TASKMASTER 5100 SERIES INSTALLATION INSTRUCTIONS & PARTS LIST Horizontal or Vertical Mounting Industrial / Commercial Unit Heater ATTENTION: Read carefully before attempting to install, operate or service the TaskMaster Unit Heater. Retain these installation instructions for future use. PRODUCT FEATURES Forced air electric unit heater available in 208, 240/208, 227, 480, 550 or 600 volt as standard. Ten standard heating capacities of 3.3 KW/11,260 BTUH thru 50.0 KW/170, 600 BTUH.
PROPER LOCATION INSTRUCTIONS GENERAL SAFETY INFORMATION / CAUTION: Once the total heating load is calculated, the quantity and capacity of the unit heaters must be determined. because a large number of low-capacity heaters provides more uniform heat distribution. This approach is recommended when the area will be occupied by a relatively large number of sedentary personnel, (i.e. working on production lines and at benches.
PRINCIPLES OF OPERATION Upon a call for heat from the floor level or unit mounted optional accessory thermostat, the unit fan motor and heating elements shall be energized and remain ON until temperature reaches setting of thermostat; at which time the heating elements shall be deenergized.
INSTALLATION INSTRUCTIONS TASKMASTER -- 5100 SERIES UNIT HEATER ATTENTION: READ INSTRUCTION CAREFULLY All electric unit heaters are shipped fully assembled. Installation includes hanging the unit, mounting the built-in and remote accessories, wiring of optional control devices, and electrical wiring to the unit.
INSTALLATION INSTRUCTIONS TASKMASTER -- 5100 SERIES UNIT HEATER (part 2) HORIZONTAL -- AIR DISCHARGE MOUNTING SHOWN IN: FIGURE 5 & 6 VERTICAL -- AIR DISCHARGE MOUNTING SHOWN IN: FIGURE 7 Swivel hanger brackets may be used to suspend unit heaters from either the wall (figure 5) or the ceiling (figure 6). Attach hanger base “A” to top of heater with the four 5/16 X 18 caps screws and lockwashers (provided in envelope).
5100 SERIES UNIT HEATER ELECTRICAL DATA (Table 2) CATALOG NUMBER KW RATING BTU/HR (000) HEATER / MOTOR VOLTAGE HEATER PHASE CONTROL VOLTAGE AMPS PER PHASE BRANCH CIRCUIT PROTECTION SIZE(A) SUPPLY WIRE SIZE 60o C AWG ** 3.3 3.3 11.2 11.2 3.3/2.5 3.3/2.5 11.2/8.5 11.2/8.5 3.3 3.3 5.0 5.0 5.0 11.2 11.2 17.1 17.1 17.1 5.0/3.7 5.0/3.7 17.1/12.8 17.1/12.8 5.0 5.0 7.5 17.1 17.1 25.6 HF2B5107CA1 7.5/5.6 25.6/19.2 G1G5107CA1 P3P5107CA1 7.5 7.5 25.6 25.6 HF2B5110CA1 10.0/7.5 34.1/25.
5100 SERIES UNIT HEATER AIR DELIVERY DATA CFM at OUTLET 400 400 400 400 400 400 400 400 400 400 400 400 700 700 700 700 700 700 700 700 700 1100 1100 1100 1100 1100 2000/1800 2000/1800 2000/1800 2000/1800 2000/1800 2000/1800 3100/2800 3100/2800 3100/2800 3100/2800 3100/2800 3100/2800 558 700 700 1100 1100 2000/1800 2000/1800 3100/2800 3100/2800 680 680 680 1080 1080 1980/1780 1980/1780 2900/2650 2900/2650 FPM at OUTLET 1030 1030 1030 1030 1030 1030 1030 1030 1030 1030 1030 1030 1000 1000 1000 1000 1000 1
5100 SERIES UNIT HEATER TROUBLE SHOOTING GUIDE SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION Thermostat calls for heat, but heater does not function. 1. Open (blown) fuse 1. Replace fuses, check for cause. (see Replacement Parts List for fuse size) 2. INCORRECT WIRING 2. CHECK WIRING CONNECTIONS 3. Thermal cut-out open, deenergizing heater element and control circuit. Fan motor runs “HOT” Fan motor runs, but no heat. 3.
