Daikin WMC Instruction Manual download pdf (Page 10)

IOM 1210-1 • MAGNITUDE

MODEL WMC CHILLERS 10 www.DaikinApplied.com

InsTallaTIon

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.

• Condensers have two 200 psi, 1.0-inch female NPT relief

valves as a set with a three-way valve separating the two

valves. (See Figure 8.) One valve remains active at all

times and the second valve acts as a standby.

• Evaporators have a single 200 psi valve. Each valve has

a 1.0-inch female NPT connection.

• When purchased with a suction isolation valve, each

suction line has a single 200 psi relief valve rated at 6.9

lb/min air with a 3/8-inch are connection.

• Vessel valve capacity is 75 lb/min air.

CAUTION

Units are shipped with refrigerant valves closed to isolate the

refrigerant in the unit condenser. Valves must remain closed

until startup by the factory service technician.

Most 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; where local codes do not apply, the latest

issue of ANSI/ASHRAE Standard 15 code recommendations

must be followed.

Condenser Relief Valves

As stated previously and as shown in Figure 8, condensers

have two 200 psi, 1.0-inch female NPT relief valves separated

by a three-way valve.

Figure 8: Condenser Three-Way Relief Valve

In order to ensure proper installation, it is important to know

how the three-way relief valve functions. When the stem of the

three-way valve is pushed 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 9. When the stem of

the three-way valve is pulled back completely, the valve is in

“Back Seated Position” and all refrigerant will ow through the

front outlet port as shown in Figure 10.

Figure 9: Three-Way Valve, Front Seated Position

Figure 10: Three-Way Valve, Back Seated Position

When the valve stem is not pushed forward or pulled back

completely, the valve is in “Mid Position,” as shown in Figure

11.

CAUTION

Do not operate the system with the three-way valve stem in

the Mid Position.

Figure 11: Three-Way Valve, Mid Position

Three-Way Valve

Relief Valves

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Daikin WMC Instruction Manual Page 10

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