Troubleshooting guide

MAGNUM VERSION 8 MANUAL REVISION 3.1
153
# Name Description
119 EcoOffsetON Temperature offset to determine when the economizer can be used. The ambient
temperature must be less than Setpoint #1 “CTL TARGET “minus the value of this
Setpoint for the economizer to begin.
120 Eco Stg Dely Once the economizer valve has been opened to its maximum and all fans associated only
with it have been turned on, the economizer function will wait this time in seconds before
the first condenser fan is turned on or VFD is set to its minimum position. The minimum
setting of the VFD is the value of Setpoint #54 “CND MIN SPD”.
120 H-PMP SW TIME Time delay for switching between heating and cooling modes for heat pumps.
121 Eco MIN VLV% Minimum Economizer Analog Output valve percentage. This will be the value used when first
starting the economizer function as well as the lowest level before turning off. This
Setpoint must be active to indicate that the Economizer AO option is active.
122 Eco MAX VLV% Maximum Economizer Analog Output valve percentage.
123 Eco MAX ADJ Maximum adjustment to the Economizer Analog Output valve percentage with each
calculation. Formula:[absolute value of(Target – current) * Multiplier Setpoint #126] /
Divisor Setpoint #127
124 EcoVlvAdjDly Delay between Economizer Analog Output valve adjustments.
125 Eco StageDly Time delay between economizer reaching its maximum opening and turning on the
associated condenser fans.
If no condenser fans associated, then this Setpoint needs to be 0 and non-active.
126 Eco MULTI Multiplier to scale adjustments to the Economizer Analog Output valve percentage. The
difference between the control sensor and its target will be multiplied by this value.
127 Eco DIVIDE Divisor to scale adjustments to the Economizer Analog Output valve percentage. The
difference between the control sensor and its target will be divided by this value.
128 Lost Leg Alarm
(Only HVAC)
If active, a check for a lost leg (lost current flow) on a part winding starter is added. A current
sensor will be placed on only one of the legs; it must be set up to be multiplied by 2
in MCS-Config (select CT-### x2 as the sensor in the SI screen). If current flow to
the leg with the sensor is lost, a low amp alarm will be generated. If the sensor is
reading more than the wanted FLA times the value of this Setpoint for the specified
period of time, then a high amp alarm is generated.
CmpMinSpeed%
(Only CENT)
This is the minimum allowed compressor speed. This value will dynamically change based on
an internal calculation, but will never be less than the original number.
129 RH CUTIN
(Only HVAC)
Used with the ‘Hot Gas Reheat’ option. If the reheat sensor temperature is less than this
value, then the hot gas reheat function will be activated.
CmpMaxSpeed%
(Only CENT)
This is the maximum allowed compressor speed.
130 RH CUTOUT ADJ
(Only HVAC)
The reheat cutout temperature is calculated by adding this value to Setpoint #129 “RH
CUTIN”
CmpSpdUnld%
(Only CENT)
The value in this Setpoint is the actual % decrease in this adjustment to the compressor AO,
when adjusting to meet the calculated Wanted %. Cannot be greater than 1.
131 RH START DLY
(Only HVAC)
Delay in seconds that the hot gas reheat function will remain in startup mode.
CmpSpdLoad%
(Only CENT)
The value in this Setpoint is the actual % increase in this adjustment to the compressor AO,
when adjusting to meet the calculated Wanted %. Cannot be greater than 1.
132 RH BLEED DLY
(Only HVAC)
Delay in seconds that the hot gas reheat function will keep the bleed solenoid on before
exiting reheat mode.
MinLiftTemp
(Only CENT)
This is the minimum allowed lift temperature. Refer to Setpoint #128 “CmpMinSpeed%“.
133 RH STAGE DLY
(Only HVAC)
Delay in seconds until the hot gas reheat function starts when all criteria has been meet.
MaxLiftTemp
(Only CENT)
This is the maximum allowed lift temperature. Refer to Setpoint #128 “CmpMinSpeed%“.
134 BARREL HEATER If ambient falls below this temperature, then the barrel heater will turn on.
135 REFRIG LEAK Used to detect a digital signal from a refrigerant leak detector.