5100 SERIES UNIT HEATER WIRING DIAGRAM SCHEDULE DIAGRAM NO.
5100 SERIES UNIT HEATER PARTS LIST - CATALOG NUMBERS HEATER MODEL F1F5103N F25103N HF1B5103N HF2B5103N G1G5103N P3P5103CA1N F1F5105N F2F5105N HF1B5105N HF2B5105N G1G5105N P3P5105CA1N F2F5107CA1L HF2B5107CA1L G1G5107CA1L P3P5107CA1N F2F5110CA1L HF2B5110CA1L G1G5110CA1L P3P5110CA1N F3F5115CA1L HF3B5115CA1L P3P5115CA1N HF3B5120CA1L P3P5120CA1N HEATER MODEL MOTOR ELEMENT ASSEMBLY AUTOMATIC RESET FAN OVERRIDE 56562-012 56562-012 56562-017 56562-017 56562-016 56562-018 56562-012 56562-012 56562-017 56562-0
5100 SERIES UNIT HEATER PARTS LIST - CATALOG NUMBERS - 600 VOLT MODELS MOTOR ELEMENT ASSY. AUTO RESET LIMIT FAN OVERRIDE XFMR CONTACTOR POWER TRML. BLOCK FAN BLADE TERMINAL BLOCK GROUND CONN.
LIMITED WARRANTY Products manufactured by TPI Corporation are warranted to the original consumer to be free from defects in material and workmanship for twelve (12) months from the original purchase date.
TASKMASTER 5100 SERIES INSTALLATION INSTALLATION INSTRUCTIONS INSTRUCTIONS &&PARTS PARTS LIST LIST Montage horizontal ou vertical radiateur industriel et commercial ATTENTION: Lisez les instructions soigneusement avant de commencer l’installation, la mise en marche ou l’entretien du radiateur taskmaster. Gardez ces instructions pour utilisation ulterieure. CARACTERISTIQUES Radiateur electrique ventilateur, disponible suivant les tensions standards de 208, 240/208, 277, 480 ou de 600 volts.
INSTRUCTIONS D'ENDROIT NÉCESSAIRES Général SAFETY INFORMATION / PRUDENCE : Dès que la charge totale de chauffage est calculée, la quantité et la capacité des chauffages d'unité doivent être déterminés. parce qu'un grand nombre de chauffages de capacité basse fournit la distribution de chaleur plus uniforme. Cette approche est recommandée quand la région sera occupée par un relativement grand nombre de personnel sédentaire, (c'est-à-dire travaillant des chaînes de fabrication et aux bancs.
TASKMASTER 5100 SERIES 55 THRU 100 kW MODELS INSTALLATION INSTRUCTIONS & PARTS LIST Horizontal or Vertical Mounting Industrial / Commercial Unit Heater ATTENTION: Read carefully before attempting to install, operate or service the TaskMaster Unit Heater. Retain these installation instructions for future use. PRODUCT FEATURES Forced air electric unit heater available in 208, 240/208, and 480 volt, 3 phase as standard. Ten standard heating capacities of 55.0 KW/187,715 BTUH thru 100.0 KW/341,300 BTUH.
PROPER LOCATION INSTRUCTIONS GENERAL SAFETY INFORMATION / CAUTION: Once the total heating load is calculated, the quantity and capacity of the unit heaters must be determined. because a large number of low-capacity heaters provides more uniform heat distribution. This approach is recommended when the area will be occupied by a relatively large number of sedentary personnel, (i.e. working on production lines and at benches.
PRINCIPLES OF OPERATION Upon a call for heat from the floor level or unit mounted optional accessory thermostat, the unit fan motor and heating elements shall be energized and remain ON until temperature reaches setting of thermostat; at which time the heating elements shall be deenergized. The fan motor shall continue to run and purge heater casing of residual heat until setting of fan override is reached, then the fan motor shall be deenergized. All units are supplied with a single speed motor .
INSTALLATION INSTRUCTIONS TASKMASTER -- 5100 SERIES UNIT HEATER ATTENTION: READ INSTRUCTION CAREFULLY All electric unit heaters are shipped fully assembled. Installation includes hanging the unit, mounting the built-in and remote accessories, wiring of optional control devices, and electrical wiring to the unit. To insure proper delivery of the heated air to desired areas, follow the mounting height and air projection tables include in these instructions. Follow Fig.
