Orion System MHGRV II - Manual (Page 8)

Technical Guide
MHGRVII Controller 8
Start-up & Commissioning
General
In order to have a trouble free start-up it is important to follow a few
simple procedures. Before applying power for the fi rst time it is very
important to run through a few simple checks.
Power Wiring
One of the most important checks to make before powering up the system
for the fi rst time, is to confi rm proper voltage and transformer sizing
for the controller. Each MHGRV II controller requires 40 VA of power
delivered to it at 24 VAC.
Check all wiring leads at the terminal block for tightness. Be sure that
wire strands do not stick out and touch adjacent terminals. Confi rm that
all sensors required for your system are mounted in the appropriate loca-
tion and wired into the correct terminals on the MHGRV II controller.
After all the above wiring checks are complete, apply power to the
MHGRV II controller.
Power Up And Operation
The MHGRV II Controller uses an on board LED to indicate various
diagnostic conditions during power-up and operation. The LED is labeled
“STATUS”. Starting with power up the LED blink codes are as follows:
 
One Blink

Off for fi ve seconds
 
Blinks 30 times

Blinks 3 times rapidly

Status code is repeatedly blinked every ten seconds to
indicate controller status
See the Troubleshooting section of this manual for LED diagnostic
code information.
Programming The Controller
Stand-Alone
If the MHGRV II is used as a stand-alone controller it does not require
programming. It does require the Supply Air Temperature SETPOINT
DIP Switch and the RESET LIMIT DIP Switch (if required) be correctly
set for the required Supply Air Temperature and the Supply Air Reset
Temperature
When Used With A HVAC Unit Controller
When the MHGRV II controller is connected to a HVAC Unit controller,
the HVAC unit controller must be programmed with the desired Supply
Air temperature Setpoint and Supply Air Temperature Reset Setpoint and
other confi guration information. In order to confi gure and program the
HVAC unit controller you must have a central operators interface or a
personal computer with the Prism computer front end software installed.
Two different operators interfaces are available for programming of the
HVAC unit controller. You may use either the Modular Service Tool
or the Modular System Manager to access the status and setpoints of
the HVAC unit controller See the Modular Service Tool and System
Manager Programming guide for programming information. If you are
going to use a personal computer and the Prism computer front end soft-
ware, please refer to the Orion Prism Technical Guide. No matter which
operators interface you use, it is recommended that you proceed with
the programming and setup of the controller in the order that follows:
1. Confi gure The Controller For Your Application

2. Program The Controller Setpoints.

3. Review Controller Status Screens To Verify System
Operation And Correct Controller Confi guration
Mode
Selection
ENTER
CLEAR ESC
PREV NEXT
DOWN
UP
6 5 4
DEC
7
0
8
1 3 2
9
MINUS
-
STATUS
SETPOINTS
SCHEDULES
CONFIGURATION
ALARMS
ON
OVERRIDES
BALANCE - TEST
ENTER
CLEAR ESC
PREV NEXT
DOWN
UP
6 5 4
DEC
7
0
8
1 3 2
9
MINUS
-
STATUS
SETPOINTS
SCHEDULES
ALARMS
OVERRIDES
System Manager
Figure 5: Operators Interfaces