60
Heating Control
The P Series ComfortLink controls offer control for five differ-
ent types of heating systems to satisfy general space heating re-
quirements: 2-stage gas heat, 2-stage electric heat, multiple-
stage gas heat, modulating gas heat, and hydronic heat. Heat-
ing control also provides tempering and reheat functions.
These functions are discussed in separate sections. Reheat is
discussed under Dehumidification functions on page 88.
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.
Also, for VAV applications, the heat interlock relay (HIR)
function provides the switching of a control signal intended for
use by the VAV terminals. This signal must be used to com-
mand the terminals to open to their Heating Open positions.
The HIR is energized whenever the Heating mode is active, an
IAQ pre-occupied force is active, or if fire smoke modes, pres-
surization, or smoke purge modes are active.
Hydronic heating applications that use the unit’s control re-
quire the installation of a communicating actuator on the hy-
dronic heating coil’s control valve. This actuator (with or with-
out matching control valve) may be separately shipped for field
installation.
All heating systems are available as factory-installed options.
The hydronic 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
display under Configuration
HEAT. See Table 40.
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 either staged gas, modulating gas, SCR
electric, or hydronic heat, this is the supply air set point for
heating.
Occupied Heating Enable (OC.EN)
This configuration only applies when the unit’s control type
(Configuration
UNIT
C.TYP) is configured for 1 (VAV-
RAT) or 2 (VAV-SPT). If the user wants to have the capability
of performing heating throughout the entire occupied period,
then this configuration needs to be set to “YES.” Most installa-
tions do not require this capability, and if heating is installed, it
is used to heat the building up in the morning. In this case, set
OC.EN to “NO.”
NOTE: This unit does not support simultaneous heating and cool-
ing. If significant simultaneous heating and cooling demand is ex-
pected, it may be necessary to provide additional heating or cool-
ing equipment and a control system to provide occupants with
proper comfort.
NOTE: If the user does not relocate this sensor for the 2-stage
electric or gas heating types and is under CCN Linkage, then the
control will send a heating mode (if present) unconditionally to the
linkage coordinator in the CCN zoning system regardless of the
leaving-air temperature.
Table 40 — Heating Configuration
*Some defaults are model number dependent.
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
HEAT HEATING CONFIGURATION
HT.CF Heating Control Type 0 to 5 HEATTYPE 0*
HT.SP Heating Supply Air Setpt 80 to 120 dF SASPHEAT 85
OC.EN Occupied Heating Enabled Yes/No HTOCCENA No
LAT.M MBB Sensor Heat Relocate Yes/No HTLATMON No
SG.CF STAGED HEAT CONFIGS
HT.ST Staged Heat Type 0 to 8 HTSTGTYP 0*
CAP.M Max Cap Change per Cycle 5 to 45 HTCAPMAX 45*
M.R.DB St.Ht DB min.dF/PID Rate 0 to 5 HT_MR_DB 0.5
S.G.DB St.Heat Temp. Dead Band 0 to 5 ^F HT_SG_DB 2
RISE Heat Rise dF/sec Clamp 0.05 to 0.2 HTSGRISE 0.06
LAT.L LAT Limit Config 0 to 20 ^F HTLATLIM 10
LIM.M Limit Switch Monitoring? Yes/No HTLIMMON Yes
SW.H.T Limit Switch High Temp 80 to 210 dF HT_LIMHI 170*
SW.L.T Limit Switch Low Temp 80 to 210 dF HT_LIMLO 160*
HT.P Heat Control Prop. Gain 0 to 1.5 HT_PGAIN 1
HT.D Heat Control Derv. Gain 0 to 1.5 HT_DGAIN 1
HT.TM Heat PID Rate Config 30 to 300 sec HTSGPIDR 90*
HH.CF HYDRONIC HEAT CONFIGS
HW.P Hydronic Ctl.Prop. Gain 0 to 1.5 HW_PGAIN 1
HW.I Hydronic Ctl.Integ. Gain 0 to 1.5 HW_IGAIN 1
HW.D Hydronic Ctl.Derv. Gain 0 to 1.5 HW_DGAIN 1
HW.TM Hydronic PID Rate Config 15 to 300 sec HOTWPIDR 90
ACT.C HYDR.HEAT ACTUATOR CFGS.
SN.1 Hydronic Ht.Serial Num.1 0 to 9999 HTCL_SN1 0
SN.2 Hydronic Ht.Serial Num.2 0 to 6 HTCL_SN2 0
SN.3 Hydronic Ht.Serial Num.3 0 to 9999 HTCL_SN3 0
SN.4 Hydronic Ht.Serial Num.4 0 to 254 HTCL_SN4 0
C.A.LM Hydr.Ht.Ctl.Ang.Lo Limit 0 to 90 HTCLCALM 85
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