INSTALLATION INSTRUCTIONS TASKMASTER -- 5100 SERIES UNIT HEATER (part 2) HORIZONTAL -- AIR DISCHARGE MOUNTING SHOWN IN: FIGURE 5 & 6 Swivel hanger brackets may be used to suspend unit heaters from either the wall (figure 5) or the ceiling (figure 6). Attach hanger base “A” to top of heater with the four 5/16 X 18 caps screws and lockwashers (provided in envelope). Attach main hanger frame “B” to wall or ceiling in desired location using appropriate hardware or welding.
5100 SERIES UNIT HEATER ELECTRICAL DATA (Table 2) CATALOG NUMBER F3F5155CA1 HF3B5155CA1 P3P5155CA1 F3F5160CAI HF3B5160CAI P3P5160CA1 F3F5165CAI HF3B5165CA1 P3P5165CA1 F3F5170CA1 HF3B5170CA1 P3P5170CA1 F3F5175CA1 HF3B5175CA1 P3P5175CA1 HF3B5180CA1 P3P5180CA1 HF3B5185CA1 P3P5185CA1 HF3B5190CA1 P3P5190CA1 HF3B5195CA1 P3P5195CA1 HF3B51100CA1 P3P51100CA1 KW RATING BTU/HR (000) HEATER / MOTOR VOLTAGE HEATER PHASE CONTROL VOLTAGE AMPS PER PHASE BRANCH CIRCUIT PROTECTION SIZE-(A) 55.0 55.0/41.25 55.0 60.
5100 SERIES UNIT HEATER AIR DELIVERY DATA CFM at OUTLET 3400 3400 3400 3400 3400 3400 3400 3400 3400 3400 3400 3400 3400 3400 3400 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 FPM at OUTLET 1485 1485 1485 1485 1485 1485 1485 1485 1485 1485 1485 1485 1485 1485 1485 1529 1529 1529 1529 1529 1529 1529 1529 1529 1529 FAN MOTOR DATA TEMPETURE RISE o F HP 55 55/41 55 60 60/45 60 65 65/49 65 70 70/53 70 75 75/56 75 55/41 55 58/44 58 61/46 61 65/48 65 68/51 68 1/3 1/3 1/3 1/3 1/3 1/3 1/3 1/3 1/3 1/3 1/3
5100 SERIES UNIT HEATER TROUBLE SHOOTING GUIDE SYMPTOM POSSIBLE CAUSE(S) CORRECTIVE ACTION Thermostat calls for heat, but heater does not function. 1. Open (blown) fuse 1. Replace fuses, check for cause. (see Replacement Parts List for fuse size) 2. INCORRECT WIRING 2. CHECK WIRING CONNECTIONS 3. Thermal cut-out open, deenergizing heater element and control circuit. Push reset button. Fan motor runs “HOT” Fan motor runs, but no heat. 3.
5100 SERIES UNIT HEATER WIRING DIAGRAM SCHEDULE DIAGRAM NO.
SERIES 5100 TASKMASTER SC5100 Installation Instructions FOR MODELS 5155 THRU 51100 READ THESE INSTRUCTIONS CAREFULLY BEFORE INSTALLING CONTROL. BE SURE TO DE-ENERGIZE POWER SOURCE TO UNIT BEFORE INSTALLING CONTROL. 1.) Disconnect heater from power supply. 2.) Mount the controller in the control compartment as shown. 3.) Refer to page 2 for wiring.
1) AFTER MOUNTING BOARD IN HEATER, PROCEED WITH WIRING AS SHOWN. 2) TERMINAL ARE IN REFERENCE TO THE TERMINAL BOARD LOCATED IN THE CONTROL COMPARTMENT. 3) REFER TO MANUFACTURERS MANUAL FOR THERMOSTAT, 0-10VDC OR 4-20mA SIGNAL CONNECTIONS AND SETTINGS. “DIP” SWITCHES MUST BE SET FOR INPUT AND STAGING. SEQUENCING OPERATION MUST ALWAYS BE LAST IN FIRST OUT(LIFO) WHICH IS THE FACTORY DEFAULT SETTING. 4) THE 5100 SERIES 55-75kW UNITS ARE CAPABLE OF 3 STAGES, THE 80-100kW ARE CAPABLE OF 4 STAGES.
