Camus Hydronics VTech 0080, Инструкция по установке и обслуживанию

Страница: 24 / 49

21
Part 6 – Electrical
*** See electrical schematics in Appendix B ***
The appliance, when installed, must be electrically grounded in
accordance with the requirements of the authority having
jurisdiction or in the absence of such requirements, with the latest
edition of the National Electrical Code ANSI/NFPA No. 70. When
the unit is installed in Canada, it must conform to the Canadian
Electrical Code, C22.1, Part 1 and/or local Electrical Codes.
All wiring between the appliance and field installed devices shall
be made with wire having minimum 220ºF (105ºC) rating. Line
voltage wire external to the appliance must be enclosed in
approved conduit or approved metal clad cable.
To avoid serious damage, DO NOT ENERGIZE the appliance
until the system is full of water. Ensure that all air is removed from
the pump housing and piping before beginning initial operation.
Provide the appliance with proper overload protection
WARNING
THIS PRODUCT MUST BE PROPERLY GROUNDED
BEFORE ANY ELECTRIC CURRENT IS APPLIED TO THE
BLOWER OR CONTROLS!
WARNING
The voltage output from the variable frequency drive to the
combustion air fan is 230VAC, 3 Phase.
AVOID contact with
high voltage wiring
This appliance uses a transformer to supply a low voltage control
circuit. The voltage on the secondary side should be 24 to 28VAC
when measured with a voltmeter. A secondary voltage of 21VAC
or less supplied to 24VAC components may cause operational
problems. A 4A circuit breaker is provided on the secondary side
of the transformer. A tripped circuit breaker indicates a short in
the 24VAC controls and must be corrected.
6.1
– Blower Motors
The VTech uses a 120V/1PH electrical supply to power a DC
motor on the blower motor. On ignition, after safety checks are
complete, the blower is provided with a signal to operate at soft
start level for burner ignition. After main burner ignition is
established, the motor receives a modulating signal from the
control corresponding to the rate of modulation necessary.
6.2
– Ignition Control
All models use the same 120VAC/1PH electrical supply used to
power blower to provide voltage for the ignition circuit, including
the hot surface igniter.
The VTech operates with a Fenwal Platform Ignition Module
(PIM) to control firing rates from 20% - 100%. It is equipped with
the latest flame supervision, combustion air blower control, DHW
control and hot surface ignition technology. This allows for more
efficient water heater operation, reduced operating costs,
reduced emissions and improved load control.
The operation of
the VTech c ontroller proves the presence of main flame using a
flame sensor proof current (0.8µA). A status of Ignition Failed will
be displayed on the main panel if the water heater fails to light
after three (3) consecutive ignition attempts.
The VTech
controller is an electronic proportional integrated combination
ignition limit/operator control accurate to 1°F and is equipped
with a PWM output signal suitable for control of a variable
frequency motor drive for modulating fan speeds.
Each appliance has one ignition module, one hot surface igniter
and one flame sensor. These parts are not repairable, a faulty
ignition module or hot surface ignitor
MUST be replaced with a
new factory part. DO NOT use general purpose field replacement
parts. Any modification or repairs will invalidate the warranty and
may create hazardous conditions that result in property damage,
personal injury, fire, explosion and/or toxic gases.
Fenwal Platform Ignition Module
Table 5: Ignition Module Connector Description
Connector Connector Description
J1
LWCO, Alarm Contacts
J2
Not used
J3
Not used
J4
Ethernet connection to BTCII display
J5
Not used
J6
VTech ID Card
J7
Outlet Sensor/ High limit
J8
Blocked flue, low air proving switch
J9
Inlet sensor, stack sensor
J10
PWM signal to combustion air blower
J11
24Vac power
J12
24Vac gas valve
J13
Not used
J14
115Vac incoming power for HSI
P1
115Vac to HSI
The ignition module has a manual reset button to recycle the
control. Pushing the reset button is the only way to reset an
ignition module that is in lockout.
Turning the main power “OFF”
and then “ON” will not reset a lockout condition.