Installation / Operation Instruction Manual

Page 42
WARNING
Electrical Shock Hazard
Electrical shock can cause severe injury, death or
property damage. Disconnect the power supply
before beginning installation or changing the
wiring to prevent electrical shock or damage to the
equipment. It may be necessary to turn o󰀨 more
than one power supply disconnect.
All electrical wiring is to be done in accordance with
local codes, or in the absence of local codes, with:
1) The National Electrical Code ANSI/NFPA No. 70
- latest Edition, or
2) CSA STD. C22.1 “Canadian Electrical Code -
Part 1.” This unit must be electrically grounded in
accordance with these codes.
AVERTISSEMENT
Risque de choc électrique un choc électrique peut
provoquer des blessures graves, la mort ou des
dommages matériels. Débrancher l’alimentation
électrique avant de commencer l’installation ou
la modication du branchement pour éviter tout
choc électrique ou d’endommager l’équipement.
Il peut être nécessaire de désactiver plusieurs
alimentations débrancher. Tout le câblage
électrique doit être fait en conformité avec les
codes locaux, ou en l’absence de codes locaux,
avec : 1) Le National Electrical Code ANSI/NFPA
no 70 - Dernière édition, ou 2) CSA STD.
NOTE: When running the Power and Field
Connection wires (Lead Lag, System Sensor,
Outdoor Sensor, Building Automation, etc.), it
is helpful to exit and enter the units through the
lower back panels so that during future servicing,
the wires do not interfere with the removal of the
panels.
AVIS: Lors de l’exécution de la puissance et des
câbles de raccordement (câble de capteur du
système, Lag, capteur Extérieur, domotique, etc.), il
est utile pour sortir et entrer dans les unités à travers
la partie inférieure arrière de sorte qu’au cours
de l’entretien futur, les ls n’interfèrent pas avec
l’enlèvement des panneaux.
7.E.5 Isolation Valve
If an optional boiler water isolation valve is purchased
from Mfgr
, Terminals 31, 32, and 45 to 48 are used to
open, close and monitor the position of the valve.
These terminals are pre-wired with a cable that termi-
nates with an 8 pin connector at the rear of the boiler.
The optional isolation valve, which is ordered separate-
ly, is wired with the mating cable and connector for easy
field installation. This valve is used to prevent water flow
through the boiler when the boiler is not in use, see
8.D.10.h on page 95 for operational details.
7.E.6 Heat Demands
TT1 - If a thermostat/aquastat or end switch (isolated
contact only) is used as a heat demand, connect to
terminals 49 and 50 (See Figure 20 on page 40).
TT1 functionality is congured on the touch screen on
the CH1/DHW1 screens.
TT2 – If an additional thermostat/aquastat or end switch
(isolated contact only) is required as a heat demand,
connect to terminals 51 and 52. TT2 functionality is
congured on the touch screen on CH2/DHW2 screens.
DHW – If an aquastat, end switch (isolated contact
only), or ow switch is used as a DHW heat demand,
connect to terminals 53 and 54. If preferred, a DHW
tank sensor can be used in lieu of an aquastat to
generate a heat demand.
NOTE: TT1, TT2, and DHW heat demand contacts must
be dry contacts. The controllers heat demand voltage is
24VDC.
Refer to CH1 in 8.G on page 104– Active Demands.
7.E.7 Analog In and Analog Out
Analog In – If an analog input (0-10VDC or 4-20mA)
from a BMS is used as a remote set point or remote
ring rate command, wire to terminals 55 and 56 (See
Figure 20 on page 40). Polarity is shown on the
terminal label. Selecting voltage or current input is
accomplished through jumper placement on the control
board. Analog BMS functionality is congured using the
touch screen.
Analog Out – When using Vari-Prime pump control,
wire the pump speed wires to terminals 47 and 48.
Polarity is shown on the terminal label. Selecting
voltage or current output is accomplished through
jumper placement on the control board. Vari-Prime
functionality is congured using the touch screen.
7.E.8 Dry Contacts. Run & Alarm
Run - When used, is connected to terminals 59
(common), 60 (normally closed), and 61 (normally open)
(See Figure 20 on page 40). The controller closes
the normally open set of contacts whenever the unit is
running. Contact ratings are 250VAC, 0.6A maximum.
Alarm - When used, is connected to terminals 63
(common), 63 (normally closed), and 64 (normally
open). The controller closes the normally open set of
contacts whenever the unit is locked out. Contact ratings
are 250VAC, 0.6A maximum.