Table 1 Sequence Of Operation - Bard H42AA-B Installation Instructions Manual

Terminal
1 Compressor on Output Signal from Jade to MV
2 24VAC HOT from Terminal 2 Connected to Unit Transformer
3 24VAC COMMON from Unit Transformer to MV
4 Unit Compressor Operation
5 Close Damper Input (Close Blade 100%)
6 Electric Heat On Operation, Stage 1 and 2
7 1st Stage Cooling Input, 1st Stage Cooling Signal to Jade
8 2nd Stage Cooling Input, 2nd Stage Cooling Signal to Jade
9 Blower Operation (Indoor Blower On)
10 Filter Switch Normally Closed Dry Contacts
11 Filter Switch Normally Closed Dry Contacts
12 Blade Switch Delay Relay Normally Closed Dry Contacts
13 Blade Switch Delay Relay Normally Closed Dry Contacts
14 Occupied Signal Input, Econ Emergency Open (Open Blade 100%)
15 Econ Open Output (6V HOT, 24V HOT after Blade Open 100% and delay)
16 Alarm Relay Common Dry Contact
17 Alarm Relay Normally Open Dry Contact
18 Alarm Relay Normally Closed Dry Contact
24VAC HOT to Terminal 2 from Unit Transformer Through Smoke Alarm
19
Jumper Wire*
20 2nd Stage Heating On Operated Through Jumper to Terminal 6
Blade Switch Terminal 24V HOT When Blade is Open, Sends Signal from
21
Switch to Delay Relay
* Replace jumper wire with smoke alarm connections to interrupt 24VAC unit power if smoke alarm is used in shelter. Jumper can also
be removed to break 24VAC power to unit.
Adjustable Delay-on-Make and Delay-on-Break Timer
On initial power up and any time power is interrupted
to the unit, the delay-on-make period begins, which is
the time set on the potentiometer (delay-on-break time)
plus 10% of the delay-on-break setting (delay-on-break
factory default is 2 minutes). When the delay-on-
make period is complete and the high pressure switch
and low pressure switch are closed, the compressor
contactor is energized. Upon shutdown (end of the
call for cooling), the delay-on-break timer starts and
prevents restart (next call for cooling) until the delay-
on-break period has expired.
During routine operation of the unit with no power
interruptions, the compressor will operate on demand
with no delay.
High Pressure Switch and Lockout Sequence
If the high pressure switch opens, the compressor
contactor will de-energize immediately. The lockout
timer will go into a soft lockout and stay in soft lockout
until the high pressure switch closes and the delay-on-
break time has expired. If the high pressure switch
TABLE 1
Sequence of Operation
Description
opens again in this same operating cycle, the unit will go
into manual lockout condition and the alarm relay circuit
will energize. Recycling the wall thermostat or main
power resets the manual lockout.
Low Pressure Switch, Bypass and Lockout Sequence
If the low pressure switch opens for more than 120
seconds, the compressor contactor will de-energize and
go into a soft lockout. Regardless the state of the low
pressure switch, the contactor will re-energize after
the delay-on-make time delay has expired. If the low
pressure switch remains open, or opens again for longer
than 120 seconds, the unit will go into manual lockout
condition and the alarm relay circuit will energize.
Recycling the wall thermostat or main power resets the
manual lockout.
Alarm Relay Output
Alarm terminal is the output connection for
applications where an alarm relay is employed. This
terminal is powered whenever the compressor is locked
out due to HPC or LPC sequences as described above.
Revision "2"
Use
Reference
Economizer Only
24V HOT
24V COMMON
Cooling Operation
Economizer Only
Heating Operation
Economizer Only
Economizer Only
Blower Operation
Alarm Signal
Alarm Signal
Economizer Only
Economizer Only
Economizer Only
Economizer Only
Comp Alarm Signal
Comp Alarm Signal
Comp Alarm Signal
24V HOT
Heating Operation,
2nd Stage
Economizer Only
Manual 2100-647D
Page
"A"
"R"
"C"
"Y"
"F"
"W1"
"Y1"
"Y2"
"G"
"4"
"5"
"8"
"9"
"E"
"10"
"3"
"2"
"1"
"RT"
"W2'
"7"
19 of 36