Manual 2100-647D
Page
19 of 36
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
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.
Terminal
Description
Use
Revision "2"
Reference
1
Compressor on Output Signal from Jade to MV
Economizer Only
"A"
2
24VAC HOT
from Terminal 2 Connected to Unit Transformer
24V HOT
"R"
3
24VAC COMMON
from Unit Transformer to MV
24V COMMON
"C"
4
Unit Compressor Operation
Cooling Operation
"Y"
5
Close Damper Input (Close Blade 100%)
Economizer Only
"F"
6
Electric Heat On Operation, Stage 1 and 2
Heating Operation
"W1"
7
1st Stage Cooling Input, 1st Stage Cooling Signal to Jade
Economizer Only
"Y1"
8
2nd Stage Cooling Input, 2nd Stage Cooling Signal to Jade
Economizer Only
"Y2"
9
Blower Operation (Indoor Blower On)
Blower Operation
"G"
10
Filter Switch Normally Closed Dry Contacts
Alarm Signal
"4"
11
Filter Switch Normally Closed Dry Contacts
Alarm Signal
"5"
12
Blade Switch Delay Relay Normally Closed Dry Contacts
Economizer Only
"8"
13
Blade Switch Delay Relay Normally Closed Dry Contacts
Economizer Only
"9"
14
Occupied Signal Input, Econ Emergency Open (Open Blade 100%)
Economizer Only
"E"
15
Econ Open Output (
6V HOT, 24V HOT
after Blade Open 100% and delay)
Economizer Only
"10"
16
Alarm Relay Common Dry Contact
Comp Alarm Signal
"3"
17
Alarm Relay Normally Open Dry Contact
Comp Alarm Signal
"2"
18
Alarm Relay Normally Closed Dry Contact
Comp Alarm Signal
"1"
19
24VAC HOT
to Terminal 2 from Unit Transformer Through Smoke Alarm
Jumper Wire*
24V HOT
"RT"
20
2nd Stage Heating On Operated Through Jumper to Terminal 6
Heating Operation,
2nd Stage
"W2'
21
Blade Switch Terminal
24V HOT
When Blade is Open, Sends Signal from
Switch to Delay Relay
Economizer Only
"7"
TABLE 1
Sequence of Operation
* 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.
