pump
Restart
Relay
7
6
5
4
3
2
1
O W2 G W1 Y1 F E L U A P V R C
Power by
others
Daisy chain to other Mark
IV/AC board “P” and “C”
terminals
Wiring Pump Restart Relay when Installed within the LWC Panel
Wiring Pump Restart Relay when Installed within a WSHP Control Box
will change state causing a contact closure between terminal
58 and 64 signaling the loop water control (LWC) panel to
restart the loop pump if Off .
The pump restart relay kit is typically mounted within one
WSHP or within the LWC panel, whichever is more conve-
nient, diagrams are provided below for each location . To
install the relay, remove the cover on the double-faced tape
provided on the relay and attach the relay either to the inside
of the LWC panel (adjacent to circuit breaker CB1 and termi-
nal block TB3) or in the WSHP control box (in a convenient
location), then wire as shown below .