Bard Q24A1 Manual Do Utilizador
Manual 2100-522B
Page
Page
34 of 38
OPTIONAL CLIMATE CONTROLS
SEQUENCE OF OPERATION
SEQUENCE OF OPERATION
The Climate Control Option A is an electronic, non-
programmable manual or auto changeover thermostat.
The thermostat may be manually set to heat or cool
mode. The thermostat will maintain the temperature set
on the thermostat in the mode in which it is set.
programmable manual or auto changeover thermostat.
The thermostat may be manually set to heat or cool
mode. The thermostat will maintain the temperature set
on the thermostat in the mode in which it is set.
The Climate Control Option D is an electronic,
programmable thermostat. The thermostat can be set in
the heat, cool or automatic mode. When the thermostat
is sent in the heat mode, it can heat only to maintain the
temperature set on the thermostat. When the thermostat
is set in the cool mode, it can cool only to maintain the
temperature set on the thermostat. When the thermostat
is set in the automatic mode, the thermostat can change
automatically to the heat or cool modes to maintain the
temperature set on the thermostat.
programmable thermostat. The thermostat can be set in
the heat, cool or automatic mode. When the thermostat
is sent in the heat mode, it can heat only to maintain the
temperature set on the thermostat. When the thermostat
is set in the cool mode, it can cool only to maintain the
temperature set on the thermostat. When the thermostat
is set in the automatic mode, the thermostat can change
automatically to the heat or cool modes to maintain the
temperature set on the thermostat.
The Climate Control Option “H” is an electronic,
programmable thermostat and a CO
programmable thermostat and a CO
2
controller. The
thermostat can be set in the heat, cool or automatic
mode. When the thermostat is set in the heat mode, it
can heat only to maintain the temperature set on the
thermostat. When the thermostat is set in the cool
mode, it can cool only to maintain the temperature set
on the thermostat. When the thermostat is set in the
automatic mode, the thermostat can change
automatically to the heat or cool modes to maintain the
temperature set on the thermostat.
mode. When the thermostat is set in the heat mode, it
can heat only to maintain the temperature set on the
thermostat. When the thermostat is set in the cool
mode, it can cool only to maintain the temperature set
on the thermostat. When the thermostat is set in the
automatic mode, the thermostat can change
automatically to the heat or cool modes to maintain the
temperature set on the thermostat.
The CO
2
controller will energize the vent option and the
ID blower when the room CO
2
levels rise over set level.
Default CO
2
set point is 1000 ppm. See Figure 23.
PRESSURE SERVICE PORTS
High and low pressure service ports are installed on all
units so that the system operating pressures can be
observed. Pressure curves can be found later in the
manual covering all models on both cooling and heating
cycles. It is imperative to match the correct pressure
curve to the unit by model number. Upper and lower
service doors must be attached to obtain proper reading.
units so that the system operating pressures can be
observed. Pressure curves can be found later in the
manual covering all models on both cooling and heating
cycles. It is imperative to match the correct pressure
curve to the unit by model number. Upper and lower
service doors must be attached to obtain proper reading.
SEQUENCE OF OPERATION
Cooling – Circuit R-Y makes the thermostat pull in the
compressor contactor starting the compressor and
outdoor motor. The G (indoor motor) circuit is
automatically completed on any call for cooling
operation, or can be energized by manual fan switch on
subbase for constant air circulation.
compressor contactor starting the compressor and
outdoor motor. The G (indoor motor) circuit is
automatically completed on any call for cooling
operation, or can be energized by manual fan switch on
subbase for constant air circulation.
Heating – Circuit is completed for R-W1 on each
heating “on” cycle, energizing the electric heat
contactor. R-G also makes starting indoor blower
motor.
heating “on” cycle, energizing the electric heat
contactor. R-G also makes starting indoor blower
motor.
Second stage heat – Energized circuit R-W2 and the
electric heat contactor for the second bank of heaters (if
equipped) is energized.
electric heat contactor for the second bank of heaters (if
equipped) is energized.
High / Low Pressure control provides protection for the
compressor. In the advent system pressures go above
600 PSI or below 15 PSI in cooling mode the
compressor will be stopped. This will activate the red
light located in the control panel. The lockout circuit
will hold compressor off line. When the system
problem is corrected, the unit operation can be restored
by turning of the main power supply off and then back
on, or reset the room thermostat. The low pressure
control has a bypass to eliminate nuisance lockout on
cold start up. Factory set to 2 minutes.
compressor. In the advent system pressures go above
600 PSI or below 15 PSI in cooling mode the
compressor will be stopped. This will activate the red
light located in the control panel. The lockout circuit
will hold compressor off line. When the system
problem is corrected, the unit operation can be restored
by turning of the main power supply off and then back
on, or reset the room thermostat. The low pressure
control has a bypass to eliminate nuisance lockout on
cold start up. Factory set to 2 minutes.
FIGURE 23
CO
2
CONTROLLER – FACTORY SET TO 1000
PPM
"SW1" SET TO ON
"OUT" SET TO 20-100%
"SW2" SET TO ON
OF
F
ON
ON
OF
F
0-100% 20-100%
VO
LT
AG
E
CURRE
NT
SW2SW1OUT AN
"AN" SET TO VOLTAGE
MIS-2667