89
SETTING UP THE SYSTEM
The settings for dehumidification can be found at the local dis-
play at Configuration
DEHU. See Table 70.
Dehumidification Configuration (D.SEL)
The dehumidification configuration can be set for the follow-
ing settings (see Table 71):
• D.SEL = 0 — No dehumidification and reheat.
• D.SEL = 1 — The control will perform both dehumidifica-
tion and reheat with modulating valve (hydronic).
• D.SEL = 2 — The control will perform dehumidification
and reheat with staged gas only.
• D.SEL = 3 — The control will perform both dehumidifica-
tion and reheat with third party heat via an alarm relay. In
the case of D.SEL=3, during dehumidification, the alarm
relay will close to convey the need for reheat. A typical ap-
plication might be to energize a 3-way valve to perform
hot gas reheat.
• D.SEL = 4 — The control will use the Humidi-MiZer
®
adaptive dehumidification system.
• D.SEL = 5 — The unit will operate in dehumidification
mode (Venting Dehum, Cooling Dehum) but without any
reheat. The unit leaving air temperature will be equal to the
Dehum Cool Setpoint (DHCOOLSP) during both the
Venting Dehum and Cooling Dehum modes. This may re-
sult in over cooling of the conditioned space. With this
configuration, if the unit control attempts to go into Heat-
ing Dehum, the dehumidification function will shut off and
only heating mode will be active.
Dehumidification Sensor (D.SEN)
The sensor can be configured for the following settings:
• D.SEN = 1 — Initiated by return air relative humidity sensor.
• D.SEN = 2 — Initiated by space relative humidity sensor.
• D.SEN = 3 — Initiated by discrete input.
Economizer Disable in Dehum Mode (D.EC.D)
This configuration determines economizer operation during
Dehumidification mode.
• D.EC.D = YES — Economizer disabled during dehumidi-
fication (default).
• D.EC.D = NO — Economizer not disabled during
dehumidification.
Vent Reheat Set Point Select (D.V.CF)
This configuration determines how the vent reheat set point is
selected.
• D.V.CF = 0 — Reheat follows an offset subtracted from
return air temperature (D.V.RA).
• D.V.CF = 1 — Reheat follows a dehumidification heat set
point (D.V.HT).
Vent Reheat RAT Offset (D.V.RA)
Set point offset used only during the vent mode. The air will be
reheated to return-air temperature less this offset.
Vent Reheat Set Point (D.V.HT)
Set point used only during the vent mode. The air will be re-
heated to this set point.
Dehumidify Cool Set Point (D.C.SP)
This is the dehumidification cooling set point.
Table 70 — Dehumidification Configuration
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
DEHU DEHUMIDIFICATION CONFIG.
D.SEL Dehumidification Config 0 to 4 DHSELECT 0
D.SEN Dehumidification Sensor 1 to 3 DHSENSOR 1
D.EC.D Econ disable in DH mode? Yes/No DHECDISA Yes
D.V.CF Vent Reheat Setpt Select 0 to 1 DHVHTCFG 0
D.V.RA Vent Reheat RAT offset 0 to 8 deltaF DHVRAOFF 0
D.V.HT Vent Reheat Setpoint 55 to 95 dF DHVHT_SP 70
D.C.SP Dehumidify Cool Setpoint 40 to 55 dF DHCOOLSP 45
D.RH.S Dehumidify RH Setpoint 10 to 90 % DHRELHSP 55
HZ.RT Humidi-MiZer Adjust Rate 5 to 120 sec HMZRRATE 30
HZ.PG Humidi-MiZer Prop. Gain 0 to 10 HMZR_PG 0.8
DH.DB Dehumidify RH Deadband 1 to 30 % DHSENSDB 5
DH.TG Dehumidification Discrete Timeguard 10 to 90 seconds DHDISCTG 30
Table 71 — Dehumidification Heat Source Dependency upon Heating Stages
HT.CF (HEATTYPE)
Heating provided by the system
HT.ST
HTSTGTYP
D.SEL (DHSELECT)
Selected Heat for Dehum
DEHUM
ALLOWED
REHEAT
ALLOWED
0–5 any N/A 0 None No No
0–5 any N/A 4 Humidi-MiZer
®
Yes Yes
0–5 any N/A 5 Dehum without reheat Yes No
0 No heat N/A 3 3rd party heat Yes Yes
1 2-stage electric heat N/A 5 Dehum without reheat Yes No
2 2-stage gas heat 0 5 Dehum without reheat Yes No
3 Staged or mod gas heat 0–5 2 Stage or mod gas Yes Yes
4 Hydronic N/A 1 Hydronic Yes Yes
5 SCR electric 6, 7, 8 5 Dehum without reheat Yes No
LEGEND
DHSELECT — Dehumidification Heat Source
HEATTYPE — Heating Type
HTSTGTYP — Heating Stage Type
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