Daikin Maverick I MPSA07D, Руководство по установке и обслуживанию

Страница: 76 / 94

IM 971-3 • MAVERICK I 76 www.DaikinApplied.com
Controls and Operation
Controls and Operation
Furnace Section Controls and Ignition System
Normal Furnace Operating Sequence
This unit is equipped with a two stage integrated direct spark
ignition control.
Normal Heat Mode
Call For First Stage (Low Fire) Only:
1. Zone thermostat contacts close, a call for first stage (low
fire) heat is initiated.
2. Control runs self check.
3. Control checks the high-limit switch for normally closed
contacts, each pressure switch for normally open
contacts, and all flame rollout switches for continuity.
4. Control energizes each low-fire inducer.
5. Control checks each low-fire pressure switch for closure.
6. If each low-fire pressure switch is closed, the control
starts a 30 second prepurge. If either low-fire pressure
switch is still open after 180 seconds, the high-fire
inducers will be energized until closure.
7. After prepurge time-out, control initiates spark for two
seconds minimum (seven second maximum) ignition
trial, and initiates a 120 second – second stage (high fire)
warm up timing.
8. Control detects flame, de-energizes spark and initiates
45 second delay on blower timing.
9. After a fixed 45 seconds indoor blower delay on, the
control energizes the indoor blower.
10. After a fixed 120 seconds second stage warm-up period,
control checks thermostat input. If only W1 is called for,
W2 is de-energized and the control starts a 30 second
OFF delay on the W2 inducer.
11. After fixed 30 seconds the W2 inducer is de-energized.
12. Control enters normal operating loop where all inputs are
continuously checked.
13. Zone thermostat is satisfied.
14. Control de-energizes gas valve.
15.
Control senses loss of flame.
16. Control initiates five second inducer postpurge and 90
second indoor blower delay off.
17. Control de-energizes inducer blower.
18. Control de-energizes indoor blower.
19. Control in the stand by mode with solid red LED.
Call For Second Stage, After First Stage
Established; Starting from A .11:
1. If a call for second stage (high fire) is initiated after a call
for first stage heat is established, the control energizes
the W2 inducer and energizes the second stage of the
gas valve.
2. Control enters normal operating loop where all inputs are
continuously checked.
Second Stage Satisfied; First Stage Still Called For;
Starting From B .3:
1. Once the call for second stage is satisfied, the control
starts a 30 second OFF delay on W2 inducer and
reduces the gas valve to first stage.
2. Control enters normal operating loop where all inputs are
continuously checked.
First Stage Satisfied:
1. Zone thermostat is satisfied.
2. Control de-energizes gas valve.
3.
Control senses loss of flame.
4. Control initiates five second inducer postpurge and 90
second indoor blower delay OFF.
5. Control de-energizes inducer blower.
6. Control de-energizes indoor blower.
7. Control in the stand by mode with solid red LED.
First Stage and Second Stage Called
Simultaneously:
1. Zone thermostat contacts close, a call for first stage (low
fire) and second stage (high fire) heat is initiated.
2. Control runs self check.
3. Control checks the high-limit switch for normally closed
contacts, each pressure switch for normally open
contacts, and all flame rollout switches for continuity.
4. Control energizes each low-fire inducer.
5. Control checks each pressure switch for closure.
6.
If each low-fire pressure switch is closed, the control
starts a 30 second prepurge. If either switch is still
open after 180 seconds, the high-fire inducers will be
energized until closure.
7. After prepurge time-out, control initiates spark for two
seconds minimum (seven seconds maximum) ignition
trial, and initiates a 120 second stage warm up timing.
8. Control detects flame, de-energizes spark and starts a
45 second indoor blower delay on timing.