Bard H42AA-B Installation Instructions Manual

Bard H42AA-B Installation Instructions Manual Manual pdf 19 page image

Manual 2100-647DPage 19 of 36Adjustable Delay-on-Make and Delay-on-Break TimerOn initial power up and any time power is interruptedto the unit, the delay-on-make period begins, which isthe time set on the potentiometer (delay-on-break time)plus 10% of the delay-on-break setting (delay-on-breakfactory default is 2 minutes). When the delay-on-make period is complete and the high pressure switchand low pressure switch are closed, the compressorcontactor is energized. Upon shutdown (end of thecall for cooling), the delay-on-break timer starts andprevents restart (next call for cooling) until the delay-on-break period has expired.During routine operation of the unit with no powerinterruptions, the compressor will operate on demandwith no delay.High Pressure Switch and Lockout SequenceIf the high pressure switch opens, the compressorcontactor will de-energize immediately. The lockouttimer will go into a soft lockout and stay in soft lockoutuntil the high pressure switch closes and the delay-on-break time has expired. If the high pressure switchopens again in this same operating cycle, the unit will gointo manual lockout condition and the alarm relay circuitwill energize. Recycling the wall thermostat or mainpower resets the manual lockout.Low Pressure Switch, Bypass and Lockout SequenceIf the low pressure switch opens for more than 120seconds, the compressor contactor will de-energize andgo into a soft lockout. Regardless the state of the lowpressure switch, the contactor will re-energize afterthe delay-on-make time delay has expired. If the lowpressure switch remains open, or opens again for longerthan 120 seconds, the unit will go into manual lockoutcondition and the alarm relay circuit will energize.Recycling the wall thermostat or main power resets themanual lockout.Alarm Relay OutputAlarm terminal is the output connection forapplications where an alarm relay is employed. Thisterminal is powered whenever the compressor is lockedout due to HPC or LPC sequences as described above.Terminal Description Use Revision "2"Reference1 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 AlarmJumper 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 fromSwitch to Delay Relay Economizer Only "7"TABLE 1Sequence of Operation* Replace jumper wire with smoke alarm connections to interrupt 24VAC unit power if smoke alarm is used in shelter. Jumper can alsobe removed to break 24VAC power to unit.