ICP *9MPT050F12 Installation Instruction

Contents

35440 01 2021 01Natural Gas Input Rating CheckNOTE: The gas meter can be used to measure input to furnace.Rating is based on a natural gas BTU content of 1,000 BTUís percubic meter. Check with gas supplier for actual BTU content.1. Turn OFF gas supply to all appliances and start furnace.Use jumper wire on R to W1 and W2 for Hi fire.2. Time how many seconds it takes the smallest dial on the gasmeter to make one complete revolution. Refer to Example.3. Repeat steps 1 and 2 with jumper wire on R to W1 for lowfire.NOTE: Third (3rd) dip switch must be in ìONî position. (SeeFurnace Wiring Diagram). Return third (3rd) dip switch toprevious setting after check.ExampleNatural GasBTU ContentNo. ofSecondsPer HourTime PerCubic Foot inSecondsBTU PerHour1,000 3,600 48 75,0001,000 x 3,600 48 = 75,000 BTUHFinal CheckFIRE OR EXPLOSION HAZARDFailure to follow this warning exactly could resultin serious injury, death and/or property damage.Never test for gas leaks with an open flame. Use acommercially available soap solution made specifi-cally for the detection of leaks to check allconnections. A fire or explosion could resultcausing property damage, personal injury and/orloss of life.! WARNING1. The furnace and the equipment shut off valve must be discon-nected from the gas supply piping system during any pres-sure testing of that system at test pressures in excess of 1/ 2PSIG. Close the manual shut--off valve before testing atsuch pressures.2. The furnace must be isolated from the gas supply system byclosing the equipment shut off valve during any pressuretesting of the gas supply system at test pressure equal to orless than 1/ 2 PSI (3.5 Upa).3. When installation is complete, test all pipe connections forleaks with the gas pressure less than 1/ 2 PSIG to the gasvalve.4. Apply a commercial soap solution to all joints to test forleaks. Correct any leaks indicated by bubbles.5. Correct even the smallest leak at once.6. Check for leaks at gas valve and orifice connections to theburner manifold along with the pilot tube connections to thevalve and pilot assembly while the furnace is operating.7. Electrical WiringELECTRICAL SHOCK HAZARD.Failure to turn off power could result in death orpersonal injury.Turn OFF electrical power at fuse box or servicepanel before making any electrical connectionsand ensure a proper ground connection is madebefore connecting line voltage.! WARNINGPower Supply WiringThe furnace MUST be electrically wired and grounded in accor-dance with local codes, or in the absence of local codes with thelatest edition of The National Electric Code, ANSI NFPA 70 and/orThe Canadian Electric Code CSA C22.1.Field wiring connections must be made inside the furnace connec-tion box. A suitable strain relief should be used at the point thewires exit the furnace casing.NOTE: Furnace will not have normal operation is line polarity is re-versed. Check ALL field and control connections prior to opera-tion.Copper conductors shall be used. Line voltage wires shouldconform to temperature limitation of 63 F (35 C) rise and be sizedfor the unit maximum amps stated on the rating plate. Add the fullload amps for potential field--installed accessories such as elec-tronic air cleaners and humidifiers that would receive power fromthe furnace control. The furnace control is rated for a maximum of1.0 amps combined for EAC and HUM. Consult NEC or localcodes for proper wire and circuit sizing.J- Box RelocationThe j--box is installed on left side of casing. An alternate j--boxlocation on right side can be used.1. Remove bag containing two hole plugs and two self tappingscrews from loose parts bag in blower compartment.2. Remove two screws holding j--box to casing.3. Move large hole plug from right to left j--box location.4. Clip wire tie holding j--box wires.5. Move j--box to alternate location and attach using two selftapping screws from bag.6. Apply two hole plugs from bag at left j--box location.ThermostatThe 2--stage furnace control will operate with either a single stageor a two stage heating thermostat and will provide 2--stage heatingoperation.For single--stage thermostat installations, the R and W wires fromthe thermostat connect to the R and W1 connections on the fur-nace control.Note: The TT (Thermostat Type) DIP switch (SW1--3) should be inthe off position for the furnace to operate properly with a single--stage thermostat. Failure to change DIP switch with single stagethermostat will result in Low Heat operation ONLY. (See Figure 38and wiring diagram)During operation, the furnace will operate on low Heat for up to12minutes. If the heat request exists for more than 12 minutes, the