Daikin Navigator WWV - Three-Way Bypass Valve Operation; Refrigerant Relief Valve Function and Safety

11
IOM 1264-4
WWW.DAIKINAPPLIED.COM
INSTALLATION
Three-Way Bypass Valve Operation
To modulate the water temperature in the condenser, install
a three-way by-pass valve. The three-way valve position can
be modulated by a 0-10Vdc signal from the unit controller to
regulates proper water temperature.
VFD Operating with a Condenser Water Pump
In place of a valve, use a circulation pump controlled by an
inverter.
The VFD speed may be controlled by an analog 0-10 Vdc signal
issued by the controller according to the water temperature
entering the condenser.
Relief Valves
As a safety precaution and to meet code requirements, each
chiller is equipped with pressure relief valves located on the
condenser and evaporator for the purpose of relieving excessive
refrigerant pressure (caused by equipment malfunction, re, etc.)
to the atmosphere.
Table 2: Three-Way Relief Valve Data
Chiller WWV
Relief Valve Evaporator Condenser
Location Top of vessel Top of vessel
Pressure Setting (psi) 225 325
Discharge Cap.(lb/
min air)
84.4 111
Qty 1 set 1 set
Connection Size 1.0-inch female
NPT
1.0-inch female
NPT
Building codes require that relief valves be vented to the outside
of a building. Relief piping connections to the relief valves must
have exible connectors.
Remove plastic shipping plugs (if installed) from the inside of
the valves prior to making pipe connections. Whenever vent
piping is installed, the lines must be in accordance with local
code requirements and ANSI/ASHRAE Standard 15 code
recommendations must be followed.
In order to ensure proper installation, it is important to know how
the three-way relief valve functions. One valve remains active
at all times and the second valve acts as a standby. When the
stem of the three-way valve is turned into the valve completely,
the valve is in “Front Seated Position” and all refrigerant will ow
through the back outlet port, as shown in Figure 8. When the
stem of the three-way valve is turned back completely, the valve
is in “Back Seated Position” and all refrigerant will ow through
the front outlet port as shown in Figure 9.
Figure 7: Three-Way Relief Valve
No. Description
1 Relief Valves
2 Three-Way Valve
Figure 8: Three-Way Valve, Front Seated Position