Carrier WeatherExpert 48N2 Controls, Start-Up, Operation, Service, And Troubleshooting page 63

Hydronic Heating Control Proportional Gain (HW.P)
This configuration is the proportional term for the PID, which
runs in the HVAC mode LOW HEAT.
Hydronic Heating Control Integral Gain (HW.I)
This configuration is the integral term for the PID, which runs
in the HVAC mode LOW HEAT.
Hydronic Heating Control Derivative Gain (HW.D)
This configuration is the derivative term for the PID, which
runs in the HVAC mode LOW HEAT.
Hydronic Heating Control Run Time Rate (HW.TM)
This configuration is the PID run time rate, which runs in the
HVAC mode LOW HEAT.
Hydronic Heating Logic
If the HVAC mode is LOW HEAT:
• The control will command the supply fan on.
• The control will modulate the hot water or steam coil actu-
ator to the heating control point (Run Status  VIEW 
HT.C.P). The heating control point for hydronic heat is the
heating supply air set point (Setpoints  SA.HT).
If the HVAC mode is HIGH HEAT:
• The control will command the supply fan on.
• The control will command the hot water coil actuator to
100%.
ITEM
HH.CF HYDRONIC HEAT CONFIGS
HW.P
Hydronic Ctl.Prop. Gain
HW.I Hydronic Ctl.Integ. Gain
HW.D Hydronic Ctl.Derv. Gain
HW.TM Hydronic PID Rate Config
ACT.C HYDR.HEAT ACTUATOR CFGS.
SN.1.1 Hydronic Ht.Serial Num.1
SN.1.2
Hydronic Ht.Serial Num.2
SN.1.3 Hydronic Ht.Serial Num.3
SN.1.4 Hydronic Ht.Serial Num.4
C.A.L1 Hydr.Ht.Ctl.Ang Lo Limit
SN.2.1 Humd/HTC2 Ser Num 1
SN.2.2 Humd/HTC2 Ser Num 2
SN.2.3
Humd/HTC2 Ser Num 3
SN.2.4 Humd/HTC2 Ser Num 4
C.A.L2 Humd/HTC2 Ctl Ang Lo Lim
SN.3.1 HTC3 Serial Number 1
SN.3.2 HTC3 Serial Number 2
SN.3.3 HTC3 Serial Number 3
SN.3.4
HTC3 Serial Number 4
C.A.L3 HTC3 Ctrl Angle Lo Limit
SN.4.1 HTC4 Serial Number 1
SN.4.2 HTC4 Serial Number 2
SN.4.3 HTC4 Serial Number 3
SN.4.4 HTC4 Serial Number 4
C.A.L4
HTC4 Ctrl Angle Lo Limit
Table 36 — Hydronic Heat Configuration
EXPANSION
Hydronic Heating PID Process
If the HVAC mode is LOW HEAT, then the hydronic heating
actuator will modulate to the heating control point (Run Sta-
tus  VIEW  HT.C.P). Control is performed with a generic
PID loop where:
Error = Heating Control Point (HT.C.P) – Leaving Air Tem-
perature (LAT)
The PID terms are calculated as follows:
P = K * HW.P * error
I = K * HW.I * error + "I" last time through
D = K * HW.D * (error – error last time through)
Where K = HW.TM/60 to normalize the effect of changing the
run time rate.
NOTE: The PID values should not be modified without ap-
proval from Carrier service personnel.
Freeze Status Switch Logic (Inputs  GEN.I  FRZ.S)
If the freezestat input (FRZ) alarms, indicating that the coil is
freezing, normal heat control is overridden and the following
actions will be taken:
1. Command the hot water coil actuator to 100%.
2. Command the economizer damper to 0%.
3. Command the supply fan on.
RANGE UNITS
0 to 1.5 HW_PGAIN
0 to 1.5 HW_IGAIN
0 to 1.5 HW_DGAIN
15 to 300 sec HOTWPIDR
0 to 9999 HTC1_SN1
0 to 6 HTC1_SN2
0 to 9999 HTC1_SN3
0 to 254 HTC1_SN4
0 to 90 HTC1CALM
0 to 9999 HTC2_SN1
0 to 6 HTC2_SN2
0 to 9999 HTC2_SN3
0 to 254 HTC2_SN4
0 to 90 HTC2CALM
0 to 9999 HTC3_SN1
0 to 6 HTC3_SN2
0 to 9999 HTC3_SN3
0 to 254 HTC3_SN4
0 to 90 HTC3CALM
0 to 9999 HTC4_SN1
0 to 6 HTC4_SN2
0 to 9999 HTC4_SN3
0 to 254 HTC4_SN4
0 to 90 HTC4CALM
63
CCN POINT DEFAULT
1
1
1
90
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0