32
PFS 155C - 315C
OM 135
Menu 8, Lvg Evap Spts
Press the "NEXT MENU" key and Menu 8 will be displayed. This menu is password protected and requires the
operator password.
Item
Screen
Line
Diaplay
Field
Range
1
1
Spt Source=x
1
Local
Network
Active Spt=xx.x
o
F
2
2
ChWT Spt = x °F
1
CondWT Spt = x °F
2
1
Control Band = x °F
1
2
2
Startup DT = x °F
1
3
Shutdn DT = x °F
1
1
ChW Reset =
1
No Reset
Return
4-20mA
Network
Ice
OAT
Reset Signal =
2
3
2
Return Spt = x °F
1
No Reset@Oat = x °F
2
3
Max Reset = x °F
1
Max Reset @OaT = x °F
2
1
CondW Reset =
1
No Reset
Return
4-20mA
Network
Ice
OAT
4
Signal = x mA
2
2
Return Spt = x °F
1
No Reset @OaT = x °F
2
3
Min Reset = x °F
1
Min Reset@OaT = x °F
2
Spt Source
= The value selected determines the source for the setpoint.
Local
- Will allow the chiller to use it's internal setpoint selected in this menu screen 1, line 2 (local spt). Local is also the
selection if a master/slave arrangement exists between two 200 series controllers for the purpose of lead/lag control and
load balance control.
Network
-Will control the chiller from a remote panel such as a Chiller System Controller (CSQ). A network implies two
or more 200 series controllers connected to a level 1 device.
Active Spt=
This is a status value and cannot be changed. Active spt indicates the current setpoint (factoring in any
reset signals) that is controlling the chiller and can be used to determine if the chiller is maintaining leaving chilled water
temperature setpoint.
Control Band=
This is the actual chilled water leaving temperature for the chiller to maintain if there is not a network.
This is the default value used to control the chiller if a network communication failure occurs.
Startup Dt=
This value is added to the active spt setpoint. When the chiller is waiting for load and the water circulating
through the evaporator exceeds the active spt plus the startup dt, the chiller will start operation. Example: active spt =
44, startup dt = 10, the chiller will start when the water temperature exceeds 54. The startup dt along with the shutdn dt
can be used to reduce cycling of the chiller.
Shutdn Dt=
This value is subtracted from the active spt. When the leaving chilled water temperature reaches this
calculated value, the chiller will shutdown. Example: active spt = 44, shutdn dt = 4, the chiller will shutdown when the
water temperature leaving the evaporator is less than 40. The shutdn dt along with the startup dt can be used to reduce
cycling of the chiller.
Chw Reset=
There are several methods that can be selected to reset the leaving evaporator chilled water temperature.
No Reset
- This does not provide any reset and is the default value.
