Heating Control - Carrier Weathermaster 48P030-100 Controls, Start-Up, Operation, Service, And Troubleshooting

Heating Control

The P Series ComfortLink controls offer control for five different
types of heating systems to satisfy general space heating require-
ments: 2-stage gas heat, 2-stage electric heat, multiple-stage gas
heat, modulating gas heat, and hydronic heat. Heating control also
provides tempering and reheat functions. These functions are dis-
cussed in separate sections. Reheat is discussed under Dehumidifi-
cation functions on page 92.
Variable air volume (VAV) type applications (C.TYP = 1 or 2)
require that the space terminal positions be commanded to open
to minimum heating positions when gas or electric heat systems
are active, to provide for the unit heating system's Minimum
Heating Airflow rate.
VAV type applications (C.TYP = 1 or 2) when the fan SP.CF con-
trol type is duct static pressure control will hold off 2 stage Electric
or 2 stage gas heat for low heat until the VFD speed is greater than
50%. The dampers may control to heat min and max positions un-
der low heat as long as this allows for adequate VFD speed, and
proper heat exchanger temperature rise.
For High heat a VFD speed greater than 70% is required before
the second stage will energize; additionally. The space terminal
damper positions should be commanded to open to maximum
heating positions when both stages of gas or electric heat systems
are active, to provide for the unit heating system's maximum
Heating Airflow rate.
The heat interlock relay (HIR) function provides the switching of
a control signal in High heat intended for use by the VAV termi-
nals. This signal must be used to command the terminals to open
to their max Heating positions. The HIR is energized whenever
the High Heat mode is active, an IAQ pre-occupied force is active,
or if fire smoke modes, pressurization, or smoke purge modes are
active. Modulating heat types will modulate heat in Low heat to a
ITEM
HEAT HEATING CONFIGURATION
HT.CF Heating Control Type
HT.SP Heating Supply Air Setpt
OC.EN Occupied Heating Enabled
LAT.M MBB Sensor Heat Relocate
SG.CF STAGED HEAT CONFIGS
HT.ST Staged Heat Type
CAP.M Max Cap Change per Cycle
M.R.DB St.Ht DB min.dF/PID Rate
S.G.DB St.Heat Temp. Dead Band
RISE Heat Rise dF/sec Clamp
LAT.L LAT Limit Config
LIM.M Limit Switch Monitoring?
SW.H.T Limit Switch High Temp
SW.L.T Limit Switch Low Temp
HT.P Heat Control Prop. Gain
HT.D Heat Control Derv. Gain
HT.TM Heat PID Rate Config
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 Hydronic Ht.Serial Num.1
SN.2 Hydronic Ht.Serial Num.2
SN.3 Hydronic Ht.Serial Num.3
SN.4 Hydronic Ht.Serial Num.4
C.A.LM Hydr.Ht.Ctl.Ang.Lo Limit
NOTE(S):
a. Some defaults are model number dependent.
Table 42 — Heating Configuration
EXPANSION
leaving air setpoint and go to full heat in High heat requiring max-
imum heat airflow as described above.
Also, for VAV applications, the HIR function provides the
switching of a control signal intended for use by the VAV ter-
minals. This signal must be used to command the terminals to
open to their Heating Open positions. The HIR is energized
whenever High Heat is active, an IAQ pre-occupied force is ac-
tive, or if fire smoke modes, pressurization, or smoke purge
modes are active.
Hydronic heating applications that use the unit's control require
the installation of a communicating actuator on the hydronic heat-
ing coil control valve. This actuator (with or without matching
control valve) may be separately shipped for field installation. All
heating systems are available as factory-installed options. The hy-
dronic heating coil may also be field-supplied and field-installed;
the actuator is still required if unit control will be used to manage
this heating sequence.
SETTING UP THE SYSTEM
The essential heating configurations are located at the local dis-
play under Configuration
Heating Control Type (HT.CF)
The heating control types available are selected/configured with
this variable.
0 = No Heat
1 = Electric Heat
2 = 2 Stage Gas Heat
3 = Staged Gas Heat or Modulating Gas Heat
4 = Hydronic Heat
5 = SCR Electric Heat
Heating Supply Air Set Point (HT.SP)
In a low heat mode for staged gas, modulating gas, SCR electric,
or hydronic heat, this is the supply air set point for heating.
RANGE UNITS
0 to 5
80 to 120 dF
Yes/No
Yes/No
0 to 8
5 to 45
0 to 5
0 to 5 ^F
0.05 to 0.2
0 to 20 ^F
Yes/No
80 to 210 dF
80 to 210 dF
0 to 1.5
0 to 1.5
30 to 300 sec
0 to 1.5
0 to 1.5
0 to 1.5
15 to 300 sec
0 to 9999
0 to 6
0 to 9999
0 to 254
0 to 90
63

HEAT. See Table 42.
CCN POINT DEFAULT
HEATTYPE
SASPHEAT
HTOCCENA
HTLATMON
HTSTGTYP
HTCAPMAX
HT_MR_DB
HT_SG_DB
HTSGRISE
HTLATLIM
HTLIMMON
HT_LIMHI
HT_LIMLO
HT_PGAIN
HT_DGAIN
HTSGPIDR
HW_PGAIN
HW_IGAIN
HW_DGAIN
HOTWPIDR
HTCL_SN1
HTCL_SN2
HTCL_SN3
HTCL_SN4
HTCLCALM
0 a
85
No
No
0 a
45 a
0.5
2
0.06
10
Yes
170 a
160 a
1
1
90
a
1
1
1
90
0
0
0
0
85