Hot Gas Bypass; Space Temperature Offset; Time Clock Configuration - Carrier Weathermaster 48P030-100 Controls, Start-Up, Operation, Service, And Troubleshooting

Hot Gas Bypass

The ComfortLink control system supports the use of an optional
minimum load hot gas bypass valve (MLV) that is directly con-
trolled by the ComfortLink control system. This provides an addi-
tional stage of capacity as well as low load coil freeze protection.
Hot gas bypass is an active part of the P-Series ComfortLink ca-
pacity staging and minimum evaporator load protection functions.
It is controlled through the Minimum Load Valve function. The
hot gas bypass option consists of a solenoid valve with a fixed ori-
fice sized to provide a nominal 3-ton evaporator load bypass. A
hot gas refrigerant line routes the bypassed hot gas from the dis-
charge line of circuit A to the suction line of circuit A. An addi-
tional thermistor in the suction line allows the unit control to mon-
itor suction superheat. When the unit control calls for hot gas by-
pass, the hot gas bypasses the evaporator and adds refrigeration
load to the compressor circuit to reduce the cooling effect from
Circuit A.
The hot gas bypass system is a factory-installed option installed on
Circuit A only. This function is enabled at Configura-
 
tion COOL MLV. When this function is enabled, an additional
stage of cooling capacity is provided by the unit control staging
sequences (see Appendix C, "UNIT STAGING TABLES" on
page 219).

Space Temperature Offset

Space Temperature Offset corresponds to a slider on a T56 sensor
that allows the occupant to adjust the space temperature by a con-
figured range during an occupied period. This sensor is only appli-
cable to units that are configured as Multi-Stage SPT control
 
(Configuration UNIT C.TYP = 4).
ITEM
TIME
HH.MM
DATE
MNTH
DOM
DAY
YEAR
SCH.L
PER.1

PER.1 DAYS
 
PER.1 DAYS MON
 
PER.1 DAYS TUE
 
PER.1 DAYS WED
 
PER.1 DAYS THU
 
PER.1 DAYS FRI
 
PER.1 DAYS SAT
 
PER.1 DAYS SUN
 
PER.1 DAYS HOL

PER.1 OCC

PER.1 UNC
Repeat for periods 2-8
HOL.L
HD.01

HD.01 MON

HD.01 DAY

HD.01 LEN
Repeat for holidays 2-30
DAY.S
DS.ST

DS.ST ST.MN

DS.ST ST.WK

DS.ST ST.DY

DS.ST MIN.A
DS.SP

DS.SP SP.MN

DS.SP SP.WK

DS.SP SP.DY

DS.SP MIN.S
Table 85 — Time Clock Menu
EXPANSION
TIME OF DAY
Hour and Minute
MONTH,DATE,DAY AND YEAR
Month of Year
Day of Month
Day of Week
Year
LOCAL TIME SCHEDULE
PERIOD 1
DAY FLAGS FOR PERIOD 1
Monday in Period
Tuesday in Period
Wednesday in Period
Thursday in Period
Friday in Period
Saturday in Period
Sunday in Period
Holiday in Period
Occupied from
Occupied to
LOCAL HOLIDAY SCHEDULES
HOLIDAY SCHEDULE 01
Holiday Start Month
Start Day
Duration (Days)
DAYLIGHT SAVINGS TIME
DAYLIGHT SAVINGS START
Month
Week
Day
Minutes to Add
DAYLIGHTS SAVINGS STOP
Month
Week
Day
Minutes to Subtract
ITEM EXPANSION
SP.O.S Space Temp Offset Sensor
SP.O.R Space Temp Offset Range
SPTO Space Temperature Offset
Space Temperature Offset Sensor (Configuration

SENS SP.O.S)
This configuration disables the reading of the offset slider.
Space Temperature Offset Range (Configuration

SENS SP.O.R)
This configuration establishes the range, in degrees F, that the T56
slider can affect SPTO when adjusting the slider from the far left
(-SP.O.R) to the far right (+SP.O.R). The default is 5°F.
Space Temperature Offset Value (Temperatures
SPTO)
The Space Temperature Offset Value is the reading of the slider
potentiometer in the T56 that is resolved to delta degrees based on
SP.O.R.

TIME CLOCK CONFIGURATION

This section describes each Time Clock menu item. Not every
point will need to be configured for every unit. Refer to the Con-
trols Quick Start section on page 35 for more information on what
set points need to be configured for different applications. The
Time Clock menu items are discussed in the same order that they
are displayed in the Time Clock table. The Time Clock table is
shown in Table 85.
RANGE
00:00
multi-text strings
0 to 31
multi-text strings
e.g. 2012
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
YES/NO
00:00
00:00
0 to 12
0 to 31
0 to 99
1 to 12
1 to 5
1 to 7
0 to 90
1 to 12
1 to 5
1 to 7
0 to 90
104
RANGE UNITS CCN POINT
Enable/Disable SPTOSENS
1 to 10 SPTO_RNG
+- SP.O.R ^F SPTO

UNIT

UNIT

AIR.T
CCN POINT DEFAULT
TIME
MOY
DOM
DOWDISP
YOCDISP
Period 1 only
PER1MON Yes
PER1TUE Yes
PER1WED Yes
PER1THU Yes
PER1FRI Yes
PER1SAT Yes
PER1SUN Yes
PER1HOL Yes
PER1_OCC 00:00
PER1_UNC 24:00
HOL_MON1
HOL_DAY1
HOL_LEN1
STARTM 4
STARTW 1
STARTD 7
MINADD 60
STOPM 10
STOPW 5
STOPD 7
MINSUB 60


