Heat Controller DXM2 Application And Instruction Manual page 14

Application, Operation, & Maintenance Manual
DXM2 Controls
setback is not connected and NSB is connected to Ground
"C", then if OVR is momentarily connected to 24VAC
(minimum 1 second) then the OVR input is recognized
as a Night Setback Override signal and the DXM2Control
reverts from Night Setback and begins monitoring
thermostat inputs for heating and cooling calls for a 2 hour
override period. If NSB is connected to ground "C", then if
OVR is continuously connected to 24VAC, then the OVR
input is recognized as a call for NLL Staged Heating and
the control enters NLL Staged Heating.
ESD – ESD is the input for Emergency Shutdown Mode.
When the ESD input is connected to Ground "C", all inputs
are ignored and all outputs are turned off. There will be a
random start timer when coming back from ESD.
H – The H input function is determined by the setting of
DIP2.7, assuming the control is not controlling a internal
fl ow center or an accessory relay is not confi gured for
Whole House Dehumidifi cation or humidifi er operation.
If DIP2.7 = on then the H input is defi ned as Automatic
Dehumidifi cation Mode and is used as an "automatic"
Table 5:
System Inputs with the resulting demand.
Table 5 describes demand changes with differing system input (ESD,
NSB, OVR) and DIP input settings. Resulting Demand #1 is derived from
Table 4.
System Inputs
Resulting Demand
#1 (From Table 4)
ESD NSB
- X -
Invalid - -
All (Excluding Invalid) - -
All (Excluding Invalid) - -
C1, C2 - -
OFF, F, H1, H2, or H3 - -
EH - -
All (Excluding Invalid) - X
All (Excluding Invalid) - X
C1, C2 - X
OFF, F, H1, H2, or H3 - X
EH - X
All (Excluding Invalid) - X
All (Excluding Invalid) - X
C1, C2 - X
OFF, F, H1, H2. or H3 - X
EH - X
"M" is momentary input
"X" is continuous input
Resulting
NSB Type Demand #2
OVR
(After ESD, NSB)
- - ESD
- - Invalid
- - All (Excluding Invalid)
M - All (Excluding Invalid)
X - Invalid
X - NLL Staged Heating
X - EH
- Mechanical Standby/OFF
All for 2 hours and
then revert to Stand-
M Mechanical
by/OFF (Excluding
Invalid)
X Mechanical Invalid
X Mechanical NLL Staged Heating
X Mechanical EH
Digital /
- All (Excluding Invalid)
Comm
Digital /
M All (Excluding Invalid)
Comm
Digital /
X Invalid
Comm
Digital /
X NLL Staged Heating
Comm
Digital /
X EH
Comm
DXM2 UNIT CONTROLS
counterpart to DIP1.5, meaning if H is connected to
24VAC then the selected fan outputs will operate using
dehumidifi cation speeds and airfl ow settings for cooling. If
H is not connected to 24VAC then the selected fan outputs
will operate using normal speeds and airfl ow settings for
cooling.
If DIP2.7 = off then the H input is defi ned as High Speed
Fan input and is used as an input to call for High Speed
Fan. If the control is in normal operating modes such as
Standby, Cooling or Heating AND the H input is connected
to 24VAC, then the selected fan outputs will operate
using high speed, or high speed airfl ows at all times (this
operation is a high speed fan version of the G input).
Other Outputs
Electric Heat – Outputs EH1 and EH2 turn on whenever
the DXM2 Control is in the following modes: Heating Stage
3, Emergency Heat, and Boilerless Operation.
Status LED – The Status LED is green. The Status LED
indicates the operating status of the DXM2 Control. See
Table 4: "LED and Alarm Relay Operation".
Fault LED – The Fault LED is red. The Fault LED displays
the current operating status of the control, or fl ashes the
corresponding code for the last fault that has occurred
if the test mode is active. If there is no fault in memory,
then the Fault LED will fl ash Code 1. If the Fault type is
"Primary" (HP, LP, LT1, LT2, or CO) then the Fault type will
always be retained in memory (Primary faults will overwrite
Secondary faults). If the Fault type is "Secondary" (Over/
Table 6:
"H" input with resulting demand modes.
Table 6 describes demand changes with "H" input and DIP 2.1-2.3, and
2.7 settings. Resulting Demand #2 is derived from Table 5.
Resulting Demand Auto Dehum / F2
H
#2 (From Table 5)
Standby/OFF X Auto Dehum Mode
Dehum enabled
Standby/OFF X
F1 X Auto Dehum Mode
F1 X
C1 X Auto Dehum Mode
C1 X
C2 X Auto Dehum Mode
C2 X
H1 X Auto Dehum Mode
H1 X
H2 X
H3 X
EH X
Invalid -
* = signifi es that High Fan is locked on regardless of any Dehum demands
14
Heat Controller, Inc.
Resulting Demand # 3 (After
DIP 2.7 DIP 2.1-2.3, 2.7 Logic)
Standby/OFF with Auto
High Fan Mode F2
F1 with Auto Dehum enabled
High Fan Mode F2
C1 with fan destage
High Fan Mode *Cooling with High Fan
C2 with fan destage
High Fan Mode *Cooling with High Fan
H1
High Fan Mode Heating with High Fan
- H2
- H3
- EH
- Invalid