18
Heat Setpoint In Effect (EFF.H)
This shows the actual setpoint that is being used for control during
heating mode. If a 0 is displayed, then space sensor control is not
being used and the unit is being controlled by a thermostat.
Currently Occupied (OCC)
Displays the current state of assumed space occupancy based
on unit configuration and inputs.
T med Override in Effect (T.OVR)
Displays if the state of occupancy is currently occupied due to
an override.
Linkage Active (LINK)
Displays if a linkage communication “Linkage” is established
between the unit and a linkage source.
Demand Limit in Effect (D.LMT)
Displays if a demand limit has been placed on the unit’s capacity.
Compressor OAT Lockout (C.LOC)
Displays if operation of one or more compressors is prevented
due to outdoor temperature limit lockout.
Heat OAT Lockout (H.LOC)
Displays if heating operation is prevented due to outdoor tem-
perature limit lockout.
Econo Cool OAT Lockout (E.LOC)
Displays if economizer operation for cooling is prevented due
to outdoor temperature limit lockout.
General Operation
48/50HC units can provide cooling, dehumidification, heating,
and ventilation operation. Each unit will operate under one of
two basic types of control: thermostat or space temperature
sensor. There are many inputs, configurations, safety factors,
and conditions that ultimately control the unit. Refer to the spe-
cific operation sections for detail on a specific unit operation.
When thermostat control is enabled (
Configura-
tion
UNIT
U.CTL = 1
), the unit will operate based on dis-
crete input commands (G, Y1, Y2, W1, and W2) and there is a
one minute time delay between modes and when re-entering a
mode. The G command calls for ventilation, the Y1 and Y2
commands call for cooling, and the W1 and W2 commands
call for heating. Thermostat Control Type (
Configura-
tion
UNIT
T.CTL
) affects how cooling operates based on
Y1 and Y2 commands and if cooling/heating stage time guards
are applied.
When space temperature sensor control is enabled (
Configura-
tion
UNIT
U.CTL = 2
), the unit will try to maintain the Space
Temperature (
Temperatures
AIR.T
SPT
) between the effec-
tive cool and heat setpoints (
Run Status
MODE
EFF.C
and
EFF.H
). However, to minimize unnecessary cool to heat and heat
to cool changes, there is a 10 minute delay after the last stage turns
off before the control will switch modes and a 1 minute delay
when re-entering the last mode. Linkage operation overrides the
mode changeover delay to 15 seconds. The cooling and heating
Mode Select Timeguard (
Operating Modes
COOL
MS.TG
and
Operating Modes
HEAT
MS.TG
) show the remaining
time before allowing the respective mode to be entered.
Temperature Setpoint Determination
Setpoints are used to control the unit while under space tem-
perature sensor control. The Cool Setpoint in Effect (
EFF.C
)
and the Heat Setpoint in Effect (
EFF.H
) are the points in
which the unit is controlling to at a specific time. These points
are read only points and change according to occupancy, the
offset slider status, and network writes (Linkage or LON).
If the building is in occupied mode, the Occupied Cool Set-
point (
Setpoints
OCSP
) and the Occupied Heat Setpoint
(
Setpoints
OHSP
) are active. When the building is in unoc-
cupied mode, the Unoccupied Cool Setpoint (
Set-
points
UCSP
) and the Unoccupied Heat Setpoint (
Set-
points
UHSP
) are active. The heating and cooling set points
are also separated by a Heat-Cool Set Point Gap (
Set-
points
GAP
) that is user configurable from 2 to 10 degrees F.
This parameter will not allow the setpoints to be set too close
together, it will change the last setpoint adjusted if it is set
within the GAP.
When the space sensor has a setpoint slider adjustment, the
cool and heat setpoints (occupied) can be offset by sliding the
bar from one side to the other. The SPT Offset Range (+/-)
(
Setpoints
STO.R
) sets the total positive or negative degrees
that can be added to the setpoints. With the slider in the middle,
no offset is applied. Moving the slider to the “COOL” side will
subtract from each setpoint, and sliding it to the “WARM” side
will add to the setpoints. The slider offset being applied at any
given time is displayed as Space Temperature Offset (
Tem-
peratures
AIR.T
SPTO
).