SERIES 5100 TASKMASTER INSTALLATION INSTRUCTIONS DCS202 POWER DISCONNECT SWITCH TASKMASTER SERIES RATING - 2 POLE 20 AMP 277 VAC RESISTIVE READ THESE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING SWITCH. BE SURE TO DE-ENERGIZE POWER SOURCE TO UNIT BEFORE INSTALLING SWITCH. CHECK HEATER DATA LABEL TO INSURE THAT HEATER ELECTRICAL RATING DOES NOT EXCEED THE POWER DISCONNECT ELECTRICAL RATING. SUPPLY WIRES MUST BE COPPER CONDUCTORS ONLY. ALL WIRING TO BE IN ACCORDANCE WITH CSA, NEC AND LOCAL CODES.
SERIES 5100 TASKMASTER INSTALLATION INSTRUCTIONS DCS403, DCS603, DCS1003 POWER DISCONNECT SWITCH TASK MASTER SERIES RATING DCS403 DCS603 DCS1003 3 POLE 3 POLE 3 POLE 40 AMPS 60 AMPS 100 AMPS 600 VAC RESISTIVE 600 VAC RESISTIVE 600 VAC RESISTIVE January 1990 WARNING: Open supply circuit disconnect switch before servicing unit. Failure to do so may result in personal injury or death from electrical shock.
SERIES 5100 TASKMASTER Installation Instructions FS5101 TASKMASTER SERIES UNIT MOUNTED LINE VOLTAGE SUMMER FAN SWITCH FOR USE ON UNITS WITH 208, 240, 277 VOLT SUPPLY ONLY READ THESE INSTRUCTIONS CAREFULLY BEFORE INSTALLING SWITCH. BE SURE TO DEENERGIZE POWER SOURCE TO UNIT BEFORE INSTALLING SWITCH. BE SURE TO INSTALL THE APPROPRIATE MODEL SWITCH ON THE CORRECT UNIT. 1.) Disconnect heater from power supply. 2.) Remove appropriate knockout for switch being used. Refer to Fig. 1. Fig. 1 Fig. 1 Fig.
Fig. 4 3.) Remove knurled nut and “On-Off” indicator ring from switch assembly. 4.) Align flats on switch with flats in knockout (Note position switch so data label will be visible from open end of control compartment. 5.) Install “On-Off” indicator ring and secure switch assembly to heater with knurled nut. 6.) Wire switch according to wiring diagram located on inside of heater bottom panel. Attach switch leads 7 & 9 to terminals 7 & 9 on terminal board. 7.
SERIES 5100 TASKMASTER FSW5111 TASKMASTER SERIES REMOTE (WALL MOUNT) SUMMER FAN SWITCH LINE VOLTAGE SWITCH FOR USE ONLY ON TASKMASTER HEATERS WITH A POWER SUPPLY OF 208, 240 OR 277 VOLT SERVICE. READ THESE INSTRUCTIONS CAREFULLY BEFORE INSTALLING SWITCH. DO NOT USE THIS SWITCH ON UNITS WITH 480 OR 600 VOLT MOTOR CIRCUIT. BE SURE TO DE-ENERGIZE POWER SOURCE TO UNIT BEFORE INSTALLING SWITCH. ALL CONDUCTORS FROM SWITCH TO UNIT MUST BE COPPER (NEC) AND EXISTING LOCAL CODE REQUIREMENTS. 1.
SERIES 5100 TASKMASTER INSTALLATION INSTRUCTIONS FSW5112 TASKMASTER SERIES REMOTE (WALL MOUNT) LOW VOLTAGE SUMMER FAN SWITCH LOW VOLTAGE SWITCH FOR USE ON TASKMASTER HEATERS WITH SUFFIX CODE “CA1” ONLY. THIS ACCESSORY PACKAGE CONTAINS A REMOTE FAN SWITCH AND A LOW VOLTAGE RELAY FOR UNIT MOUNTING. READ THESE INSTRUCTIONS CAREFULLY BEFORE INSTALLING SWITCH. USE THIS SWITCH ONLY ON UNITS WITH 24 VOLT CONTROL CIRCUITS. BE SURE TO DE-ENERGIZE POWER SOURCE TO UNIT BEFORE INSTALLING SWITCH.
