Raypak Hi Delta 992B-1262B User Manual download pdf (Page 22)

9. Install a coupling, nipple, union and sediment trap

onto the right-hand end of the main gas line and

then install the gas line, making sure that a manu-

al shut-off valve has been installed within 10 ft of

the heater.

10. Replace the left and right front panels on the

heater.

Gas Supply Pressure

A minimum of 5.0 in. WC and a maximum of 10.5 in.

WC upstream gas pressure is required under load and

no-load conditions for natural gas. A minimum of 11.0

in. WC and a maximum of 13.0 in. WC is required for

propane gas. The gas pressure regulator(s) supplied

on the heater is for low-pressure service. If upstream

pressure exceeds 14.0 in. WC, an intermediate gas

pressure regulator, of the lockup type, must be

installed.

When connecting additional gas utilization equipment

to the gas piping system, the existing piping must be

checked to determine if it has adequate capacity for

the combined load.

The gas valve pressure regulator(s) on the heater are

nominally preset at 3.5 in. WC for natural gas, and

10.5 in. WC for propane gas. The pressure at the gas

valve outlet tap, measured with a manometer, while in

operation should be 3.5 ± 0.1 in. WC for natural gas

and 10.5 in. ± 0.1 in. WC for propane gas. If an adjust-

ment is needed, remove the adjustment screw cover

and turn the adjustment screw clockwise to increase

pressure or counter-clockwise to lower pressure.

Fig. 17: Gas Valves

Electrical Power Connections

Installations must follow these codes:

• National Electrical Code and any other national,

state, provincial or local codes or regulations hav-

ing jurisdiction.

• Safety wiring must be NEC Class 1.

• Heater must be electrically grounded as required

by the NEC.

• In Canada, CSA C22. 1 C.E.C. Part 1.

The heater is wired for 120 VAC, <12 amps. The volt-

age is indicated on the tie-in leads. Consult the wiring

diagram shipped with the heater in the instruction

packet. The remote tank control stat, thermostat, or

electronic heater control (as applicable) may be con-

nected to the stage selector terminal (See wiring

diagram). 24 VAC is supplied to this connection

through the heater transformer. DO NOT attach any

voltage to the stage selector terminals. Before

starting the heater check to ensure proper voltage to

the heater and pump.

Install a separate disconnect means for each load.

Use appropriately sized wire as defined by NEC, CSA

and/or local code. All primary wiring should be 125% of

minimum rating.

If any of the original wire as supplied with the heater

must be replaced, it must be replaced with 105°C wire

or its equivalent.

Field-Connected Controllers

It is strongly recommended that all individually-pow-

ered control modules and the heater should be

supplied from the same power source.

Check the Power Source

NOTE: Field-supplied isolation relays should be

installed when field-connected controllers are

mounted more than 50 equivalent feet (18 Ga) from

heater.

WARNING: Using a multi-meter, check the

following voltages at the terminal block inside the

unit. Make sure proper polarity is followed and house

ground is proven. (See Fig. 18.)

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 65 66

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Raypak Hi Delta 992B-1262B User Manual Page 22

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