Occupancy Determination
The building’s occupancy is affected by a number of different
factors. When the unit is operating with a space temperature
sensor (T-55, T-56, T-58 or T-59), occupancy affects the unit
set points and the operation of the economizer. If the unit is op-
erating under thermostat control, occupancy only affects the
operation of the economizer. If the unit’s Humidi-MiZer sys-
tem is being controlled by a relative humidity sensor, then oc-
cupancy will affect the RH setpoints. The factors affecting oc-
cupancy are listed below from highest to lowest priority.
LEVEL 1 PRIORITY
Level 1 classification is a force/write to occupancy and can oc-
cur three ways. Listed in order of priority: force on OCCU-
PIED, a write to NVI_OCC, and a Linkage write. The CCN
point OCCUPIED is forced via an external device such as a
ComfortID controller or a service tool. When OCCUPIED is
forced to YES, the unit is considered occupied, when OCCU-
PIED is forced to NO, the unit is considered unoccupied. If the
third party protocol LON is writing to NVI_OCC, the control
maps it to OCCUPIED as an input. If the unit is being con-
trolled by Linkage, the occupancy is communicated and
mapped to OCCUPIED as an input. LON and Linkage do not
force the point, only write to it, therefore a force applied to
OCCUPIED will override them.
If OCCUPIED is not being forced or written to, proceed to the
level 2 priority.
LEVEL 2 PRIORITY
Remote Occupancy Switch should be configured to either Nor-
mally Open or Normally Closed when the user would like to
control the occupancy with an external switch. This switch is
field-supplied (24v, single pole, single throw [SPST]). There
are three possible configurations for the remote occupancy
switch:
1. (
Configuration
UNIT
RM.SW = 0
) No Switch
2. (
Configuration
UNIT
RM.SW = 1
) Normally Open
Switch
3. (
Configuration
UNIT
RM.SW = 2
) Normally Closed
Switch
If the switch is configured to No Switch (0), the switch input
value will be ignored and software will proceed to level 3 pri-
ority. For each type of switch, the appropriate configuration
and states are listed in the table below. The Remote Occupancy
Switch (
INPUTS
GEN.I
RM.OC
) point will show the sta-
tus of the switch.
Содержание /50HC 04-28
Страница 61: ...61 Fig 21 Saturated Condensing Temperature Thermistor Location 48 50HC 14 SCT B SCT A CIRCUIT B CIRCUIT A ...
Страница 69: ...69 Fig 24 Typical Control Diagram for 48HC 04 14 Units 48HC 08 09 shown ...
Страница 70: ...70 Fig 25 Typical Power Diagram for 48HC 04 14 Units 48HC 08 09 shown ...
Страница 71: ...71 Fig 26 Typical Control Diagram for 50HC 04 14 Units 50HC 14 shown ...
Страница 72: ...72 Fig 27 Typical Power Diagram for 50HC 04 14 Units 50HC 14 Non Humidi MiZer shown ...
Страница 73: ...73 Fig 28 Typical Control Diagram 48HC 17 28 Units ...
Страница 74: ...74 Fig 29 Typical Control Diagram 50HC 17 28 Units ...
Страница 75: ...75 Fig 30 Typical Humid MiZer Power Diagram and Component Arrangement 48 50HC 17 28 Units ...
Страница 76: ...76 Fig 31 Typical Non Humid MiZer Power Diagram and Component Arrangement 48 50HC 17 28 Units ...
Страница 89: ...89 Fig 42 Modulating ERV Wiring Schematic ...
Страница 90: ...90 Fig 43 EnergyX ERV Control Box Component Layouts ...
Страница 101: ...101 Fig 59 Exhaust Fan Assembly Removal Exhaust Fan Assembly ...
Страница 141: ......