Wiring; Multiple Boiler Wiring - Crown Boiler PHNTM080 Installation Instructions Manual

Positively assure all electrical connections are unpowered before attempting installation or
service of electrical components or connections of the boiler or building. Lock out all electrical
boxes with padlock once power is turned off.
All wiring and grounding must be done in accordance with the authority having jurisdiction

or, in the absence of such requirements, with the National Electrical Code /NFPA 70). In
Canada, all wiring and grounding must be done in accordance with the Canadian Electrical
Code, Part 1 (CSA C22.1 - latest edition).
Failure to properly wire electrical connections to the boiler may result in serious physical

harm.
Electrical power may be supplied from more than one circuit. Make sure all power is off

before attempting any electrical work.
Each boiler must be protected with a properly sized over-current device.

Never jump out or make inoperative any safety or operating controls.

The wiring diagrams contained in this manual are for reference purposes only. Each boiler

is shipped with a wiring diagram attached to the front door. Refer to this diagram and the
wiring diagram of any controls used with the boiler. Read, understand and follow all wiring
instructions supplied with the controls.
Install over-current protection in accordance with the authority having jurisdiction or, in the absence of such requirements, follow
the National Electric Code, NFPA 70, and/or Canadian Electrical Code Part 1, CSA C22.1. Do not provide overcurrent protec-
tion greater than 15 amperes. If this single 15A circuit is insufficient for the combined load of all boilers and pumps, provide ad-
ditional 15A circuits and divide the boilers among them. Follow the instructions in Section X of the Phantom 80-180 Installation
manual with the following exceptions:
One, and only one, of the boilers must be designated as the "Master". This boiler manages demands for heat (and sometimes
DHW). Any boiler can be designated as the Master, but field wiring to the Master is different from that for the other boilers
("Slaves"), so the Master must be chosen before the system is wired. Note that the "Master" boiler is not necessarily the same as
the "Lead" boiler. (i.e. the first boiler to fire upon a call for heat).
See typical field wiring in Figure 5.1. Key points are:
1) System pump (s) must be connected to the Master. If this will result in a combined pump draw at the Master in excess of 6.3A,
use an isolation relay between the Master's system pump terminals and the pump(s). System pump terminals on Slaves are not
used.
2) The heating thermostat is connected the "Heat T'Stat" (or Enviracom thermostat) terminals on the Master as shown. Heating
thermostat connections on the Slaves are not used.
3) If an indirect water heater is used, connect the indirect water heater thermostat to the "DHW T'Stat" terminals on the Master.
Also connect the indirect water heater pump to the "DHW Pump" terminals on the Master.
V. WIRING
DANGER
WARNING
A. MULTIPLE BOILER WIRING
14