Service manual

CLIMATEMASTER WATER-SOURCE HEAT PUMPS
Vertical Stack
Rev.: 11/09/12
34
ClimateMaster Water-Source Heat Pumps
DXM Control - For detailed control information, see
CXM AOM (part #97B0003N12), DXM AOM (part
#97B0003N13), Lon controller AOM (part #97B0013N01)
or MPC AOM (part # 97B0031N01).
-Slow Flash = 1 fl ash every 2 seconds
-Fast Flash = 2 fl ashes every 1 second
-Flash code 2 = 2 quick fl ashes, 10 second pause, 2 quick
fl ashes, 10 second pause, etc.
-On pulse 1/3 second; off pulse 1/3 second
Field Selectable Inputs - Test mode: Test mode allows
the service technician to check the operation of the
control in a timely manner. By momentarily shorting the
test terminals, the DXM control enters a 20 minute test
mode period in which all time delays are sped up 15
times. Upon entering test mode, the status LED will fl ash
a code representing the last fault. For diagnostic ease at
the thermostat, the alarm relay will also cycle during test
mode. The alarm relay will cycle on and off similar to the
status LED to indicate a code representing the last fault,
at the thermostat. Test mode can be exited by shorting
the test terminals for 3 seconds.
Retry mode: If the control is attempting a retry of a fault,
the status LED will slow fl ash (slow fl ash = one fl ash every
2 seconds) to indicate the control is in the process of
retrying.
Field Confi guration Options
Note: In the following fi eld confi guration options, jumper
wires should be clipped ONLY when power is removed
from the DXM control.
Water coil low temperature limit setting: Jumper
3 (JW3-FP1 Low Temp) provides fi eld selection of
temperature limit setting for FP1 of 30°F or 10°F [-1°F or
-12°C] (refrigerant temperature).
Not Clipped = 30°F [-1°C]. Clipped = 10°F [-12°C].
Air coil low temperature limit setting: Jumper 2 (JW2-
FP2 Low Temp) provides fi eld selection of
temperature limit setting for FP2 of 30°F or
10°F [-1°F or -12°C] (refrigerant temperature).
Note: This jumper should only be clipped
under extenuating circumstances, as
recommended by ClimateMaster technical
services.
Not Clipped = 30°F [-1°C]. Clipped = 10°F
[-12°C].
Alarm relay setting: Jumper 4 (JW4-AL2 Dry)
provides fi eld selection of the alarm relay
terminal AL2 to be jumpered to 24VAC or to
be a dry contact (no connection).
Not Clipped = AL2 connected to R.
Clipped = AL2 dry contact
(no connection).
Low pressure normally open: Jumper 1 (JW1-LP norm
open) provides fi eld selection for low pressure input to
be normally closed or normally open.
Not Clipped = LP normally closed. Clipped = LP normally
open.
DIP Switches - Note: In the following fi eld
confi guration options, DIP switches should only be
changed when power is removed from the DXM
control.
DIP Package #1 (S1) - DIP Package #1 has 8 switches
and provides the following setup selections:
1.1 - Unit Performance Sentinel (UPS) disable: DIP Switch
1.1 provides fi eld selection to disable the UPS feature.
On = Enabled. Off = Disabled.
1.2 - Compressor relay staging operation: DIP 1.2
provides selection of compressor relay staging operation.
The compressor relay can be selected to turn on with
a stage 1 or stage 2 call from the thermostat. This
is used with dual stage units (2 compressors where
2 DXM controls are being used) or with master/
slave applications. In master/slave applications,
each compressor and fan will stage according to
its appropriate DIP 1.2 setting. If set to stage 2, the
compressor will have a 3 second on-delay before
energizing during a Stage 2 demand. Also, if set for stage
2, the alarm relay will NOT cycle during test mode.
On = Stage 1. Off = Stage 2.
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Table 7b: DXM LED And Alarm Relay Operations
DXM Controls