2
Installation and operation manual
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DTHC-V4-2020
Table of contents
Code and regulation .................................................................................................. 3
Specifications ............................................................................................................. 4
Gas supply .................................................................................................................. 4
Gas pressure adjustments ......................................................................................... 5
Unit Dimensions ........................................................................................................ 6,7,8
Installation guidelines ................................................................................................ 9,10
Electrical control ........................................................................................................ 11
Components .............................................................................................................. 11,12,13
Flue vent and combustion air .................................................................................... 14,15,16,17
Start-up instruction ................................................................................................... 18,19
Control sequence ....................................................................................................... 20,21,22
Programmable logic controller features & I/O .......................................................... 23,24,25
Display (HMI) features ............................................................................................... 26
Run window ....................................................................................................... 27
Level 1: Air/Gas relation ................................................................................... 28
Level 1: Alarm history ........................................................................................ 29
Level 2: Fan RPM auto tuning ............................................................................ 30
Level 2: Signal supervision ................................................................................. 31
Level 2: Step timer ............................................................................................. 32
PLC alarms.................................................................................................................. 33
Flame safeguard alarms............................................................................................. 34
Flame safeguard troubleshooting ............................................................................. 35
Typical wiring diagram ............................................................................................... 36,37
Start / stop recommendations .................................................................................. 38
Condensate drain line installation
(indoor).…………………………………………………………..3
9,40,41
Heat trace condensate drain line installation (outdoor).…………..…………………………..4
2,43,44
Unit maintenance ...................................................................................................... 45
Warranty .................................................................................................................... 46
Start-up report ........................................................................................................... 47,48
The features, illustrations and description in this document were, to our
knowledge, accurate at the time they were approved for printing. We reserve
the right to change or stop offering some feature as well as stop producing a
given model without prior notice and commitment on our part
