JRE-Series
R e v. : A u g u s t 1 9 , 2 0 2 0
T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
I n s t a l l a t i o n , O p e r a t i o n , M a i n t e n a n c e
17
Electrical – Low Voltage Wiring, Cont’d.
Figure 4: Accessory Wiring
P2 Terminal Strip
Typical
Water
Valve
Accessory Relay 2 Configuration
Accessory Relay 1 Configuration
DIP 2.1
DIP 2.2
DIP 2.3
ACC1 Relay Option
ON
ON
ON
Cycle with fan
OFF
ON
ON
N/A for Residential Applications
ON
OFF
ON
Water valve – Slow opening
ON
ON
OFF
Outside air damper
OFF
ON
OFF
Reheat option – Dehumidistat
OFF
OFF
OFF
Reheat option – Humidistat
OFF
OFF
ON
N/A for Residential Applications
ON
OFF
OFF
N/A for Residential Applications
All other DIP combinations are invalid
DIP 2.4
DIP 2.5
DIP 2.6
ACC2 Relay Option
ON
ON
ON
Cycle with compressor
OFF
ON
ON
N/A for Residential Applications
ON
OFF
ON
Water valve – Slow opening
OFF
OFF
ON
Humidifier
ON
ON
OFF
Outside air damper
All other DIP combinations are invalid
A slow closing valve may be required to help reduce
water hammer. Figure 4 shows typical wiring for a
24VAC external solenoid valve. Figures 5 and 6 illustrate
typical slow closing water control valve wiring for Taco
500 series (Johnson Controls P/N AVM) and Taco SBV
series valves. Slow closing valves take approximately
60 seconds to open (very little water will flow before
45 seconds). Once fully open, an end switch allows the
compressor to be energized. Only relay or triac based
electronic thermostats should be used with slow closing
valves. When wired as shown, the slow closing valve will
operate properly with the following notations:
1. The valve will remain open during a unit lockout.
2. The valve will draw approximately 25-35 VA through
the “Y” signal of the thermostat.
Note: This valve can overheat the anticipator of an
electromechanical thermostat. Therefore, only relay or
triac based thermostats should be used.
