1871 ROSS AVE VERIZON ANTENNA 2018-01-04

. ' � • outdoor defrost thermostat closes. (This thermostat is � � � � _ , located on a coil tube.) When the thermostat closes, the timer on the defrost control starts accumulating the A 3/4" drain hose is located on the bottom side of the unit. The compressor run time. After the selected time (30, 60,or 90 drain may be extended for condensate removal to compiy with minutes) has been accumulated, the controller will start the local codes (use fitting size or larger). Install a condensate trap defrost cycle regardless of the outside temperature. During on this line. the defrost cycle, the system is switched back into the cooling mode by the control de-energizing the reversing � valve solenoid. The N/C pole of the control fan relay is opened, turning off the outdoor fan to allow the outdoor coil Electric heat is an option on T Series units and can be field- to be warmed (defrosted) faster. The defrost control installed on either single-or three-phase models. energizes the indoor auxiliary heat relays through the E terminal to temper the indoor supply air. This terminal should Refer to the individual installation instructions for installing heat be connected to E (second-stage heat) on the thermostat. kits. � - � After the defrost thermostat reaches 65°F ±5°F, the defrost cycle will end. The control will not allow the defrost to Eubank wallmount air conditioners and heat pumps have the continue longer than 10 minutes. ability to equip a variety of options: Electric Heat 5-20kW DEFROST TIME SELECTION Energy Recovery Ventilator The defrost control has three selectable time intervals: 30, Sound Attenuation Module 60 and 90 minutes. The timing is factory set at 60 minutes. Powered Ventilation Damper This timing has been determined by testing to provide the Low Ambient Packages best operating efficiency. In areas where the humidity is Economizer lower than normal, the timer may be set to a higher time (90 Lead Lag Controllers minutes). To change the time, move the timer jumper to the Option kits must be installed according to the respective postmarked 30 for 30 minutes, 60 for 60 minutes, or 90 for installation manual to ensure safe and reliable operation. Installation manuals are included with the option kit or can be 90 minutes. found on the Eubank website,www.EubankNCC.com. DEFROST TEST POST : � � • • � • The defrost control has test posts to speed up the defrost time setting by a factor of 256. COOLING MODE If you want to initiate a defrost without waiting for the time to Low-voltage thermostat terminal R is connected to Y, O, and accumulate, you can jumper the two test pins (marked test). G, at the unit low-voltage terminal board. If the coil temperature is above 30°F you will need to jumper the DFT (defrost thermostat) terminals to simulate a closed The system reversing valve is energized during the cooling thermostat. The defrost cycle should occur in 7 seconds for mode. Power is supplied to the reversing valve solenoid a 30-minute setting, 14 seconds for a 60-minute setting, and through the low-voltage O terminal. The low-voltage Y 17 seconds for an 90-minute setting. If the jumper is terminal to the control will energize the contactor latch coil removed immediately when the defrost cycle starts,the cycle (causing the contactor to energize the compressor). The low- will end if the defrost thermostat is opened (coil above 65°F). voltage Y terminal to the control will also energize the If the test pins remain jumped, and the defrost thermostat is control's timer. During the cooling mode, the defrost closed, the defrost will end in 2.3 seconds, which is the 10- thermostat is open (coil temperature is above 30°F) and will minute default. not allow the time to be accumulated to initiate the defrost mode. The outdoor fan is wired through the N/C points of the DURING THE ABOVE TEST, DO NOT CONTACT OR control's relay and the N/O points of the contactor. The fan SHORT ANY OTHER PIN. THIS MAY DAMAGE THE motor will be energized whenever the contactor is energized CONTROL. (except during defrost). • - • • HEATING MODE FIELD CHARGING Low-voltage terminal R is connected to Y and G, at the unit Compared to a cooling-only unit, a heat pump is difficult to low-voltage terminal board. field charge correctly without the use of charging scales. It is The system reversing valve is not powered during the recommended the charge be weighed in with an accurate heating mode. With the thermostat system switch turned to charging scale. The correct charge weight can be found on heat. The Y terminal will energize the compressor, outdoor the unit name plate. fan, and the indoor blower. H Series units are equipped with a high-pressure switch. DEFROST MODE This switch is wired through a lockout relay to lock out the system if the high side pressure exceeds 650 psi. The high side pressure MUST be below 450 psi before the system To prevent ice build-up on the coil during the heating mode, can be reset. as the outdoor coil temperature falls below 30°F ±5°F, an REV. 3/13/14 c" 3090013 l.�'1 u -•�_._,,--