Carrier 50VZ Installation, Operation And Maintenance Instructions

Also see for 38PZ: Installation manual Installation manual

Carrier 50VZ Installation, Operation And Maintenance Instructions Manual pdf 33 page image

33InstallationThe standard installation of the water heating coil is made bypositioning the connection manifolds on the same side as themotor of the evaporator unit. If necessary, it can be connectedto the opposite side. In this case the coil must be turned by 180°.The installation sequence is as follows:a. Disconnect the power supply to the unit.b. Remove the side access panels.c. Loosely screw in the 4 screws provided to attach theheating coil to the headers of the evaporator coil (leavinga free space of 3-4 mm untightened).d. Install the heating coil, inserting the semi-attached screwsin the grooves of the headers.e. Fix the 4 screws provided to attach the heating coil.f. Install the perforated plate in the upper part of the coil,covering the space that remains between the coil and theunit top panel.g. Connect heating coil sensor BT4 to terminals 39 and 40 ofthe indoor unit terminal box, and from here to terminals39 and 40 of the outdoor unit.h. Change the position of dipswitch 3 on the main board AOto position “ON”.i. For water heating coils with a proportional valve anextension board A2 must be installed and connected inaccordance with the wiring diagram for this option. In allcases, both for the all-or-nothing control valve and forthe proportional valve the elctrical conections must bemade in accordance with the wiring diagram.j. Install the blanking plate, supplied with the coil, on the cor-responding side, after punching out the prepunched holes forthe entering and leaving water connections of the manifolds.Table 11Model Unit 015 025 030 031 040 045 055 065 0756 kW Cooling only xHeat pump x12 kW Cooling only x x xHeat pump x x x x x15 kW Cooling only x xHeat pump x x x x18 kW Cooling onlyHeat pump x x x x18 (9+9) kW* Cooling only x xHeat pump24 (12+12) kW* Cooling only x x x xHeat pump* 2-stage heatingFig. 26Electric resistance heatersThis option/accessory consists of a frame with shielded electricheaters and a control box, incorporated in the same frame, withall electrical and protection components required to guaranteetotal safety. For the available capacities see Table 11.Fig. 27InstallationThe standard installation of the electric heating coil is made bypositioning the control box on the same side as the motor ofthe evaporator unit.If necessary, it can be positioned on the opposite side. In thiscase the coil must be turned by 180°.VERY IMPORTANT: If the coil is installed on the opposite side,it is NECESSARY to change the position of the two thermalprotectors to the opposite longitudinal beam, i.e. the thermalprotectors must always be positioned in the upper part of thecoil.The installation sequence is as follows:a. Disconnect the power supply to the unit.b. Remove the side access panels.c. Loosely screw in the 4 screws provided to attach theelectric heater to the headers of the evaporator coil(leaving a free space of 3-4 mm untightened).d. Install the electric heater, inserting the semi-attachedscrews in the grooves of the headers.e. Fix the 4 screws provided to attach the electric heater.f. Make all electrical connections in accordance with thewiring diagram supplied with this option.g. Install the blanking plates in their correct positions.

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