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National Comfort Product CPG41238-U Series Installation Manual
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Contents
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Installation Guide for Comfort Pack (CPG) Units14Gas Furnace SpecificationsGas Heat – The cabinet includes a gas furnace with integralflue duct, direct spark ignition, safety controls, and operatingcontrols. The installation of the unit and gas piping must be inaccordance with local codes.Gas Valve Setting 3.5” w.c.HEAT MODULE 14208309 14208308 14208303INPUT BTUH 38,000 51,000 64,000OUTPUT BTUH 30,400 40,800 51,200MAXIMUM EXTERNALSTATIC PRESSURE .5" W.C. .5" W.C .5" W.CDISCHARGETEMPERATURE RISERANGE45°F to 60°F 45°F to 65°F 60°F to 80°FBLOWER SPEEDSETTINGMed. Low*(4-Black)Med. High*(2-Yellow)High*(1-Red)*See Wiring Diagram on Page 33.To ensure safe operation and long life of the heat exchanger, themaximum static pressure and/or maximum temperature rise must notbe exceeded. Operation of the heater at conditions that exceed theheater’s specifications will void the heat exchanger warrantyMODEL SIZE 38 51 64ORIFICE SIZE N.G. 31 28 22ORIFICE SIZE L.P. 49 2.1 mm 41NOMINALTEMPERATURE RISE 52.5°F 55°F 67°FALLOWABLE AIRTEMPERATURE RANGE 140-160 140-160 135-160CO 2 %- ACCEPTABLERANGE 4.5 to 5.2 4.8 to 5.8 4.5 to 5.5CO AIR FREE - PPM 0 - 200 0 - 200 0 - 200SENSING COLD 1.05 +/- .1 1.05 +/- .1 1.05 +/- .1PRESSURE HOT .8+/- .05 .8+/- .05 .8+/- .05EFFICIENCY RANGE 81.5% - 82.5% 81.5% - 82.5% 80.1% - 81.1%STACK TEMPERATURE 245°F- 300°F 245°F- 300°F 270°F- 330°FTemperature Rise Range Based On Return Air TemperatureSequence of Operations (Gas Heat)1. Call for Heat – The thermostat sends a call for heat thereforeenergizing the “white” wire to the control board. The controlchecks to see that the limit switch is closed and the pressureswitch is open. If the limit switch is open, the control responds asdefined in the “Limit Switch Operation - page 9”. If the pressureswitch is closed, the control will do four flashes on the greenLED and wait indefinitely for the pressure switch to open. If thepressure switch is open, the control proceeds to (2.) Pre-purge.2. Pre-purge – The control energizes the venter motor and waitsfor the pressure switch to close. If the pressure switch does notclose within 240 seconds of the venter motor energizing, on 3attempts ,the control green LED will flash two times and willenter a soft lock out. When the pressure switch is proven closed,the control begins the pre-purge time. If flame is present anytime while in pre-purge, the pre-purge time is restarted. If flameis present long enough to cause lockout, the control respondsas defined in “Undesired Flame - page 18”. The control runs theventer motor for a 20 second pre-purge time, then proceeds tothe (3.) Ignition Trial Period.3. Ignition Trial Period – The control energizes the sparkand main gas valve. The venter remains energized. If flame issensed during the first 16 seconds, the spark is de-energizedand the control proceeds to (4.) Heat Blower On Delay. If flamehas not been sensed during the first 16 seconds, the controlde-energizes the spark output and keeps the gas valve energizedfor an additional one second flame proving period. If flame is notpresent after the flame proving period, the control de-energizesthe gas valve and proceeds with ignition re-tries as specified in“Ignition Retry - page 9”. If flame is present, the control proceedsto the (4.) Heat Blower On Delay4. Heat Blower On Delay – The control waits for 30 secondsfrom the time the gas valve opened and then energizes theblower motor. The gas valve and venter motor remain energized.The control proceeds to (5.) Steady Heat.5. Steady Heat – The control continuously monitors to thesafeties (high limit, roll-out, and pressure) for open switches,flame sensor for proving, and the thermostat for a call forheat. When the thermostat call for heat is removed, the controlde-energizes the gas valve and begins (6.) Post-purge and(7.) Blower Off Delay.6. Post-purge – The venter motor output remains on for a45-second post-purge period after the thermostat is satisfied.7. Blower Off Delay – The blower motor is de-energized after ablower off delay 90 seconds factory setting (field adjustable, seepage 17 or 50). Timing begins when the thermostat is satisfied. |
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