SERIES 5100 TASKMASTER INSTALLATION INSTRUCTIONS TW1510, TW1512 REMOTE MOUNTING LINE VOLTAGE THERMOSTAT SINGLE STAGE TW1510 (SPST) TW1512 (DPST) 1) Disconnect heater from power supply. 2) Mount wall thermostat in desired location. 3) Wire the thermostat to the heater following the wiring diagram located on the heater. All wiring to be in accordance with local and/or national codes. 4) Restore power to the heater.
SERIES 5100 TASKMASTER INSTALLATION INSTRUCTIONS CEILING HANGER BRACKET TASKMASTER SERIES VERTICAL DISCHARGE AIR DELIVERY J K MODEL V5105 USE WITH 5102-5105 UNITS MODEL V5120 USE WITH 5107-5120 UNITS MODEL V5150USE WITH 5125-5175 UNITS L M N D F E B F A G H MODEL V5105 IS FOR USE WITH 5102 THRU 5105 HEATERS.
SERIES 5100 TASKMASTER INSTALLATION INSTRUCTIONS TW1510, TW1512 REMOTE MOUNTING LINE VOLTAGE THERMOSTAT SINGLE STAGE TW1510 (SPST) TW1512 (DPST) 1) Disconnect heater from power supply. 2) Mount wall thermostat in desired location. 3) Wire the thermostat to the heater following the wiring diagram located on the heater. All wiring to be in accordance with local and/or national codes. 4) Restore power to the heater.
SERIES 5100 TASKMASTER Installation Instructions TFS5102 TASKMASTER SERIES REMOTE MOUNTING 24 VOLT OPERATION TWO STAGE CONTROL & INTEGRAL FAN SWITCH 1.) Disconnect heater from power supply. 2.) At the desired location, run the thermostat cable through the hole in the center of the thermostat mounting sub-base. Leave about three inches of wire for connections. For the correct number of wires, see appropriate heater or control package wiring diagram and instructions. 3.
FIG. 2 2 - 5KW FIG. 2 7 - 20KW FIG. 2 25 - 50KW 8.) Fig. 2 Mount low volt relay in wiring compartment. Slip long leg of relay base under raised section of control mounting plate and attach diagonally opposite corner of relay base to control mounting plate with the No. 8 sheet metal screw supplied. NOTE: Models 5102 thru 5105 Relay is mounted next to heater terminal block Models 5107 thru 5150 Relay is mounted next to heater terminal board 9.
SERIES 5100 TASKMASTER INSTALLATION INSTRUCTIONS Dust Shield - Taskmaster Series For Horizontal Air Delivery Units Model DS5105 Model DS5120 Model DS5150 Use with 5102-5105 Units Use with 5107-5120 Units Use with 5125-5150 Units 1) Install the hanger base “A” on the heater following the instruction sheet packed with the combination wall/ceiling bracket or the hanger base. 2) Attach the hanger bracket to the wall or ceiling as desired following instructions packed with the bracket.
SERIES 5100 TASKMASTER INSTALLATION INSTRUCTIONS CAUTION: Models 5155 thru 5175 require that two circuits be wired to stage one and one circuit be wired to stage two. TW123 - TASKMASTER SERIES REMOTE MOUNTING 24 VOLT OPERATION TWO STAGE CONTROL 1. Disconnect heater from power supply. 2. At the desired location, run the thermostat cable through the hole in the center of the thermostat mounting sub-base. Leave about three inches of wire for connections.
SERIES 5100 TASKMASTER INSTALLATION INSTRUCTIONS TASKMASTER SERIES T5100, T5102, T5122, TC5102 AND TC5103 Built-in Thermostat Kits for Field installation in the 5100 Series Unit Heaters. T5100 provides SPST line voltage control for single phase heaters up to 277V, 25a. or Pilot duty control (24-277 volt) for contactor equipped heaters. T5102 provides double pole line voltage control breaking all ungrounded conductors for single phase heaters up to 277V, 25 amperes.
CLIPS BULB MOUNTING SCREW SWITCH RELAY FIG. 1 3.3 - 5KW FIG. 2 3.3 - 5KW CLIPS BULB BULB FIG. 1 7 - 20KW FIG. 1 25 - 50KW MOUNTING SCREW SWITCH RELAY MOUNTING SCREW SWITCH RELAY FIG. 2 7 - 20KW FIG. 2 25 - 50KW 7.) Install knob by pushing onto thermostat shaft. 8.) Connect lead wires from the thermostat to the control terminal board as shown in the wiring diagrams located on the inside of the control panel door. 9.) Set thermostat for desired turn on temperature.
