Carrier GZ024 Installation Instructions Manual page 14

UPM Circuit Board
C
MVBR3F or MVBR4F
NOTE: Optional wiring if wiring kit #4129 is not used.
Fig. 17 - - Solenoid Valve Wiring
From PL5 ext. harness
IMPORTANT:
Ensure that wire
colors match up
harness (brown
C
to brown, blue
to blue, black to
MVBR3F or MVBR4F
black.
Existing female plug 4129 Extension Harness
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).
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
W/Y END
SWITCH
A150166
From PL5 ext. harness
W/Y E ND
C W/Y
SWIT C H
MVBR3F or MVBR4F
VALVE #1
VALVE #2
Brown
C
at valve #1 & 2
W/Y
Yellow at valve #1
Gray
Fig. 18 - - Two 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.
E ND
SWIT C H
W/Y
at valve #2
IMPORTANT
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.
may have higher VA requirements than the MVBR3F and
MVBR4F valves
14
UPM Circuit Board
A160124