Inspected all units for proper heat operation. Inspected each units blowers and documented amp draws and voltages. Found all units to be running properly. Job complete.
Up on arrival performed fall maintenance on 11/07/2019. Checked thermostat for operation, checked unit for operation, took readings of electrical components, took delta T , delta P , cleaned drain line, changed air filter
Up on arrival performed fall maintenance on 10/31/2019. Checked thermostat for operation, checked unit for operation. Customer changed air ( 28x20x2 ) 30 minutes before I got there . Took delta P, delta T . Took readings of electrical components. Unit working good at this time.
Relocated thermostat for unit 2 to the hallway (back side of wall of exam room 5). Did so because of large temperature difference in exam room where thermostat was located and hallway. Found a 3 degree difference between the 2 spaces. Used thumb gum to seal backside of wall where hole penetration was. Also moved hand washing sign over hole in the wall so it isn’t noticeable. Once thermostat was relocated I tested system and checked operation. Went into installer settings and made sure they were correct. Unit operating normal at this time.
Unit is flat with 410a, perform leak search and repair if possible for circuit 1. (5lb 12oz 410a). Performed leak search and repair. Added 400psi of nitrogen to system and found leak at low pressure switch pipe. Used torch to heat up extension pipe then removed it entirely. Cleaned copper on both ends then used torch and brazen rods to seal pipe to suction line. Verified no leaks with 400psi of nitrogen. Removed nitrogen and vacuumed system down to 500micron and held. Added factory charge of 92 oz of 410a and tested unit. Normal pressures, temps, and amperages. Unit operating normal.
Performed Operational Inspection for both RTUs. Replaced all filters. Flushed out drains. Inspected cleanliness of blowers and coils. Checked tension of belts. Checked capacitors and contactors. Tightened electrical connections. Ran ac on both systems. Checked operation of both stages, measured amp draw and delta air temps. Found Circuit 1 on Unit 2 flat. Quoting customer to perform leak search and repair, 5lb 12oz 410a per Circuit. Customer also explained that they feel temperature and humidity difference between rooms. Thermostat is in Exam room 5 and they keep door closed mostly. Quoting customer to relocate thermostat right outside of door on other side of wall or to add temperature sensor and mount that in hallway.
Upon arrival found back hallway hot and humid. Called for cooling from thermostat and inspected rtu. Found system cooling properly with no alerts on control board. Thermostat mounted in exam room #5 where door is normally closed. System is running until room temperature is satisfied but not until hallway temperature is satisfied. Thermostat is Honeywell 8000, possible option to install sensor to thermostat and mounting in hallway. Unfortunately, if we did this then exam rooms would be much colder in summer and hotter in winter since the system would run until hallway, much larger space, is cooled or heated. Right now I advised employees a way to help regulate temperature is to have exam room #5 door propped open, this way the hotter air would enter the room and be picked up by thermostat.
On arrival set thermostat to call for cooling. Measured return temperature, supply temperature, amps, and voltage. Measured EWT,LWT,EWP, and LWP. I found water loop low on water pressure. Pressurized system to 70psi. Inspected electrical connections, contactor, replaced filter provided by customer, blower wheel is clea, evaporator coil is clean, cleaned condensate pan as well as the condensate drain line, and tested condensate pump. I noticed a lot of dust on the filter so I created and stimate for a duct cleaning. I also created an stimate for a wet switch. Customer was on a phone meeting so I couldn’t explained the benefits of installing a wet switch and duct cleaning. But I will email him the information. Unit is operating normal at this time.
Called customer to tell him I would be there in around an hour customer would wife would like to pick diverter out anyway customer will call in when diverter are on site to get just labor estimate and installation
On arrival checked thermostat was calling for cooling. Measure EWT, LWT, EWP, LWP, delta P, delta T, return, and supply air Temperature. Measure amps,voltage, inspected contactor,voltage absorption system rated for 40, actual 40.1, filter is clean(28x30x2), blower wheel is clean as well as the evaporator coil. Checked operation and system is running correctly.
Performed maintenece on both rooftop units. Cleaned flame sensors. Ohmed igniters. Inspected heat exchangers, blowers, and coils. Checked capacitors and contactors. Tightened electrical connections. Replaced filters and belts. Ran heat and checked operation. Measured heat rise and amp draw. Let systems satisfy thermostat. Both units operating normal at this time.