Instructions d'Installation SERIES TASKMASTER Necessaires de thermostat incorpores T5100, T5102, T5122, TC5102 et TC5103 (pour etre installes sur place les radiateurs de series 5100) Le T5100, Unipolaire a` une direction (SPST), controle la tension de ligne pour les radiateurs monophases jusqu' a` 277V, 25A. ou veilleuse (24-277 volts) pour les radiateurs munis de contacteurs.
ATTACHES AMPOULE FIG. 1 3.3 - 5KW FIG. 2 3.3 - 5KW ATTACHES AMPOULE FIG. 1 7 - 20KW FIG. 1 25 - 50KW MOUNTING SCREW SWITCH RELAY FIG. 2 7 - 20KW FIG. 2 25 - 50KW 7.) Installez le bouton en le poussant sur l'arbre du themostat. 8.) Connectez les fils conducteurs du thermostat aux bornes de controle comme montre sur les shemas de filerie situes a l'interieur de la porte du panneau de controle. 9.) Reglez le thermostat a` la temperature desiree.
SERIES 5100 TASKMASTER Installation Instructions FS5102TASKMASTER SERIES UNIT MOUNTED LINE VOLTAGE SUMMER FAN SWITCH FOR USE ON EITHER 480 OR 600 VOLT SUPPLY READ THESE INSTRUCTIONS CAREFULLY BEFORE INSTALLING SWITCH. BE SURE TO DE-ENERGIZE POWER SOURCE TO UNIT BEFORE INSTALLING SWITCH. BE SURE TO INSTALL THE APPROPRIATE MODEL SWITCH ON THE CORRECT UNIT. REMOVE FOR FS5102 1.) Disconnect heater from supply. 2.) Remove appropriate knockouts for switch being used. Refer to Fig. 1. 0.875 Ø0.
SERIES 5100 TASKMASTER Installation Instructions FS5102TASKMASTER SERIES UNIT MOUNTED LINE VOLTAGE SUMMER FAN SWITCH FOR USE ON EITHER 480 OR 600 VOLT SUPPLY READ THESE INSTRUCTIONS CAREFULLY BEFORE INSTALLING SWITCH. BE SURE TO DE-ENERGIZE POWER SOURCE TO UNIT BEFORE INSTALLING SWITCH. BE SURE TO INSTALL THE APPROPRIATE MODEL SWITCH ON THE CORRECT UNIT. REMOVE FOR FS5102 1.) Disconnect heater from supply. 2.) Remove appropriate knockouts for switch being used. Refer to Fig. 1. 0.875 Ø0.
SERIES 5100 TASKMASTER Installation Instructions FOR RADIAL DIFFUSER MODEL RD5120 MODEL RD5150 MODEL RD5175 USE WITH 5107-5120 UNITS USE WITH 5125-5150 UNITS USE WITH 5155-5175 UNITS READ THESE INSTRUCTIONS CAREFULLY BEFORE INSTALLATION. BE SURE TO DE-ENERGIZE POWER SOURCE TO UNIT BEFORE INSTALLING DIFFUSER. CHECK MODEL NUMBER TO INSURE INSTALLATION ON PROPER SIZE UNIT. MOUNTING BOLT DETAIL FRONT PANEL OF UNIT NYLON PUSH NUT STARWASHER FLAT WASHER MOUNTING SCREW 1.) Disconnect heater from supply. 2.
SERIES 5100 TASKMASTER INSTALLATION INSTRUCTIONS ANEMOSTAT DIFFUSER TASKMASTER SERIES MODEL AD5120 USE WITH 5107-5120 UNITS MODEL AD5150 USE WITH 5125-5150 UNITS MODEL AD5175 USE WITH 5155-5175 UNITS READ THESE INSTRUCTIONS THOROUGHLY BEFORE INSTALLING DIFFUSER. BE SURE TO DE-ENERGIZE POWER SOURCE TO UNIT BEFORE INSTALLING DIFFUSER. CHECK MODEL NUMBER OF DIFFUSER TO INSURE INSTALLATION ON PROPER SIZE UNIT.