United Technologies Carrier Weathermaker 48A2, Controls, Start-Up, Operation, Service, And Troubleshooting

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Table 30 — Service Test
THIRD PARTY CONTROL
Thermostat —
The method of control would be through
the thermostat inputs:
Y1 = first stage cooling
Y1 and Y2 = first and second stage cooling
W1 = first stage heating
W1 and W2 = first and second stage heating
G = supply fan
Alarm Output —
The alarm output TB4-7 and 8, will pro-
vide relay closure whenever the unit is under an alert or alarm
condition.
Remote Switch —
The remote switch may be configured
for three different functions. Under Configuration

UNIT, set
RM.CF to one of the following:
0 = no remote switch
1 = occupied/unoccupied switch
2 = start/stop switch
3 = occupancy override switch
With
RM.CF set to 1, no time schedules are followed and
the unit follows the remote switch only in determining the state
of occupancy.
With RM.CF set to 2, the remote switch can be used to shut
down and disable the unit, while still honoring time guards on
compressors. Time schedules, internal or external, may be run
simultaneously with this configuration.
With RM.CF set to 3, the remote input may override an
unoccupied state and force the control to go into occupied
mode. As with the start/stop configuration, an internal or exter-
nal time schedule may continue to control occupancy when the
switch is not in effect.
Under Configuration

SW.LG

RMI.L , the remote occu-
pancy switch can be set to either a normally open or normally
closed switch input. Normal is defined as either unoccupied, start
or “not currently overridden,” respective to the RM.CF
configuration.
VFD Control —
On VFD equipped supply fans, supply
duct static pressure control may be left under unit control or be
externally controlled. To control a VFD externally with a 4 to
20 mA signal, set SP.RS to 4, under the Configuration

SP
menu. This will set the reset to VFD control. When SP.RS = 4,
the static pressure reset function acts to provide direct VFD
speed control where 4 mA = 0% speed and 20 mA = 100%
( SP.MN and SP.MX will override). Note that SP.CF must be
set to 1 (VFD Control) prior to configuring SP.RS = 4. Failure
to do so could result in damage to ductwork due to overpressur-
ization. In effect, this represents a speed control signal “pass
through” under normal operating circumstances. The Com-
fort Link controller overrides the third party signal for critical
operation situations, most notably smoke and fire control. Wire
the input to the controls expansion module (CEM) using TB-11
and 12. An optional CEM board is required.
See Appendix C and the VFD literature supplied with the unit
for VFD configurations and field wiring connections to the VFD.
Supply Air Reset —
With the installation of the CEM,
the Comfort Link controller is capable of accepting a 4 to
20 mA signal, to reset the supply-air temperature up to a maxi-
mum of 20 F. See VFD Control section above.
Demand Limit Control —
The term “demand limit
control” refers to the restriction of the machine’s mechanical
cooling capacity to control the amount of power that a machine
may use.
ITEM EXPANSION RANGE UNITS POINT WRITE STATUS
TEST Service Test Mode ON/OFF MAN_CTRL
STOP Local Machine Disable YES/NO UNITSTOP config
S.STP Soft Stop Request YES/NO SOFTSTOP forcible
FAN.F Supply Fan Request YES/NO SFANFORC forcible
F.4.CH 4 in. Filter Change Mode YES/NO FILT4CHG
INDP TEST INDEPENDENT OUTPUTS
ECN.C Economizer Act.Cmd.Pos. ECONCTST
E.PWR Economizer Power Test ECONPTST
E.CAL Calibrate the Economizer? ECON_CAL
PE.A Power Exhaust Relay A PE_A_TST
PE.B Power Exhaust Relay B PE_B_TST
PE.C Power Exhaust Relay C PE_C_TST
H.I.R Heat Interlock Relay ON/OFF HIR_TST
ALRM Remote Alarm/Aux Relay ON/OFF ALRM_TST
FANS TEST FANS
S.FAN Supply Fan Relay ON/OFF SFAN_TST
S.VFD Supply Fan VFD Speed 0-100 % SGVFDTST
CD.F.A Condenser Fan Circuit A ON/OFF CNDA_TST
CD.F.B Condenser Fan Circuit B ON/OFF CNDB_TST
A.VFD MtrMaster A Commanded % 0-100 % OAVFDTST
B.VFD MtrMaster B Commanded % 0-100 % OBVFDTST
MMF.A MtrMaster Fan Circuit A ON/OFF MM A TST
MMF.B MtrMaster Fan Circuit B ON/OFF MM B TST
COOL TEST COOLING
A1 Compressor A1 Relay ON/OFF CMPA1TST
A2 Compressor A2 Relay ON/OFF CMPA2TST
MLV Min. Load Valve (HGBP) ON/OFF MLV_TST
DS.CP Digital Scroll Capacity 20-100 % DSCAPTST
B1 Compressor B1 Relay ON/OFF CMPB1TST
B2 Compressor B2 Relay ON/OFF CMPB2TST
RHV Humidimizer 3-Way Valve ON/OFF RHVH_TST
C.EXV Condenser EXV Position 0-100 % CEXVHTST
B.EXV Bypass EXV Position 0-100 % BEXVHTST
HEAT TEST HEATING
HT.ST Requested Heat Stage 0-MAX HTST_TST
HT.1 Heat Relay 1 ON/OFF HS1_TST
HT.2 Heat Relay 2 ON/OFF HS2_TST
HT.3 Relay 3 W1 Gas Valve 2 ON/OFF HS3_TST
HT.4 Relay 4 W2 Gas Valve 2 ON/OFF HS4_TST
HT.5 Relay 5 W1 Gas Valve 3 ON/OFF HS5_TST
HT.6 Relay 6 W2 Gas Valve 3 ON/OFF HS6_TST
HMZR TEST HUMIDI-MIZER
RHV Humidimizer 3-Way Valve ON/OFF RHVH_TST
C.EXV Condenser EXV Position 0-100 % CEXVHTST
B.EXV Bypass EXV Position 0-100 % BEXVHTST
C.CAL Condenser EXV Calibrate ON/OFF CEXV_CAL
B.CAL Bypass EXV Calibrate ON/OFF BEXV_CAL