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1,2 INSTALLATION............................2-16 Step 1 — Install Motor ......................2 Step 2 — Install Motormaster III Controller ................................3 Step 3 — Install Sensor .....................3 Step 4 — Make Electrical Connections .......6 Step 5 — Install Field-Fabricated Wind Baffles and Brackets.................6 Step 6 — Restore Power to Unit.............6 TROUBLESHOOTING ....... .............. 17 SAFETY CONSIDERATIONS Installation, start-up, and servicing of this equipment can be hazardous due to system pressures, electrical components, and equipment location (roofs, elevated structures, etc.). Only trained, qualified installers and service technicians should install, start up, and service this equipment. When working on this equipment, observe precautions in the literature and on tags, stickers, and labels attached to the equipment and any other safety precautions that may apply. A WARNING Open all remote disconnects before servicing this equipment. Electrical shock could result in personal injury. GENERAL This book contains instructions for the installation, start-up, and service of the Motormaster III control on 38AKS008-012, 38AQS008, 38AK008-012, 48/50TJ008- 014, 48/50HJ008-014, and 50LJQ008,012 units. The Motormaster III control is not used on 50-Hz versions of the 50HJ008-014 and 50LJQ008,012 units. NOTE: The Motormaster III control is not used on 48/50HJ and 48/50TJ units with 2 condenser fans. The control is used on single condensing fan units only. The Motormaster III accessory is UL (Underwriters’ Laboratories) and CSA (Canadian Standards Association) approved on all split system and small rooftop electric cooling and gas heating/electric cooling units. The Motormaster III device is a motor speed control device which adjusts condenser fan motor speed in response to declining liquid temperatures. A properly applied Motormaster III control extends the operating range of air conditioning systems and permits operation at lower outdoor ambient temperatures. Table 1 shows the ambient temperature in cooling at which each unit will operate without modification. Table 1 — Unit Ambient Temperature Operation UNIT COMPRESSOR CAPACITY CONDENSER TEMP F (C) MINIMUM OUTDOOR TEMP F(C) Small Rooftop Units All 100% 90 (32) 25 (-4) Split System Units 38AQS008 (60 Hz) 100% 90 (32) 55 (13) 38AK/AKS008 (50/60 Hz) 100% 90 (32) 60 (15) 38AKS009 (60 Hz) 100% 90 (32) 53 (12) 38AKS009 (50 Hz) 100% 90 (32) 57 (14) 38AKS012* 100% 90 (32) 48 (9) (50/60 Hz) 67% 80 (27) 52 (11) 38AK012 (50/60 Hz) 100% 90 (32) 52 (11) * Unit has one step of unloading. To operate the units below the ambient temperatures in Table 1, wind baffles and the Motormaster III control package must be added. The Motormaster III control permits operation of the unit to an ambient temperature of -20 F (-29 C) for small rooftop units, and 0 F (-18 C) for split system units. The Motormaster III regulates the speed of 3-phase fan motors which are compatible with the control. These motors are included in the package. See Tables 2 and 3 for the contents of the Motormaster III accessory packages. The CAMOTOR3001A00 package contains a motor for 208/230 volt, 60 Hz and 220 volt, 50 Hz applications. The CAMOTOR3002A00 package contains a motor for 460 and 575 volt, 60 Hz and 400 volt, 50 Hz applications. See Fig. 1. Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book|1 |1 |1 |1 |4 |4 |4 |4 PC 111 Catalog No 533-803 Printed in U S A. Form 38/48/50-4SI Pg 1 1-95 Replaces: New Table 2 - Motormaster® III Control Package CAMOTOR3001A00, 208/230 v, 60 Hz and 220 v, 50 Hz Applications INSTALLATION Step 1 — Install Motor QUANTITY ITEM PART NO. 1 Motormaster III Control HR46GN001 1 Sensor 30GT412176 1 Motor HD52GK208 8 Screw (5/16-in.) AL81AS216 1 Relay HN61KZ024 2 Screw (no. 6 — 20 x 3/4-in ) AL56AU128 1 Bracket 50DK507132 1 Socket HY07RB030 Table 3 — Motormaster III Control Package CAMOTOR3002A00, 460 and 575 v, 60 Hz and 400 v, 50 Hz Applications QUANTITY ITEM PART NO. 1 Motormaster III Control HR46GN001 1 Sensor 30GT412176 1 Motor HD52GK460 8 Screw (5/16-in ) AL81AS216 1 Relay HN61KZ024 2 Screw (no. 6 — 20 x 3/4-in.) AL56AU128 1 Bracket 50DK507132 1 Socket HY07RB030 Before Installing — Inspect the contents of the accessory package before installing. File a claim with the shipper if shipping damage is found. Contact the Carrier distributor if a part is missing. Fig. 1 — Motormaster III Control A WARNING To avoid the possibility of electrical shock, open all disconnects before installing or servicing this accessory. 1. Shut off unit power supply. 2. Remove unit access panel and control box cover. 3. Disconnect fan motor connection in control box and remove motor leads from control box. 4. Remove condenser fan assembly (grille, motor, motor cover, and fan) by removing...
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