Modine Manufacturing 6-558.6 - Manual (Page 8)

INSTALLATION
8
6. Provide a drip pocket before each unit and in the line where
low spots cannot be avoided. (See Figure 7).
7. Take-off to unit should come fro top or side of main to avoid
trapping condensate.
8. Piping, subject to wide temperature variations, should be
insulated.
9. Pitch piping up toward unit at least 1/4" per 15' of horizontal
run.
10. Compounds used on threaded joints of gas piping must be
resistant to action of liquefied petroleum gases.
11. Purge air before lighting unit by disconnecting pilot tubing at
combination gas control. In no case should line be purged
into heat exchanger.
12. After installation, check system for gas leaks, using a soap
solution.
13. Install a ground joint union and a manual shut off valve
immediately upstream of the unit including a 1/8" NPT
plugged tapping accessible for test gage connection. (See
Figure 7).
14. Allow at least 5 feet of piping between any high pressure
regulator and unit control string.
15. When Pressure/Leak testing, pressures above 14'' W.C. (1/2
psi), close the field installed shut-off valve, disconnect the
appliance and its combination gas control from the gas
supply line, and plug the supply line before testing. When
testing pressures 14" W.C. (1/2 psi) or below, close the
manual shut-off valve on the appliance before testing.
Wiring General
All field installed wiring must be done in accordance with the
National Electrical Code ANSI/NFPA 70 — Latest Edition or
Canadian Electrical Code CSA C22.1 Part 1 or local codes.
Unit must be electrically grounded according to these codes.
See wiring diagram shipped with unit. For optional wiring
diagrams see Bulletin 6-453.
The power to these units should be protected with a fused
disconnect. Units for use with three-phase electric power must
be provided with a motor starter having properly sized overload
protection.
Location of thermostat should be determined by heating
requirements and be mounted on an inside wall about 5' above
floor level . . . where it will not be affected by heat from the unit
or other sources, or drafts from frequently opened doors. See
instructions packed with thermostat.
Installation of Blower Models (BSH Units)
Attachment of Field Installed Ductwork,
Blower BSH Models Only
Burned-out heat exchanger and shorter equipment life will
result from not providing uniform air distribution.
When installing unit, always follow good duct design practices
for even distribution of the air across the heat exchanger.
Recommended layouts are shown below. When installing blower
units with ductwork, the following must be done.
1. Provide uniform air distribution over the heat exchanger.
Use turning vanes where required. See figures below.
2. Provide removable access panels in the ductwork on the
downstream side of the unit. These openings should be
large enough to view smoke or reflect light inside the casing
to indicate leaks in the heat exchanger and to check for hot
spots on exchanger due to poor air distribution or lack of
sufficient air (cfm).
3. If ductwork is connected to the rear of the unit, use Modine
blower enclosure kit, or if using field designed enclosure,
maintain dimensions of proper blower enclosure as shown.
on page 19.
Installation of Blower Units (BSH)
Determining Blower Speed
The drive assembly and fan motor on all gas-fired blower units
are factory assembled. The adjustable motor sheave has been
pre-set to obtain maximum air flow without any external static
pressure. The motor sheave should be adjusted as required
when the unit is to be operated at other air flows and/or with
external static pressures. Adjustment must always be within the
performance range shown on pages 14 and 15 and the
temperature rise range shown on the unit’s rating plate.
To determine the proper blower speed and motor shave turns
open, the conditions under which the unit is to operate must be
know. If the blower unit is to be used without duct work, nozzles
or filters, the only criteria for determining the motor sheave
turns open and blower speed is the amount of air flow to be
delivered. The performance tables for blower models are shown
on pages 14 and 15. As an example, a model BSH150 unit
GAS
SUPPLY LINE
GAS
SUPPLY LINE
GROUND
JOINT
UNION
3"
MIN.
DRIP
POCKET
PLUGGED
1/8" NPT TEST
GAGE CONNECTION
TO
CONTROLS
A manual shut off valve with
1/8' N.P.T. plugged tapping,
accessible for test gage
connection must be installed
immediately upstream of the
gas supply connection to the
appliance.
Figure 7
Recommended Piping to Controls
CAUTION
Disconnect power supply before making wiring connections to
prevent electrical shock and equipment damage. ALL UNITS
MUST BE WIRED STRICTLY IN ACCORDANCE WITH
WIRING DIAGRAM FURNISHED WITH UNIT.
ANY WIRING DIFFERENT FROM WIRING DIAGRAM MAY BE
HAZARDOUS TO PERSONS AND PROPERTY.
Any damage to or failure of Modine units caused by incorrect
wiring of the units is not covered by MODINE’S STANDARD
WARRANTY (see Back Cover).
CAUTION
Proper air flow and distribution, across the hat exchanger must
be provided to prevent early failure of the blower unit heater.
CAUTION
Do not attempt to attach ductwork of any kind to propeller PSH
models.
CAUTION
Check for red heat exchanger tubes. If bottom of tubes become
red while blower unit is in operation, check for proper air volume
and air distribution. Adjust blower speed or correct discharge
duct design to correct problem.
Heater Parts from ACF Greenhouses