HVACopediaGlow Brand · Boiler · Domestic hot water
Indirect tank call and priority
What happens, in order
- DHW mode 1 uses an indirect tank with a sensor (mode 0 default = no DHW)
- Tank sensor drops below the DHW setpoint (2.115) and the boiler fires and modulates to it
- 120 V goes to the DHW pump terminals 15 and 16 while serving the tank
- If CH and DHW are called together, DHW priority mode (2.042) decides: 0 = timed swap using 2.043, 1 = CH always first, 2 = DHW always first
- With mode 0 the boiler swaps between CH and DHW each time the priority time runs out
Timings and thresholds
| Item | Value |
|---|---|
| DHW priority time | parameter 2.043 |
| Pump load limit | 2.0 A on primary and DHW pump terminals |
Applies to: B85, B120, B160
Models
More Glow Brand boiler sequences
- Power-up and de-air · Startup
- Ignition and retry · Ignition
- Central heat call and post purge · Heating
- Anti-frost pre-heat · Freeze protection
- Anti-legionella cycle · Other
Take it to the job
Sequences of operation, error codes and tips work offline in the HVACopedia app.
Source: Glow Brand B85/B120/B160 Installation and Operating Manual (sections 10.2, 11.7, 11.8, 11.10, 12.1). Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.