Roberts Gorden CORAYVAC Installation Manual Download

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SECTION 7: C

OMMISSIONING

CORAYVAC

YSTEM

SECTION 7: COMMISSIONING THE CORAYVAC

SYSTEM

Note:

The ROBERTS GORDON

CORAYVAC

Mod-

ulating Heating Control central controller is fitted with
a touchscreen for communication to the CORAY-

VAC® system and all CORAYVAC® Modulating

Heating Control satellite controllers (maximum of 31
controllers before a repeater is needed). All wiring
and control board setup must be complete prior to
commissioning the system.

7.1 Setting The CORAYVAC

End Burner Vacuum

It is important to understand that the frequency that
the VFD runs the motor at, determines the speed of
the impeller in the pump. Variation of the impeller
speed will increase or decrease vacuum in the sys-
tem. The following procedure will help you set mini-
mum and maximum VFD frequency settings to
achieve proper vacuum in the system.

Step 7.1.1 Note:

The VFD(s) should be programmed

using the procedure and parameters described on

Page 48, Section 6

through Page 49, Section 6.2

prior to this step. At the VFD, press and hold "OK"
until P-01 appears. This will allow access to the PRO-
GRAM mode to adjust parameters. Using the arrow
button, scroll to P-12 and set parameter to "01". Press
"OK" to store new setting. Press "START" button on

VFD to turn on the CORAYVAC® vacuum pump.

Pump should ramp up to value set in P-01. Verify
pump rotation. Pump impeller should be rotating in
direction of arrow stamped on vacuum pump hous-
ing.

On the control board, switch the relevant "HOA"
switches to "Manual On" position to turn on the zones
connected to the vacuum pump.

See Page 14, Figure

for control board layout.

Note:

The vacuum pump must be energized prior to

manually switching on the zones.

Step 7.1.2

The pump should be running and the burn-

ers should light within 60 seconds. At the VFD, verify
that the number displayed on the LCD screen is
"60.0" If it is lower than 60.0, hit the "up" arrow button
on the VFD until the number reads 60.0 Let the burn-
ers fire for approximately 20-30 minutes to warm up
the system. Using a manometer, check the end vent
vacuum in each zone (each branch of burners).

See

Page 56, Figure 24

If the lowest end vent vacuum reading is above 3.0"
w.c., reduce the vacuum pump speed. Generally, the

lowest end vent vacuum reading is on the longest
branch of the system. Use the down arrow button on
the VFD to reduce the frequency of the output signal
to the pump, thus reducing the pump speed and low-
ering the end vent vacuum reading. Continue to
reduce the frequency until the end vent vacuum read-
ing is between 2.5" - 3.0" w.c. Make note of this fre-
quency setting below. The frequency is found on the

VFD’s LCD screen.

2.5" w.c. - 3.0" w.c. VFD Frequency Setting

To avoid damage to the pump motor, do not adjust

the frequency above 60.0 Hz. Verify that the end vent
vacuum readings in the remaining branches are
proper. If necessary, adjust the proper damper cou-
pling to achieve an end vent vacuum of 2.5" - 3.0"
w.c.

See Page 56, Figure 24

. Damper couplings

should be found near the end of the radiant portion of
the pipe in each branch or where a branch connects
to other branches at a cross or tee.

See Page 57, Fig-

ure 25

Step 7.1.3

After setting end vent vacuums between

2.5" w.c. and 3.0" w.c., while all the burners are still
operating, use the down arrow button on the VFD to
reduce the frequency of the output signal to the
pump. Reduce the frequency of the VFD until the
manometer at each of the end vents reads 1.2" w.c. -
1.5" w.c., Make note of this frequency setting below.

The frequency is found on the VFD’s LCD screen.

1.2" w.c. - 1.5" w.c. VFD Frequency Setting

Step 7.1.4

Press the "STOP" button on VFD. Return

"HOA" switches to "Auto".

Step 7.1.5

Using the procedure described on

Page

48, Section 6

, alter parameters "P-01" and "P-02" to

maximum and minimum frequency settings. Return
parameter "P-12" to "03".

Record Frequency Setting Here: