Carrier 48MA/50ME016-040 Installation, Start-up And Service Instructions Manual

Contents

Carrier 48MA/50ME016-040 Installation, Start-up And Service Instructions Manual Manual pdf 14 page image

Field Control WiringZONE THERMOSTATS — Install a Carrier approved ac-cessory zone thermostat assembly in each zone according toinstallation instructions included in the accessory. Locate eachthermostat assembly in the space where it will sense averagezone temperature.Route thermostat cable or equivalent single leads of no.18 AWG (American Wire Gage) colored wire from thermo-stat subbase terminals through opening on base unit(Fig. 1, 2, 4, and 5) to low-voltage thermostat connectionson zone control board (Fig. 10). Use no. 16 AWG wire forlengths exceeding 50 ft.ZONE MODULE CONNECTIONS — Any module may becontrolled independently or jointly with another module ormodules. Modules are combined into nests that form indi-vidual Class II circuits (40 va) as follows:Modules no. 1 and 2, 3 and 4, 5 and 6, 7 and 8, 9 and 10(028-040 units), 11 and 12 (034,040 units).The control signal can be transferred from one nestto another nest by using factory-supplied jumpers onquick-connect type multiplexing terminals. This prevents over-loading the nest control transformers. Factory-supplied jump-ers with quick-connect terminals are shipped in the zone con-trol and thermostat panel compartment.Under no circumstances shall the transformer power fromone Class II circuit be interconnected with any other circuit.Thermostat heat anticipator settings are indicated for eachpermitted zone module connection arrangement illustratedin Fig. 11-28.To Join Modules of the Same Nest Into the Same Zone (i.e.,modules no. 1 and 2) — Install field-supplied jumpers onthermostat connections (screw terminals) Y to Y and W2 toW2 as shown in Fig. 11. Connect thermostat wires to ter-minal connections of first module in zone (for consistency).Two-stage cooling may be obtained in this example as shownin Fig. 12 (using a 2-stage thermostat).To Join Modules Not of the Same Nest Into the Same Zone(i.e., modules no. 2 and 3) — Install the factory-supplied jump-ers on quick-connect terminals 6 to 1, 7 to 2, and 8 to 3 asshown in Fig. 13. Note that module no. 1 is independentlycontrolled by its own thermostat (in Fig. 13).LEGENDAFS — Airflow SwitchCR — Control RelayECR — Economizer RelayECT — Economizer Outdoor-Air ThermostatGV — Gas Valve (not used on 50ME units)HC — Heater ContactorHR — Heater RelayIFC — Indoor (Evaporator) Fan ContactorLLS — Liquid Line SolenoidMC — Master CoolingMCR — Master Cooling RelayMH — Master HeatingMHR — Master Heating RelayMU — Master UnitMUR — Master Unit RelayNC — Normally ClosedNO — Normally OpenNS — Night SetbackSW — SwitchTRAN — TransformerQuick-Connect Type Terminals (for multiplexing)Screw-Type TerminalsNOTE: Twelve-zone unit shown. Eight-zone units have modules1-8 only. Ten-zone units have modules 1-10 only.Fig. 10 — Zone Control Board Component Location14