14
UPM Circuit Board
W/YC
END
SWITCH
MVBR3F or MVBR4F
NOTE: Optional wiring if wiring kit #4129 is not used.
A150166
Fig. 17 -- Solenoid Valve Wiring
Communicating controls notes:
1. The UPM board includes a delay at terminal Y1 (connector
ST1) that delays the compressor from starting after
receiving a call from the thermostat to provide time for the
valve to fully open. Therefore, the end switch is not used for
communicating controls.
2. For systems with two valves, see Fig. 18.
To CC and Y2S
4129 Extension Harness
UPM Circuit Board
Existing female plug
C
W/Y
Brown
Yellow
Gray
at valve #2
at valve #1 & 2
W/YC
END
SWIT C H
MVBR3F or MVBR4F
VALVE #1
W/YC
END
SWIT C H
MVBR3F or MVBR4F
VALVE #2
From PL5 ext. harnessFrom PL5 ext. harness
W/Y
at valve #1
Brown
Yellow
Brown
Gray
IMPORTANT:
Ensure that wire
colors match up
harness (brown
to brown, blue
to blue, black to
black.
IMPORTANT
A160124
Communicating controls notes:
1. Y2 (connector ST1) is used for a utility curtailment input,
and is not available for use as an output for the second
valve. However, the wiring harness extension (part # 4129)
used for variable speed flow centers (closed loop
applications) provides a second stage connection as shown
above (gray/brown wires). The wiring kit should be used
for systems with two solenoid valves (yellow wire for stage
1, gray wire for stage 2, brown wire for common to both
valves).
2. The UPM board delays the compressor from starting after
receiving a call from the thermostat to provide time for the
valve to fully open. Therefore, the end switch is not used for
communicating controls.
Fig. 18 -- Two Solenoid Valve Wiring
Transformer Sizing
Each MVBR3F/MVBR4F valve may use up to 11.5 VA. Verify
heat pump installation manual to ensure that heat pump
transformer is large enough for heat pump controls, water solenoid
valve(s), and any other accessories. Other water solenoid valves
may have higher VA requirements than the MVBR3F and
MVBR4F v alves
To Next Page
Loading...
