Technical information

4
13.15.- Copper fin coils 27
13.16.- “Blue Fin” coils 27
13.17.- Mounting base (Roof Curb), fixed 27
13.18.- Mounting base (Roof Curb), adjustable 27 - 29
14 - Pulley adjustment and belt tensing
30
15 - DPC-1 programmable digital thermostat
with communication 31
15.1.- Air conditioning modes 31
15.2.- Key functions 32
16 - Operation 32
16.1.- Cooling system 32
16.2.- Preliminary cooling operation 32
16.3.- Thermostat operation 32
16.4.- Cooling operation sequence 32
16.5.- Heat operation sequence with gas
(models D4IC) 33
16.6.- Heat operation sequence with electric heaters
(models D4IC) 33
16.7.- Heat operation sequence with heat pump
(models B4IH) with electric heaters
(optional) 33
16.8.- Defrost sequence (models B4IH) 33 - 34
17 - Safety features and controls
34
17.1.- Cooling lockout 34
17.2.- Gas heating lockout (models D4IG) 34
17.3.- Low gas pressure (models D4IG) 35
17.4.- Heating lockout (electric heaters) 35
17.5.- Motor overload protection 35
18 - Start-up gas heating, models D4IG 35
18.1.- Check list prior to start-up 35
18.2.- Turning on 35
18.3.- Start-up, without YKTOOL portable test tool
(accessory) 35
18.4.- Start-up, with YKTOOL (accessory) 35
18.5.- Check list after start-up 35 - 36
18.6.- Adjustment gas valves/thermal
switches 37
18.7.- Adjustment gas pressure at burner
feed manifold 38
18.8.- Gas consumption 37
19 - Maintenance 38
19.1.- General 38 - 40
19.2.- Gas heating units, D4IG 41
19.3.- Burner and injector inspection instructions 41
19.4.- Cleaning heat exchanger 42
20 - Wiring diagrams 43
20.1.- Cool only models D4IC and D4IG-360 43 - 45
20.2.- Cool only models D4IC-480 46 - 48
20.3.- Heat pump models B4IH-360 49 - 51
20.4.- Heat pump models B4IH-480 52 - 54
20.5.- Cool only + gas heating models D4IG-360 55 - 58
20.6.- Cool only + gas heating models D4IG-480 59 - 62
Configuration of switches 63
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