Carrier 50EJQ Información técnica descargar pdf (Pagina 12)

Submaster Gain is calculated as:

SubGain = (OAT − TEMPBAND)/(ESG + 1);

SubGain is ﬁxed between ESG and −1. The commanded

position is calculated as:

ECONPOS = SubGain x (ECONSR − SAT) + CTRVAL

5. The ECONPOS is ﬁxed between Minimum and Maxi-

mum Economizer Positions. Maximum Position is 100%

under normal conditions. When ‘‘rate limiting’’ is in

effect under low ambient conditions, the Maximum Po-

sition is held to 1% above the last ECONPOS for 4 sec-

onds. This results in dampers opening slowly. Similarly,

Minimum Position is IQMP under normal conditions,

and is lowered by 1% every 4 seconds during ‘‘rate

limiting.’’

6. If the new calculated ECONPOS is varied from the last

Economizer Position by less than ECONBAND, it will

ignore the new value and the dampers do not move.

Heating Control (CCN and Remote Start/Stop

Only)

HEATING CONTROL (Version 1.0 and 2.0 of the Control

Software)

Heating Control Master Loop — The Heating Control Mas-

ter Loop inputs and outputs are shown in Tables 13 and 14.

Table 13 — Heating Control Master Loop Inputs

(Version 1.0 and 2.0 of the Control Software)

INPUTS TYPE

Unit Type User Conﬁgured

Current Mode Internal Parameter

Fan State Internal Parameter

Occupied Status Internal Parameter

Space Temperature (SPT) Analog Input

Return-Air Temperature

(RAT)

Analog Input

Occupied Heating Option

(OHEN)

User Conﬁgured, default disabled

Occupied Heating Set Point

(OHSP)

User Conﬁgured, default = 68 F

Space Temperature Offset

(STO)

Analog Input

Morning Warm-up Status Internal Parameter

SAT Reset Internal Parameter

LEGEND

SAT — Supply-Air Temperature

Table 14 — Heating Control Master Loop Outputs

(Version 1.0 and 2.0 of the Control Software)

OUTPUTS TYPE

SHSR Submaster Reference Desired Supply-Air Temperature

Constant Volume Units — Heating will maintain space tem-

perature at the unoccupied heat set point during unoccupied

periods, or occupied heat set point during occupied periods.

Variable Air Volume Units — Heating control will maintain

return-air temperature at occupied heat set point under the

following conditions:

• Units with space thermistor: unit is started during the un-

occupied period by the DDC control due to space tem-

perature falling below the unoccupied heat set point.

• Unit is in morning warm-up mode: see Temperature Com-

pensated Start section on page 18.

• Unit has Occupied Heating enabled: heating control will

maintain return-air temperature at occupied heat set point

during occupied periods.

Qualifying Conditions — When all of the following condi-

tions are met, the submaster reference is calculated, other-

wise it is set to its minimum value:

• Indoor fan has been ON for 30 seconds.

• Cool mode is NOT active.

• Occupied, Temperature Compensated Start, or Heat mode

is active.

• VAV units: RAT reading is available.

CV units: SPT reading is available.

• VAV units: Unoccupied mode, Morning Warm-Up or OHEN

option enabled and RAT<OHSP − SAT Reset.

Sequence of Operation — The Staged Heat Submaster Ref-

erence (SHSR) is calculated as follows:

SHSR = PID function on (error term)

For CV units:

error term = OHSP + STO − (SAT Reset)

− Space Temperature

For VAV units:

error term = OHSP − (SAT Reset)

− Return-Air Temperature

Morning Warm-Up (VAV Only) — Morning warm-up is a

condition in VAV systems that occurs when the temperature

compensated start algorithm has calculated a biased occu-

pied start time, and the unit has a heating demand (i.e., RAT

< occupied heating set point). The Linkage mode warm-up

will be transmitted to the Linkage Supervisory POC device

to support DAV. The warm-up will continue into the occu-

pied period as long as there is a need for heat. During warm-

up, the unit can continue heating into the occupied period,

even if occupied heating is disabled. When the heating de-

mand is satisﬁed, the warm-up condition will terminate.

HEATING CONTROL (Version 3.0 Software)

Heating Control Master Loop — The Heating Control Mas-

ter Loop inputs and outputs are shown in Tables 15 and 16.

Table 15 — Heating Control Master Loop Inputs

(Version 3.0 Software)

INPUTS TYPE

Unit Type User Conﬁgured

Current Mode Internal Parameter

Fan State Internal Parameter

Occupied Status Internal Parameter

Occupied Heating Option

for VAV

DIP switch no. 5

Morning Warm-Up Status Internal Parameter

Space Temperature (SPT) Analog Input

Return-Air Temperature (RAT) Analog Input

Occupied Heating Set Point

(OHSP)

User Conﬁgured, default = 68 F

Space Temperature Offset

(STO)

Analog Input

LEGEND

VAV — Variable Air Volume

Table 16 — Heating Control Master Loop Outputs

(Version 3.0 Software)

OUTPUTS TYPE

SHSR Submaster Reference Desired Supply-Air Temperature

LEGEND

SHSR — Staged Heat Submaster Reference

Constant Volume/Heat Pump Units — Heating will maintain

space temperature at unoccupied heat set point during un-

occupied periods, or occupied heat set point during occu-

pied periods.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 43 44

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