T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
35
c l i m a t e m a s t e r. c o m
Tr a n q u i l i t y
®
W a t e r- t o - W a t e r T H W S e r i e s
R e v i s e d : 0 2 J a n u a r y, 2 0 1 3
a. Check the voltage and current. They should
comply with the electrical specifi cations
described on the
unit nameplate.
b. Look for wiring errors. Check for loose
terminal screws where wire connections have
been made on both the line and low-voltage
terminal boards.
c. Check the supply and return piping. They must
be properly connected to the inlet and outlet
connections on the unit.
d. If the checks described above fail to reveal
the problem and the unit still will not operate,
contact a trained service technician to ensure
proper diagnosis and repair of the equipment.
Table 8: Heat Exchanger Water Pressure Drop
CXM/DXM Safety Control Reset
Lockout -
In Lockout mode, the Status LED will begin
fast fl ashing. The compressor relay is turned off
immediately. Lockout mode can be soft reset via the
“Y” input or can be hard reset via the disconnect. The
last fault causing the lockout will be stored in memory
and can be viewed by going into test mode.
Fault Retry -
In Fault Retry mode, the Status LED
begins slow fl ashing to signal that the control is trying
to recover from a fault input. The CXM control will
stage off the outputs and then “try again” to satisfy
the thermostat "Y" input call. Once the input calls
are satisfi ed, the control will continue on as if no fault
occurred. If 3 consecutive faults occur without satisfying
the "Y" input call, then the control will go to Lockout
mode. The last fault causing the lockout will be stored
in memory and can be viewed by going into test mode.
Consult the CXM AOM for complete descriptions.
Note: Units have a fi ve minute time delay in the
control circuit that can be bypassed on the CXM PCB.
1. Adjust all valves to their full open position. Turn on
the line power to all heat pump units.
2. Operate each heat pump in the heating cycle.
Verify heat exchanger fl ow rates based upon table
7 and temperature drop/rise based upon unit
performance tables.
3. Establish a permanent operating record by logging
the unit operating conditions at initial start-up for
each unit.
4. If a unit fails to operate, conduct the following
checks:
WARNING!
WARNING!
When the disconnect switch is closed,
high voltage is present in some areas of the electrical
panel. Exercise caution when working with energized
equipment.
WARNING!
WARNING!
Verify ALL water controls are open and allow
water
fl
ow prior to engaging the compressor. Freezing of
the coax or water lines can permanently damage the heat
pump.
Unit Start-Up Procedure
Model
l/m
Pressure Drop kPa
-1°C
10°C
21°C
Source/Outdoor Coax
008
19.3
24.3
2.82
4.03
2.14
3.28
1.45
2.41
010
25.0
31.5
4.13
5.68
3.31
4.90
2.55
4.03
012
31.1
38.7
4.20
6.09
3.10
5.02
2.34
4.29
Model
l/m
Pressure Drop psi kPa
21°C
32°C
43°C
54°C
Load/Indoor Heat Exchanger
008
15.9
5.6
2.34
4.41
1.79
3.72
1.24
2.96
0.97
2.48
010
5.4
7.3
4.27
7.79
4.00
6.68
3.79
5.65
3.65
4.82
012
6.7
8.9
6.48
10.61
5.51
9.51
4.55
8.41
3.93
7.51
Multiply psi by 2.31 to obtain feet of head
Multiply kPa by 10 to obtain mBar
