Bedienungsanleitung Carrier 48 50PG C03-14 (Seite 22 von 188) (Englisch)

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Space Sensor Control

Space sensor staging control is an adaptive anticipation control that

weighs the actual space demand against the trend of that demand.

It also honors stage time guards and supply air limits. The demand

for heating in the space is displayed as the Heating Demand (Run

Status→HEAT→DMD.H). The control tries to anticipate the

change in the space because of its current stage status. This

anticipation is based on the Heat Demand Trend (Operating Modes

→HEAT→TRD.H). This trend will show the control how the

space is reacting to the current running conditions and help it

decide when to add or remove one stage from the requested stages.

The Heat Stage Increase Time (Configuration→HEAT→H.INC)

or the Heat Stage Decrease Time (Configuration→HEAT

→H.DEC) has to expire before another stage can be added or a

stage can be subtracted. If at any time the Supply−Air Temperature

(SAT) rises above the Maximum Supply Air Temperature Lower

Level (Configuration→HEAT→SAT→SAM.L), the requested

stages will not be allowed to increase. If at any time the SAT rises

above the Maximum Supply Air Temperature Upper Level

(Configuration→HEAT→SAT→SAM.U), the requested stages

will be reduced by one without honoring H.DEC.

Heat Relay Control

The heat relay control is responsible for energizing or

de−energizing the MBB’s heat stage relays and works hand in hand

with the staging control. As the staging control requests stages, the

heat relay control determines what actual heat relays are available

or energized and tries to provide stages for what is requested. The

availability of a heat relays depends on heat being installed, how

many stages, and time guards. The type of Heat Installed

(Configuration→HEAT→HT.TY) must be set for gas or electric

for any stages to be available. The Number of Heat Stages

(Configuration→HEAT→N.HTR) configuration tells the control

how many heat relays can be used. Heat Stage 1Timeguard (Run

Status→HEAT→TG.H1) and Heat Stage 2 Timeguard (Run

Status→HEAT→TG.H2) display the time a respective heat relay

has before it is available for use. The available stages at any given

time are displayed as Available Heating Stages (Run Status

→HEAT→AVL.H). The actual heat relays on at any given time

are displayed as Actual Heating Stages (Operating Modes→HEAT

→ACT.H). Heat Stage 1 Relay (Run Status→HEAT→HT.1) and

Heat Stage 2 Relay (Run Status→HEAT→HT.2) are displayed on

when the respective relay is energized. There are time guards to

protect from short cycling, Heat Minimum On Time

(Configuration→HEAT→MRT.H) and Heat Minimum Off Time

(Configuration→HEAT→MOT.H) apply before a heat relay can

be turned back on or turned off.

Integrated Gas Controller (IGC)

The heat staging is determined as described above and the

Integrated Gas Controller (IGC) initiates the gas heat module

start−up. The Integrated Gas Controller (IGC) minimum on−time

of 1 minute will be followed even if Heat Minimum On Time

(Configuration→HEAT→MRT.H) is lower and during Service

Test. If the IGC temperature limit switch opens within 10 minutes

of the end of the gas heat cycle, the next fan off delay will be

extended by 15 seconds. The maximum delay is 3 minutes. Once

modified by the IGC, the fan off delay will not change back to the

configured Fan−off Delay, Gas Heat (Configuration→HEAT

→FOD.G) unless power is reset to the control. A light emitting

diode (LED) is provided on the IGC to indicate status. During

normal operation the LED is continuously on. See the

Troubleshooting section if the LED is off or flashing. The IGC is

located behind the gas section access panel door.

When the control energizes Heat Stage 1 Relay (Run Status

→HEAT→HT.1), power is sent to the W terminal on the IGC

board. A check is made to ensure that the rollout switch and limit

switch are closed. The induced−draft motor is then energized, and

when speed is proven with the Hall Effect sensor on the motor, the

ignition activation period begins. The burners will ignite within 5

seconds. If the burners do not light, there is a 22−second delay

before another 5−second attempt. If the burners still do not light,

this sequence is repeated for 15 minutes. After the 15 minutes have

elapsed, if the burners still have not lit, heating is locked out. The

control will reset when the request for heat is temporarily removed.

When ignition occurs, the IGC board will continue to monitor the

condition of the rollout switch, limit switches, the Hall Effect

sensor, as well as the flame sensor. If the unit is controlled through

a room thermostat or space sensor set for fan auto, 45 seconds after

ignition occurs the indoor−fan motor will be energized (and the

outdoor−air dampers will open to their minimum position). If for

some reason the over temperature limit opens prior to the start of

the indoor fan blower, on the next attempt, the 45−second delay

will be shortened to 5 seconds less than the time from initiation of

heat to when the limit tripped. Gas will not be interrupted to the

burners and heating will continue. Once modified, the fan on delay

will not change back to 45 seconds unless power is reset to the

control. When the control energizes Heat Stage 2 Relay (Run

Status→HEAT→HT.2), power is supplied to the second stage of

the main gas valve. If both stage 1 and stage 2 of the gas valve

close, gas will be turned off to the main burners.

48/50PG and PM

Carrier 48 50PG C03-14 Seite 22

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