Returned to install filters racks for previously installed units. Also replaced single phase heat strips with correct 3 phase heat strips.
Maintenance not here today. He is sick. Lockbox for thermostat 2 and door to AHU2 is locked. Staff has no other keys. Tstat 2 is set to FAN on and system off. Staff reported air handler was frozen the other day. Based on CMA tech notes and staff information, tech suspects tstat was running system in cooling mode for a prolonged period of time outside of design conditions during the low outdoor temperatures. Tech recommends opening a window in the hot room during the winter or setting a minimum cooling setpoint of 72 degrees on Honeywell thermostat 2. Outdoor unit not calling for operation from tstat and no access to AHU or tstat. Tech billed for service call. Let Jeff Cupp know about situation.